First Sagittarius A* Event Horizon Telescope Results. VI. Testing the Black Hole Metric

Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Bach, Uwe; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, John; Bauböck, Michi; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwaer, Thomas; Bustamante, Sandra; Byun, Do-Young; Carlstrom, John E.; Ceccobello, Chiara; Chael, Andrew; Chan, Chi-kwan; Chatterjee, Koushik; Chatterjee, Shami; Chen, Ming-Tang; Chen, Yongjun; Cheng, Xiaopeng; Cho, Ilje; Christian, Pierre; Conroy, Nicholas S.; Conway, John E.; Cordes, James M.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Dexter, Jason; Dhruv, Vedant; Doeleman, Sheperd S.; Dougal, Sean; Dzib, Sergio A.; Eatough, Ralph P.; Emami, Razieh; Falcke, Heino; Farah, Joseph; Fish, Vincent L.; Fomalont, Ed; Ford, H. Alyson; Fraga-Encinas, Raquel; Freeman, William T.; Friberg, Per; Fromm, Christian M.; Fuentes, Antonio; Galison, Peter; Gammie, Charles F.; García, Roberto; Gentaz, Olivier; Georgiev, Boris; Goddi, Ciriaco; Gold, Roman; Gómez-Ruiz, Arturo I.; Gómez, José L.; Gu, Minfeng; Gurwell, Mark; Hada, Kazuhiro; Haggard, Daryl; Haworth, Kari; Hecht, Michael H.; Hesper, Ronald; Heumann, Dirk; Ho, Luis C.; Ho, Paul; Honma, Mareki; Huang, Chih-Wei L.; Huang, Lei; Hughes, David H.; Ikeda, Shiro; Impellizzeri, C. Violette; Inoue, Makoto; Issaoun, Sara; James, David J.; Jannuzi, Buell T.; Janssen, Michael; Jeter, Britton; Jiang, Wu; Jiménez-Rosales, Alejandra; Johnson, Michael D.; Jorstad, Svetlana; Joshi, Abhishek V.; Jung, Taehyun; Karami, Mansour; Karuppusamy, Ramesh; Kawashima, Tomohisa; Keating, Garrett K.; Kettenis, Mark; Kim, Dong-Jin; Kim, Jae-Young; Kim, Jongsoo; Kim, Junhan; Kino, Motoki; Koay, Jun Yi; Kocherlakota, Prashant; Kofuji, Yutaro; Koch, Patrick M.; Koyama, Shoko; Kramer, Carsten; Kramer, Michael; Krichbaum, Thomas P.; Kuo, Cheng-Yu; Bella, Noemi La; Lauer, Tod R.; Lee, Daeyoung; Lee, Sang-Sung; Leung, Po Kin; Levis, Aviad; Li, Zhiyuan; Lico, Rocco; Lindahl, Greg; Lindqvist, Michael; Lisakov, Mikhail; Liu, Jun; Liu, Kuo; Liuzzo, Elisabetta; Lo, Wen-Ping; Lobanov, Andrei P.; Loinard, Laurent; Lonsdale, Colin J.; Lu, Ru-Sen; Mao, Jirong; Marchili, Nicola; Markoff, Sera; Marrone, Daniel P.; Marscher, Alan P.; Martí-Vidal, Iván; Matsushita, Satoki; Matthews, Lynn D.; Medeiros, Lia; Menten, Karl M.; Michalik, Daniel; Mizuno, Izumi; Mizuno, Yosuke; Moran, James M.; Moriyama, Kotaro; Moscibrodzka, Monika; Müller, Cornelia; Mus, Alejandro; Musoke, Gibwa; Myserlis, Ioannis; Nadolski, Andrew; Nagai, Hiroshi; Nagar, Neil M.; Nakamura, Masanori; Narayan, Ramesh; Narayanan, Gopal; Natarajan, Iniyan; Nathanail, Antonios; Fuentes, Santiago Navarro; Neilsen, Joey; Neri, Roberto; Ni, Chunchong; Noutsos, Aristeidis; Nowak, Michael A.; Oh, Junghwan; Okino, Hiroki; Olivares, Héctor; Ortiz-León, Gisela N.; Oyama, Tomoaki; Özel, Feryal; Palumbo, Daniel M.; Paraschos, Georgios Filippos; Park, Jongho; Parsons, Harriet; Patel, Nimesh; Pen, Ue-Li; Pesce, Dominic W.; Piétu, Vincent; Plambeck, Richard; PopStefanija, Aleksandar; Porth, Oliver; Pötzl, Felix M.; Prather, Ben; Preciado-López, Jorge A.; Psaltis, Dimitrios; Pu, Hung-Yi; Ramakrishnan, Venkatessh; Rao, Ramprasad; Rawlings, Mark G.; Raymond, Alexander W.; Rezzolla, Luciano; Ricarte, Angelo; Ripperda, Bart; Roelofs, Freek; Rogers, Alan; Ros, Eduardo; Romero-Cañizales, Cristina; Roshanineshat, Arash; Rottmann, Helge; Roy, Alan L.; Ruiz, Ignacio; Ruszczyk, Chet; Rygl, Kazi J.; Sánchez, Salvador; Sánchez-Argüelles, David; Sánchez-Portal, Miguel; Sasada, Mahito; Satapathy, Kaushik; Savolainen, Tuomas; Schloerb, F. Peter; Schonfeld, Jonathan; Schuster, Karl-Friedrich; Shao, Lijing; Shen, Zhiqiang; Small, Des; Sohn, Bong Won; SooHoo, Jason; Souccar, Kamal; Sun, He; Tazaki, Fumie; Tetarenko, Alexandra J.; Tiede, Paul; Tilanus, Remo J.; Titus, Michael; Torne, Pablo; Traianou, Efthalia; Trent, Tyler; Trippe, Sascha; Turk, Matthew; van Bemmel, Ilse; van Langevelde, Huib Jan; van Rossum, Daniel R.; Vos, Jesse; Wagner, Jan; Ward-Thompson, Derek; Wardle, John; Weintroub, Jonathan; Wex, Norbert; Wharton, Robert; Wielgus, Maciek; Wiik, Kaj; Witzel, Gunther; Wondrak, Michael F.; Wong, George N.; Wu, Qingwen; Yamaguchi, Paul; Yoon, Doosoo; Young, André; Young, Ken; Younsi, Ziri; Yuan, Feng; Yuan, Ye-Fei; Zensus, J. Anton; Zhang, Shuo; Zhao, Guang-Yao; Zhao, Shan-Shan

doi:10.3847/2041-8213/ac6756

Title: First Sagittarius A* Event Horizon Telescope Results. VI. Testing the Black Hole Metric

Journal Article · Thu May 12 00:00:00 EDT 2022 · The Astrophysical Journal. Letters

DOI:https://doi.org/10.3847/2041-8213/ac6756· OSTI ID:1868459

;

; Alef, Walter;

;

; Ball, David;

;

; Bintley, Dan;

;

Astrophysical black holes are expected to be described by the Kerr metric. This is the only stationary, vacuum, axisymmetric metric, without electromagnetic charge, that satisfies Einstein's equations and does not have pathologies outside of the event horizon. We present new constraints on potential deviations from the Kerr prediction based on 2017 EHT observations of Sagittarius A* (Sgr A*). We calibrate the relationship between the geometrically defined black hole shadow and the observed size of the ring-like images using a library that includes both Kerr and non-Kerr simulations. We use the exquisite prior constraints on the mass-to-distance ratio for Sgr A* to show that the observed image size is within ~10% of the Kerr predictions. We use these bounds to constrain metrics that are parametrically different from Kerr, as well as the charges of several known spacetimes. To consider alternatives to the presence of an event horizon, we explore the possibility that Sgr A* is a compact object with a surface that either absorbs and thermally reemits incident radiation or partially reflects it. Using the observed image size and the broadband spectrum of Sgr A*, we conclude that a thermal surface can be ruled out and a fully reflective one is unlikely. We compare our results to the broader landscape of gravitational tests. Together with the bounds found for stellar-mass black holes and the M87 black hole, our observations provide further support that the external spacetimes of all black holes are described by the Kerr metric, independent of their mass.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: The Event Horizon Telescope Collaboration

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1868459

Report Number(s):: FERMILAB-PUB-22-422-PPD; oai:inspirehep.net:2080902; TRN: US2306294

Journal Information:: The Astrophysical Journal. Letters, Vol. 930, Issue 2; ISSN 2041-8205

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

References (261)

On quantum deformation of the Schwarzschild solution Kazakov, D. I.; Solodukhin, S. N. Nuclear Physics B, Vol. 429, Issue 1 https://doi.org/10.1016/S0550-3213(94)80045-6	journal	October 1994
A millisecond pulsar in a stellar triple system Ransom, S. M.; Stairs, I. H.; Archibald, A. M. Nature, Vol. 505, Issue 7484 https://doi.org/10.1038/nature12917	journal	January 2014
Bayesian metric reconstruction with gravitational wave observations Völkel, Sebastian H.; Barausse, Enrico Physical Review D, Vol. 102, Issue 8 https://doi.org/10.1103/PhysRevD.102.084025	journal	October 2020
Source-Intrinsic Near-Infrared Properties of sgr a*: Total Intensity Measurements Witzel, G.; Eckart, A.; Bremer, M. The Astrophysical Journal Supplement Series, Vol. 203, Issue 2 https://doi.org/10.1088/0067-0049/203/2/18	journal	November 2012
Strong-field tests of relativistic gravity and binary pulsars Damour, Thibault; Taylor, J. H. Physical Review D, Vol. 45, Issue 6 https://doi.org/10.1103/PhysRevD.45.1840	journal	March 1992
Multiwavelength Light Curves of Two Remarkable Sagittarius A* Flares Fazio, G. G.; Hora, J. L.; Witzel, G. The Astrophysical Journal, Vol. 864, Issue 1 https://doi.org/10.3847/1538-4357/aad4a2	journal	August 2018
Sgr A*: The Optimal Testbed of Strong-Field Gravity Psaltis, Dimitrios; Johannsen, Tim Journal of Physics: Conference Series, Vol. 283 https://doi.org/10.1088/1742-6596/283/1/012030	journal	February 2011
Asymptotic safety casts its shadow Held, Aaron; Gold, Roman; Eichhorn, Astrid Journal of Cosmology and Astroparticle Physics, Vol. 2019, Issue 06 https://doi.org/10.1088/1475-7516/2019/06/029	journal	June 2019
Orbital precession of the S2 star in Scalar–Tensor–Vector Gravity Della Monica, Riccardo; de Martino, Ivan; de Laurentis, Mariafelicia Monthly Notices of the Royal Astronomical Society, Vol. 510, Issue 4 https://doi.org/10.1093/mnras/stab3727	journal	December 2021
The shape of the black hole photon ring: A precise test of strong-field general relativity Gralla, Samuel E.; Lupsasca, Alexandru; Marrone, Daniel P. Physical Review D, Vol. 102, Issue 12 https://doi.org/10.1103/PhysRevD.102.124004	journal	December 2020
First Sagittarius A* Event Horizon Telescope Results. III. Imaging of the Galactic Center Supermassive Black Hole Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter The Astrophysical Journal Letters, Vol. 930, Issue 2 https://doi.org/10.3847/2041-8213/ac6429	journal	May 2022
Shadows and strong gravitational lensing: a brief review Cunha, Pedro V. P.; Herdeiro, Carlos A. R. General Relativity and Gravitation, Vol. 50, Issue 4 https://doi.org/10.1007/s10714-018-2361-9	journal	March 2018
Shadow of rotating regular black holes Abdujabbarov, Ahmadjon; Amir, Muhammed; Ahmedov, Bobomurat Physical Review D, Vol. 93, Issue 10 https://doi.org/10.1103/PhysRevD.93.104004	journal	May 2016
On the nature of the dark mass in the centre of the Milky Way Genzel, R.; Eckart, A.; Ott, T. Monthly Notices of the Royal Astronomical Society, Vol. 291, Issue 1 https://doi.org/10.1093/mnras/291.1.219	journal	October 1997
New tests of the strong equivalence principle using binary-pulsar data Damour, Thibault; Schäfer, Gerhard Physical Review Letters, Vol. 66, Issue 20 https://doi.org/10.1103/PhysRevLett.66.2549	journal	May 1991
Improved determination of γ by VLBI Lambert, S. B.; Le Poncin-Lafitte, C. Astronomy & Astrophysics, Vol. 529 https://doi.org/10.1051/0004-6361/201016370	journal	April 2011
Improving Galactic Center Astrometry by Reducing the Effects of Geometric Distortion Yelda, S.; Lu, J. R.; Ghez, A. M. The Astrophysical Journal, Vol. 725, Issue 1 https://doi.org/10.1088/0004-637X/725/1/331	journal	November 2010
General relativistic magnetohydrodynamical κ -jet models for Sagittarius A* Davelaar, J.; Mościbrodzka, M.; Bronzwaer, T. Astronomy & Astrophysics, Vol. 612 https://doi.org/10.1051/0004-6361/201732025	journal	April 2018
Universal interferometric signatures of a black hole’s photon ring Johnson, Michael D.; Lupsasca, Alexandru; Strominger, Andrew Science Advances, Vol. 6, Issue 12 https://doi.org/10.1126/sciadv.aaz1310	journal	March 2020
Test of the Einstein Equivalence Principle near the Galactic Center Supermassive Black Hole Amorim, A.; Bauböck, M.; Berger, J. P. Physical Review Letters, Vol. 122, Issue 10 https://doi.org/10.1103/PhysRevLett.122.101102	journal	March 2019
Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum. ii. Black hole Images Johannsen, Tim; Psaltis, Dimitrios The Astrophysical Journal, Vol. 718, Issue 1 https://doi.org/10.1088/0004-637X/718/1/446	journal	June 2010
New varying speed of light theories Magueijo, João Reports on Progress in Physics, Vol. 66, Issue 11 https://doi.org/10.1088/0034-4885/66/11/R04	journal	October 2003
Detection of orbital motions near the last stable circular orbit of the massive black hole SgrA* Abuter, R.; Amorim, A.; Bauböck, M. Astronomy & Astrophysics, Vol. 618 https://doi.org/10.1051/0004-6361/201834294	journal	October 2018
Rotating traversable wormholes Teo, Edward Physical Review D, Vol. 58, Issue 2 https://doi.org/10.1103/PhysRevD.58.024014	journal	June 1998
Constraining particle acceleration in Sgr A ^⋆ with simultaneous GRAVITY, Spitzer , NuSTAR , and Chandra observations Abuter, R.; Amorim, A.; Bauböck, M. Astronomy & Astrophysics, Vol. 654 https://doi.org/10.1051/0004-6361/202140981	journal	October 2021
The First Laser Guide Star Adaptive Optics Observations of the Galactic Center: Sgr A*’s Infrared Color and the Extended Red Emission in its Vicinity Ghez, A. M.; Hornstein, S. D.; Lu, J. R. The Astrophysical Journal, Vol. 635, Issue 2 https://doi.org/10.1086/497576	journal	December 2005
Improved GRAVITY astrometric accuracy from modeling optical aberrations Abuter, R.; Amorim, A.; Bauböck, M. Astronomy & Astrophysics, Vol. 647 https://doi.org/10.1051/0004-6361/202040208	journal	March 2021
On the Nature of the Fast-Moving Star S2 in the Galactic Center Martins, F.; Gillessen, S.; Eisenhauer, F. The Astrophysical Journal, Vol. 672, Issue 2 https://doi.org/10.1086/526768	journal	December 2007
Shadows of spherically symmetric black holes and naked singularities Shaikh, Rajibul; Kocherlakota, Prashant; Narayan, Ramesh Monthly Notices of the Royal Astronomical Society, Vol. 482, Issue 1 https://doi.org/10.1093/mnras/sty2624	journal	October 2018
$f (R)$ gravity after the detection of the orbital precession of the S2 star around the Galactic Center massive black hole De Martino, Ivan; della Monica, Riccardo; De Laurentis, Mariafelicia Physical Review D, Vol. 104, Issue 10 https://doi.org/10.1103/PhysRevD.104.L101502	journal	November 2021
Supersymmetry as a cosmic censor Kallosh, Renata; Linde, Andrei; Ortín, Tomás Physical Review D, Vol. 46, Issue 12 https://doi.org/10.1103/PhysRevD.46.5278	journal	December 1992
General parametrization of axisymmetric black holes in metric theories of gravity Konoplya, Roman; Rezzolla, Luciano; Zhidenko, Alexander Physical Review D, Vol. 93, Issue 6 https://doi.org/10.1103/PhysRevD.93.064015	journal	March 2016
Deflection of light to second order: A tool for illustrating principles of general relativity Bodenner, Jeremiah; Will, Clifford M. American Journal of Physics, Vol. 71, Issue 8 https://doi.org/10.1119/1.1570416	journal	August 2003
Dynamics and observational signatures of shell-like black hole mimickers Danielsson, Ulf; Lehner, Luis; Pretorius, Frans Physical Review D, Vol. 104, Issue 12 https://doi.org/10.1103/PhysRevD.104.124011	journal	December 2021
New method for shadow calculations: Application to parametrized axisymmetric black holes Younsi, Ziri; Zhidenko, Alexander; Rezzolla, Luciano Physical Review D, Vol. 94, Issue 8 https://doi.org/10.1103/PhysRevD.94.084025	journal	October 2016
Approximate waveforms for extreme-mass-ratio inspirals in modified gravity spacetimes Gair, Jonathan; Yunes, Nicolás Physical Review D, Vol. 84, Issue 6 https://doi.org/10.1103/PhysRevD.84.064016	journal	September 2011
heroic: 3D general relativistic radiative post-processor with comptonization for black hole accretion discs Narayan, Ramesh; Zhu, Yucong; Psaltis, Dimitrios Monthly Notices of the Royal Astronomical Society, Vol. 457, Issue 1 https://doi.org/10.1093/mnras/stv2979	journal	January 2016
Measuring Distance and Properties of the Milky Way’s Central Supermassive Black Hole with Stellar Orbits Ghez, A. M.; Salim, S.; Weinberg, N. N. The Astrophysical Journal, Vol. 689, Issue 2 https://doi.org/10.1086/592738	journal	December 2008
Metric for rapidly spinning black holes suitable for strong-field tests of the no-hair theorem Johannsen, Tim; Psaltis, Dimitrios Physical Review D, Vol. 83, Issue 12 https://doi.org/10.1103/PhysRevD.83.124015	journal	June 2011
Republication of: The theoretical significance of experimental relativity Dicke, R. H. General Relativity and Gravitation, Vol. 51, Issue 5 https://doi.org/10.1007/s10714-019-2509-2	journal	April 2019
Cosmological Tests of Gravity Ferreira, Pedro G. Annual Review of Astronomy and Astrophysics, Vol. 57, Issue 1 https://doi.org/10.1146/annurev-astro-091918-104423	journal	August 2019
Dynamically important magnetic fields near the event horizon of Sgr A* Jiménez-Rosales, A.; Dexter, J.; Widmann, F. Astronomy & Astrophysics, Vol. 643 https://doi.org/10.1051/0004-6361/202038283	journal	November 2020
Reflection-asymmetric wormholes and their double shadows Wielgus, Maciek; Horák, Jiří; Vincent, Frederic Physical Review D, Vol. 102, Issue 8 https://doi.org/10.1103/PhysRevD.102.084044	journal	October 2020
Quantum Phase Transitions and the Failure of Classical General Relativity Chapline, George International Journal of Modern Physics A, Vol. 18, Issue 21 https://doi.org/10.1142/S0217751X03016380	journal	August 2003
Particle Acceleration and the Origin of X-Ray Flares in Grmhd Simulations of sgr a* Ball, David; Özel, Feryal; Psaltis, Dimitrios The Astrophysical Journal, Vol. 826, Issue 1 https://doi.org/10.3847/0004-637X/826/1/77	journal	July 2016
Advection-dominated Accretion: Underfed Black Holes and Neutron Stars Narayan, Ramesh; Yi, Insu The Astrophysical Journal, Vol. 452 https://doi.org/10.1086/176343	journal	October 1995
Sgr A* near-infrared flares from reconnection events in a magnetically arrested disc Dexter, J.; Tchekhovskoy, A.; Jiménez-Rosales, A. Monthly Notices of the Royal Astronomical Society, Vol. 497, Issue 4 https://doi.org/10.1093/mnras/staa2288	journal	August 2020
First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter The Astrophysical Journal, Vol. 875, Issue 1 https://doi.org/10.3847/2041-8213/ab1141	journal	April 2019
The Confrontation between General Relativity and Experiment Will, Clifford M. Living Reviews in Relativity, Vol. 17, Issue 1 https://doi.org/10.12942/lrr-2014-4	journal	June 2014
A Parametric Model for the Shapes of Black Hole Shadows in Non-Kerr Spacetimes Medeiros, Lia; Psaltis, Dimitrios; Özel, Feryal The Astrophysical Journal, Vol. 896, Issue 1 https://doi.org/10.3847/1538-4357/ab8bd1	journal	June 2020
Thin accretion disks in stationary axisymmetric wormhole spacetimes Harko, Tiberiu; Kovács, Zoltán; Lobo, Francisco S. N. Physical Review D, Vol. 79, Issue 6 https://doi.org/10.1103/PhysRevD.79.064001	journal	March 2009
Systematic study of event horizons and pathologies of parametrically deformed Kerr spacetimes Johannsen, Tim Physical Review D, Vol. 87, Issue 12 https://doi.org/10.1103/PhysRevD.87.124017	journal	June 2013
Global Structure of the Kerr Family of Gravitational Fields Carter, Brandon Physical Review, Vol. 174, Issue 5 https://doi.org/10.1103/PhysRev.174.1559	journal	October 1968
How to tell an accreting boson star from a black hole Olivares, Hector; Younsi, Ziri; Fromm, Christian M. Monthly Notices of the Royal Astronomical Society, Vol. 497, Issue 1 https://doi.org/10.1093/mnras/staa1878	journal	July 2020
Strong Constraints on Cosmological Gravity from GW170817 and GRB 170817A Baker, T.; Bellini, E.; Ferreira, P. G. Physical Review Letters, Vol. 119, Issue 25 https://doi.org/10.1103/PhysRevLett.119.251301	journal	December 2017
GRay: A MASSIVELY PARALLEL GPU-BASED CODE FOR RAY TRACING IN RELATIVISTIC SPACETIMES Chan, Chi-kwan; Psaltis, Dimitrios; Özel, Feryal The Astrophysical Journal, Vol. 777, Issue 1 https://doi.org/10.1088/0004-637X/777/1/13	journal	October 2013
Evaluation of New Submillimeter VLBI Sites for the Event Horizon Telescope Raymond, Alexander W.; Palumbo, Daniel; Paine, Scott N. The Astrophysical Journal Supplement Series, Vol. 253, Issue 1 https://doi.org/10.3847/1538-3881/abc3c3	journal	February 2021
An Adaptive Scheduling Tool to Optimize Measurements to Reach a Scientific Objective: Methodology and Application to Measurements of Stellar Orbits in the Galactic Center Hees, A.; Dehghanfar, A.; Do, T. The Astrophysical Journal, Vol. 880, Issue 2 https://doi.org/10.3847/1538-4357/ab2ae0	journal	July 2019
Distinguishing gravitational and emission physics in black hole imaging: spherical symmetry Kocherlakota, Prashant; Rezzolla, Luciano Monthly Notices of the Royal Astronomical Society, Vol. 513, Issue 1 https://doi.org/10.1093/mnras/stac891	journal	April 2022
SPITZER /IRAC OBSERVATIONS OF THE VARIABILITY OF Sgr A* AND THE OBJECT G2 AT 4.5 μm Hora, J. L.; Witzel, G.; Ashby, M. L. N. The Astrophysical Journal, Vol. 793, Issue 2 https://doi.org/10.1088/0004-637X/793/2/120	journal	September 2014
Improving Orbit Estimates for Incomplete Orbits with a New Approach to Priors: with Applications from Black Holes to Planets O’Neil, K. Kosmo; Martinez, G. D.; Hees, A. The Astronomical Journal, Vol. 158, Issue 1 https://doi.org/10.3847/1538-3881/ab1d66	journal	June 2019
The structure of the nuclear stellar cluster of the Milky Way Schödel, R.; Eckart, A.; Alexander, T. Astronomy & Astrophysics, Vol. 469, Issue 1 https://doi.org/10.1051/0004-6361:20065089	journal	May 2007
Fundamental theoretical bias in gravitational wave astrophysics and the parametrized post-Einsteinian framework Yunes, Nicolás; Pretorius, Frans Physical Review D, Vol. 80, Issue 12 https://doi.org/10.1103/PhysRevD.80.122003	journal	December 2009
Variability Timescale and Spectral Index of Sgr A* in the Near Infrared: Approximate Bayesian Computation Analysis of the Variability of the Closest Supermassive Black Hole Witzel, G.; Martinez, G.; Hora, J. The Astrophysical Journal, Vol. 863, Issue 1 https://doi.org/10.3847/1538-4357/aace62	journal	August 2018
The Shadow of a Spherically Accreting Black Hole Narayan, Ramesh; Johnson, Michael D.; Gammie, Charles F. The Astrophysical Journal, Vol. 885, Issue 2 https://doi.org/10.3847/2041-8213/ab518c	journal	November 2019
Three-Dimensional Stellar Kinematics at the Galactic Center: Measuring the Nuclear star Cluster Spatial Density Profile, Black hole Mass, and Distance Do, T.; Martinez, G. D.; Yelda, S. The Astrophysical Journal, Vol. 779, Issue 1 https://doi.org/10.1088/2041-8205/779/1/L6	journal	November 2013
Mass distribution in the Galactic Center based on interferometric astrometry of multiple stellar orbits Abuter, R.; Aimar, N.; Amorim, A. Astronomy & Astrophysics, Vol. 657 https://doi.org/10.1051/0004-6361/202142465	journal	January 2022
Metrics and Motivations for Earth–Space VLBI: Time-resolving Sgr A* with the Event Horizon Telescope Palumbo, Daniel C. M.; Doeleman, Sheperd S.; Johnson, Michael D. The Astrophysical Journal, Vol. 881, Issue 1 https://doi.org/10.3847/1538-4357/ab2bed	journal	August 2019
New parametrization for spherically symmetric black holes in metric theories of gravity Rezzolla, Luciano; Zhidenko, Alexander Physical Review D, Vol. 90, Issue 8 https://doi.org/10.1103/PhysRevD.90.084009	journal	October 2014
Uniqueness of the Kerr Black Hole Robinson, D. C. Physical Review Letters, Vol. 34, Issue 14 https://doi.org/10.1103/PhysRevLett.34.905	journal	April 1975
MeqSilhouette v2: spectrally resolved polarimetric synthetic data generation for the event horizon telescope Natarajan, Iniyan; Deane, Roger; Martí-Vidal, Iván Monthly Notices of the Royal Astronomical Society, Vol. 512, Issue 1 https://doi.org/10.1093/mnras/stac531	journal	February 2022
THEZA: TeraHertz Exploration and Zooming-in for Astrophysics: An ESA Voyage 2050 White Paper Gurvits, Leonid I.; Paragi, Zsolt; Casasola, Viviana Experimental Astronomy, Vol. 51, Issue 3 https://doi.org/10.1007/s10686-021-09714-y	journal	May 2021
The current ability to test theories of gravity with black hole shadows Mizuno, Yosuke; Younsi, Ziri; Fromm, Christian M. Nature Astronomy, Vol. 2, Issue 7 https://doi.org/10.1038/s41550-018-0449-5	journal	April 2018
Challenging the presence of scalar charge and dipolar radiation in binary pulsars Yagi, Kent; Stein, Leo C.; Yunes, Nicolás Physical Review D, Vol. 93, Issue 2 https://doi.org/10.1103/PhysRevD.93.024010	journal	January 2016
Toward the event horizon—the supermassive black hole in the Galactic Center Falcke, H.; Markoff, S. B. Classical and Quantum Gravity, Vol. 30, Issue 24 https://doi.org/10.1088/0264-9381/30/24/244003	journal	November 2013
A powerful flare from Sgr A* confirms the synchrotron nature of the X-ray emission Ponti, G.; George, E.; Scaringi, S. Monthly Notices of the Royal Astronomical Society, Vol. 468, Issue 2 https://doi.org/10.1093/mnras/stx596	journal	March 2017
Kerr Black Holes Are Not Unique to General Relativity Psaltis, Dimitrios; Perrodin, Delphine; Dienes, Keith R. Physical Review Letters, Vol. 100, Issue 9 https://doi.org/10.1103/PhysRevLett.100.091101	journal	March 2008
Black Hole Flares: Ejection of Accreted Magnetic Flux through 3D Plasmoid-mediated Reconnection Ripperda, B.; Liska, M.; Chatterjee, K. The Astrophysical Journal Letters, Vol. 924, Issue 2 https://doi.org/10.3847/2041-8213/ac46a1	journal	January 2022
Accretion onto neutron stars under adiabatic shock conditions Shapiro, S. L.; Salpeter, E. E. The Astrophysical Journal, Vol. 198 https://doi.org/10.1086/153645	journal	June 1975
Polarimetric Properties of Event Horizon Telescope Targets from ALMA Goddi, Ciriaco; Martí-Vidal, Iván; Messias, Hugo The Astrophysical Journal Letters, Vol. 910, Issue 1 https://doi.org/10.3847/2041-8213/abee6a	journal	March 2021
Search for a Variation of the Fine Structure Constant around the Supermassive Black Hole in Our Galactic Center Hees, A.; Do, T.; Roberts, B. M. Physical Review Letters, Vol. 124, Issue 8 https://doi.org/10.1103/PhysRevLett.124.081101	journal	February 2020
The Orbit of the star s2 Around sgr a* from very Large Telescope and keck data Gillessen, S.; Eisenhauer, F.; Fritz, T. K. The Astrophysical Journal, Vol. 707, Issue 2 https://doi.org/10.1088/0004-637X/707/2/L114	journal	December 2009
Testing general relativity with the Event Horizon Telescope Psaltis, Dimitrios General Relativity and Gravitation, Vol. 51, Issue 10 https://doi.org/10.1007/s10714-019-2611-5	journal	October 2019
Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole Abuter, R.; Amorim, A.; Bauböck, M. Astronomy & Astrophysics, Vol. 636 https://doi.org/10.1051/0004-6361/202037813	journal	April 2020
Testing General Relativity with Stellar Orbits around the Supermassive Black Hole in Our Galactic Center Hees, A.; Do, T.; Ghez, A. M. Physical Review Letters, Vol. 118, Issue 21 https://doi.org/10.1103/PhysRevLett.118.211101	journal	May 2017
Second-scale Submillimeter Variability of Sagittarius A* during Flaring Activity of 2019: On the Origin of Bright Near-infrared Flares Murchikova, Lena; Witzel, Gunther The Astrophysical Journal Letters, Vol. 920, Issue 1 https://doi.org/10.3847/2041-8213/ac2308	journal	October 2021
Shapes and Positions of Black Hole Shadows in Accretion Disks and Spin Parameters of Black Holes Takahashi, Rohta The Astrophysical Journal, Vol. 611, Issue 2 https://doi.org/10.1086/422403	journal	August 2004
Probing the black hole metric: Black hole shadows and binary black-hole inspirals Psaltis, Dimitrios; Talbot, Colm; Payne, Ethan Physical Review D, Vol. 103, Issue 10 https://doi.org/10.1103/PhysRevD.103.104036	journal	May 2021
Tests of general relativity with the binary black hole signals from the LIGO-Virgo catalog GWTC-1 Abbott, B. P.; Abbott, R.; Abbott, T. D. Physical Review D, Vol. 100, Issue 10 https://doi.org/10.1103/PhysRevD.100.104036	journal	November 2019
Bumpy black holes in alternative theories of gravity Vigeland, Sarah; Yunes, Nicolás; Stein, Leo C. Physical Review D, Vol. 83, Issue 10 https://doi.org/10.1103/PhysRevD.83.104027	journal	May 2011
The Event Horizon of Sagittarius a* Broderick, Avery E.; Loeb, Abraham; Narayan, Ramesh The Astrophysical Journal, Vol. 701, Issue 2 https://doi.org/10.1088/0004-637X/701/2/1357	journal	July 2009
Gravitational Radiation and the Motion of Two Point Masses Peters, P. C. Physical Review, Vol. 136, Issue 4B https://doi.org/10.1103/PhysRev.136.B1224	journal	November 1964
The disc-jet symbiosis emerges: modelling the emission of Sagittarius A* with electron thermodynamics Ressler, S. M.; Tchekhovskoy, A.; Quataert, E. Monthly Notices of the Royal Astronomical Society, Vol. 467, Issue 3 https://doi.org/10.1093/mnras/stx364	journal	February 2017
Shadows of rotating wormholes Shaikh, Rajibul Physical Review D, Vol. 98, Issue 2 https://doi.org/10.1103/PhysRevD.98.024044	journal	July 2018
Event horizons in static electrovac space-times Israel, Werner Communications in Mathematical Physics, Vol. 8, Issue 3 https://doi.org/10.1007/BF01645859	journal	September 1968
Stellar dynamics in the Galactic Centre: proper motions and anisotropy Genzel, R.; Pichon, C.; Eckart, A. Monthly Notices of the Royal Astronomical Society, Vol. 317, Issue 2 https://doi.org/10.1046/j.1365-8711.2000.03582.x	journal	September 2000
Effective one-body approach to general relativistic two-body dynamics Buonanno, A.; Damour, T. Physical Review D, Vol. 59, Issue 8 https://doi.org/10.1103/PhysRevD.59.084006	journal	March 1999
Testing the nature of dark compact objects: a status report Cardoso, Vitor; Pani, Paolo Living Reviews in Relativity, Vol. 22, Issue 1 https://doi.org/10.1007/s41114-019-0020-4	journal	July 2019
BlackHoleCam: Fundamental physics of the galactic center Goddi, C.; Falcke, H.; Kramer, M. International Journal of Modern Physics D, Vol. 26, Issue 02 https://doi.org/10.1142/S0218271817300014	journal	February 2017
Linking Tests of Gravity on all Scales: from the Strong-Field Regime to Cosmology Baker, Tessa; Psaltis, Dimitrios; Skordis, Constantinos The Astrophysical Journal, Vol. 802, Issue 1 https://doi.org/10.1088/0004-637X/802/1/63	journal	March 2015
ALMA Observations of the Terahertz Spectrum of Sagittarius A* Bower, Geoffrey C.; Dexter, Jason; Asada, Keiichi The Astrophysical Journal, Vol. 881, Issue 1 https://doi.org/10.3847/2041-8213/ab3397	journal	August 2019
RADIO AND MILLIMETER MONITORING OF $\mathrm{Sgr}$ A ^⋆ : SPECTRUM, VARIABILITY, AND CONSTRAINTS ON THE G2 ENCOUNTER Bower, Geoffrey C.; Markoff, Sera; Dexter, Jason The Astrophysical Journal, Vol. 802, Issue 1 https://doi.org/10.1088/0004-637X/802/1/69	journal	March 2015
Constraints on black-hole charges with the 2017 EHT observations of M87* Kocherlakota, Prashant; Rezzolla, Luciano; Falcke, Heino Physical Review D, Vol. 103, Issue 10 https://doi.org/10.1103/PhysRevD.103.104047	journal	May 2021
An 8 h characteristic time-scale in submillimetre light curves of Sagittarius A* Dexter, Jason; Kelly, Brandon; Bower, Geoffrey C. Monthly Notices of the Royal Astronomical Society, Vol. 442, Issue 3 https://doi.org/10.1093/mnras/stu1039	journal	June 2014
Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre Baganoff, F. K.; Bautz, M. W.; Brandt, W. N. Nature, Vol. 413, Issue 6851 https://doi.org/10.1038/35092510	journal	September 2001
Detection of faint stars near Sagittarius A* with GRAVITY Abuter, R.; Amorim, A.; Bauböck, M. Astronomy & Astrophysics, Vol. 645 https://doi.org/10.1051/0004-6361/202039544	journal	January 2021
A QUANTITATIVE TEST OF THE NO-HAIR THEOREM WITH Sgr A* USING STARS, PULSARS, AND THE EVENT HORIZON TELESCOPE Psaltis, Dimitrios; Wex, Norbert; Kramer, Michael The Astrophysical Journal, Vol. 818, Issue 2 https://doi.org/10.3847/0004-637X/818/2/121	journal	February 2016
A Detection of Sgr A* in the Far Infrared von Fellenberg, Sebastiano D.; Gillessen, Stefan; Graciá-Carpio, Javier The Astrophysical Journal, Vol. 862, Issue 2 https://doi.org/10.3847/1538-4357/aacd4b	journal	July 2018
An Event Horizon Imager (EHI) Mission Concept Utilizing Medium Earth Orbit Sub-mm Interferometry^* Kudriashov, V.; Martin-Neira, M.; Roelofs, F. Chinese Journal of Space Science, Vol. 41, Issue 02 https://doi.org/10.3724/SP.J.0254-6124.2021.0202	journal	March 2021
General relativistic radiative transfer: formulation and emission from structured tori around black holes Younsi, Z.; Wu, K.; Fuerst, S. V. Astronomy & Astrophysics, Vol. 545 https://doi.org/10.1051/0004-6361/201219599	journal	August 2012
Gravitational Field of a Spinning Mass as an Example of Algebraically Special Metrics Kerr, Roy P. Physical Review Letters, Vol. 11, Issue 5 https://doi.org/10.1103/PhysRevLett.11.237	journal	September 1963
Relativistic redshift of the star S0-2 orbiting the Galactic Center supermassive black hole Do, Tuan; Hees, Aurelien; Ghez, Andrea Science, Vol. 365, Issue 6454 https://doi.org/10.1126/science.aav8137	journal	August 2019
Jets in magnetically arrested hot accretion flows: geometry, power, and black hole spin-down Narayan, Ramesh; Chael, Andrew; Chatterjee, Koushik Monthly Notices of the Royal Astronomical Society, Vol. 511, Issue 3 https://doi.org/10.1093/mnras/stac285	journal	February 2022
A Constant Spectral Index for Sagittarius A* during Infrared/X‐Ray Intensity Variations Hornstein, S. D.; Matthews, K.; Ghez, A. M. The Astrophysical Journal, Vol. 667, Issue 2 https://doi.org/10.1086/520762	journal	October 2007
Equilibrium configurations from gravitational collapse Joshi, Pankaj S.; Malafarina, Daniele; Narayan, Ramesh Classical and Quantum Gravity, Vol. 28, Issue 23 https://doi.org/10.1088/0264-9381/28/23/235018	journal	November 2011
hero – A 3D general relativistic radiative post-processor for accretion discs around black holes Zhu, Yucong; Narayan, Ramesh; Sadowski, Aleksander Monthly Notices of the Royal Astronomical Society, Vol. 451, Issue 2 https://doi.org/10.1093/mnras/stv1046	journal	June 2015
General relativistic magnetohydrodynamical simulations of the jet in M 87 Mościbrodzka, Monika; Falcke, Heino; Shiokawa, Hotaka Astronomy & Astrophysics, Vol. 586 https://doi.org/10.1051/0004-6361/201526630	journal	January 2016
Tests of general relativity with binary black holes from the second LIGO-Virgo gravitational-wave transient catalog Abbott, R.; Abbott, T. D.; Abraham, S. Physical Review D, Vol. 103, Issue 12 https://doi.org/10.1103/PhysRevD.103.122002	journal	June 2021
Adaptive Optics Near‐Infrared Spectroscopy of the Sagittarius A* Cluster Gezari, S.; Ghez, A. M.; Becklin, E. E. The Astrophysical Journal, Vol. 576, Issue 2 https://doi.org/10.1086/341807	journal	September 2002
The black hole accretion code Porth, Oliver; Olivares, Hector; Mizuno, Yosuke Computational Astrophysics and Cosmology, Vol. 4, Issue 1 https://doi.org/10.1186/s40668-017-0020-2	journal	May 2017
The flux distribution of Sgr A* Abuter, R.; Amorim, A.; Bauböck, M. Astronomy & Astrophysics, Vol. 638 https://doi.org/10.1051/0004-6361/202037717	journal	May 2020
Black holes and membranes in higher-dimensional theories with dilaton fields Gibbons, G. W.; Maeda, Kei-ichi Nuclear Physics B, Vol. 298, Issue 4 https://doi.org/10.1016/0550-3213(88)90006-5	journal	March 1988
Test-particle dynamics in general spherically symmetric black hole spacetimes De Laurentis, Mariafelicia; Younsi, Ziri; Porth, Oliver Physical Review D, Vol. 97, Issue 10 https://doi.org/10.1103/PhysRevD.97.104024	journal	May 2018
Near-infrared flares from accreting gas around the supermassive black hole at the Galactic Centre Genzel, R.; Schödel, R.; Ott, T. Nature, Vol. 425, Issue 6961 https://doi.org/10.1038/nature02065	journal	October 2003
Advection‐dominated Accretion Model of Sagittarius A*: Evidence for a Black Hole at the Galactic Center Narayan, Ramesh; Mahadevan, Rohan; Grindlay, Jonathan E. The Astrophysical Journal, Vol. 492, Issue 2 https://doi.org/10.1086/305070	journal	January 1998
Advection-dominated Accretion and Black Hole Event Horizons Narayan, Ramesh; Garcia, Michael R.; McClintock, Jeffrey E. The Astrophysical Journal, Vol. 478, Issue 2 https://doi.org/10.1086/310554	journal	April 1997
Formation and Evaporation of Nonsingular Black Holes Hayward, Sean A. Physical Review Letters, Vol. 96, Issue 3 https://doi.org/10.1103/PhysRevLett.96.031103	journal	January 2006
First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter The Astrophysical Journal Letters, Vol. 930, Issue 2 https://doi.org/10.3847/2041-8213/ac6672	journal	May 2022
Axisymmetric Black Hole Has Only Two Degrees of Freedom Carter, B. Physical Review Letters, Vol. 26, Issue 6 https://doi.org/10.1103/PhysRevLett.26.331	journal	February 1971
First Sagittarius A* Event Horizon Telescope Results. II. EHT and Multiwavelength Observations, Data Processing, and Calibration Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter The Astrophysical Journal Letters, Vol. 930, Issue 2 https://doi.org/10.3847/2041-8213/ac6675	journal	May 2022
The Nature of the 10 kilosecond X-ray flare in Sgr A* Markoff, S.; Falcke, H.; Yuan, F. Astronomy & Astrophysics, Vol. 379, Issue 1 https://doi.org/10.1051/0004-6361:20011346	journal	November 2001
Echoes of multiple outbursts of Sagittarius A ^⋆ revealed by Chandra Clavel, M.; Terrier, R.; Goldwurm, A. Astronomy & Astrophysics, Vol. 558 https://doi.org/10.1051/0004-6361/201321667	journal	September 2013
Tests of General Relativity with GW150914 Abbott, B. P.; Abbott, R.; Abbott, T. D. Physical Review Letters, Vol. 116, Issue 22 https://doi.org/10.1103/PhysRevLett.116.221101	journal	May 2016
The Compact source at the Galactic Center Rees, Martin J. AIP Conference Proceedings Vol 83 https://doi.org/10.1063/1.33482	conference	January 1982
Exact theory for the Rezzolla-Zhidenko metric and self-consistent calculation of quasinormal modes Suvorov, Arthur G.; Völkel, Sebastian H. Physical Review D, Vol. 103, Issue 4 https://doi.org/10.1103/PhysRevD.103.044027	journal	February 2021
Notes on nonsingular models of black holes Frolov, Valeri P. Physical Review D, Vol. 94, Issue 10 https://doi.org/10.1103/PhysRevD.94.104056	journal	November 2016
On the Nature of the Compact Dark Mass at the Galactic Center Broderick, Avery E.; Narayan, Ramesh The Astrophysical Journal, Vol. 638, Issue 1 https://doi.org/10.1086/500930	journal	January 2006
Trigonometric Parallaxes of High-mass Star-forming Regions: Our View of the Milky Way Reid, M. J.; Menten, K. M.; Brunthaler, A. The Astrophysical Journal, Vol. 885, Issue 2 https://doi.org/10.3847/1538-4357/ab4a11	journal	November 2019
Event Horizons in Static Vacuum Space-Times Israel, Werner Physical Review, Vol. 164, Issue 5 https://doi.org/10.1103/PhysRev.164.1776	journal	December 1967
Simultaneous Multiwavelength Observations of Sagittarius A* An, T.; Goss, W. M.; Zhao, Jun-Hui The Astrophysical Journal, Vol. 634, Issue 1 https://doi.org/10.1086/498687	journal	November 2005
Reality of the Schwarzschild Singularity Janis, Allen I.; Newman, Ezra T.; Winicour, Jeffrey Physical Review Letters, Vol. 20, Issue 16 https://doi.org/10.1103/PhysRevLett.20.878	journal	April 1968
On the Lack of Thermal Emission from the Quiescent Black Hole XTE J1118+480: Evidence for the Event Horizon McClintock, Jeffrey E.; Narayan, Ramesh; Rybicki, George B. The Astrophysical Journal, Vol. 615, Issue 1 https://doi.org/10.1086/424474	journal	November 2004
First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter The Astrophysical Journal, Vol. 875, Issue 1 https://doi.org/10.3847/2041-8213/ab0f43	journal	April 2019
A Near-Infrared Variability Study of the Galactic Black Hole: a red Noise Source with no Detected Periodicity Do, T.; Ghez, A. M.; Morris, M. R. The Astrophysical Journal, Vol. 691, Issue 2 https://doi.org/10.1088/0004-637X/691/2/1021	journal	January 2009
Hot Accretion Flows Around Black Holes Yuan, Feng; Narayan, Ramesh Annual Review of Astronomy and Astrophysics, Vol. 52, Issue 1 https://doi.org/10.1146/annurev-astro-082812-141003	journal	August 2014
New Evidence for Black Hole Event Horizons from [ITAL]Chandra[/ITAL] Garcia, Michael R.; McClintock, Jeffrey E.; Narayan, Ramesh The Astrophysical Journal, Vol. 553, Issue 1 https://doi.org/10.1086/320494	journal	May 2001
Stellar Orbits around the Galactic Center Black Hole Ghez, A. M.; Salim, S.; Hornstein, S. D. The Astrophysical Journal, Vol. 620, Issue 2 https://doi.org/10.1086/427175	journal	February 2005
The Black hole mass in m87 from Gemini/Nifs Adaptive Optics Observations Gebhardt, Karl; Adams, Joshua; Richstone, Douglas The Astrophysical Journal, Vol. 729, Issue 2 https://doi.org/10.1088/0004-637X/729/2/119	journal	February 2011
Über die Eigengravitation des elektrischen Feldes nach der Einsteinschen Theorie Reissner, H. Annalen der Physik, Vol. 355, Issue 9 https://doi.org/10.1002/andp.19163550905	journal	January 1916
First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter The Astrophysical Journal, Vol. 875, Issue 1 https://doi.org/10.3847/2041-8213/ab0e85	journal	April 2019
Rotating charged black hole solution in heterotic string theory Sen, Ashoke Physical Review Letters, Vol. 69, Issue 7 https://doi.org/10.1103/PhysRevLett.69.1006	journal	August 1992
Trigonometric Parallaxes of high mass star Forming Regions: the Structure and Kinematics of the Milky way Reid, M. J.; Menten, K. M.; Brunthaler, A. The Astrophysical Journal, Vol. 783, Issue 2 https://doi.org/10.1088/0004-637X/783/2/130	journal	February 2014
Photon spheres and spherical accretion image of a hairy black hole Gan, Qingyu; Wang, Peng; Wu, Houwen Physical Review D, Vol. 104, Issue 2 https://doi.org/10.1103/PhysRevD.104.024003	journal	July 2021
No observational proof of the black-hole event-horizon Abramowicz, M. A.; Kluźniak, W.; Lasota, J. -P. Astronomy & Astrophysics, Vol. 396, Issue 3 https://doi.org/10.1051/0004-6361:20021645	journal	December 2002
A GENERAL RELATIVISTIC NULL HYPOTHESIS TEST WITH EVENT HORIZON TELESCOPE OBSERVATIONS OF THE BLACK HOLE SHADOW IN Sgr A* Psaltis, Dimitrios; Özel, Feryal; Chan, Chi-Kwan The Astrophysical Journal, Vol. 814, Issue 2 https://doi.org/10.1088/0004-637X/814/2/115	journal	November 2015
THE X-RAY FLUX DISTRIBUTION OF SAGITTARIUS A* AS SEEN BY CHANDRA Neilsen, J.; Markoff, S.; Nowak, M. A. The Astrophysical Journal, Vol. 799, Issue 2 https://doi.org/10.1088/0004-637X/799/2/199	journal	January 2015
Echoes from the abyss: Tentative evidence for Planck-scale structure at black hole horizons Abedi, Jahed; Dykaar, Hannah; Afshordi, Niayesh Physical Review D, Vol. 96, Issue 8 https://doi.org/10.1103/PhysRevD.96.082004	journal	October 2017
Using space-VLBI to probe gravity around Sgr A ^* Fromm, C. M.; Mizuno, Y.; Younsi, Z. Astronomy & Astrophysics, Vol. 649 https://doi.org/10.1051/0004-6361/201937335	journal	May 2021
ipole – semi-analytic scheme for relativistic polarized radiative transport Mościbrodzka, M.; Gammie, C. F. Monthly Notices of the Royal Astronomical Society, Vol. 475, Issue 1 https://doi.org/10.1093/mnras/stx3162	journal	December 2017
New General Relativistic Contribution to Mercury’s Perihelion Advance Will, Clifford M. Physical Review Letters, Vol. 120, Issue 19 https://doi.org/10.1103/PhysRevLett.120.191101	journal	May 2018
General relativistic MHD simulations of non-thermal flaring in Sagittarius A* Chatterjee, K.; Markoff, S.; Neilsen, J. Monthly Notices of the Royal Astronomical Society, Vol. 507, Issue 4 https://doi.org/10.1093/mnras/stab2466	journal	September 2021
Nonspherical Perturbations of Relativistic Gravitational Collapse. I. Scalar and Gravitational Perturbations Price, Richard H. Physical Review D, Vol. 5, Issue 10 https://doi.org/10.1103/PhysRevD.5.2419	journal	May 1972
Observable properties of orbits in exact bumpy spacetimes Gair, Jonathan R.; Li, Chao; Mandel, Ilya Physical Review D, Vol. 77, Issue 2 https://doi.org/10.1103/PhysRevD.77.024035	journal	January 2008
The Shortest-Known–Period Star Orbiting Our Galaxy’s Supermassive Black Hole Meyer, L.; Ghez, A. M.; Schödel, R. Science, Vol. 338, Issue 6103 https://doi.org/10.1126/science.1225506	journal	October 2012
The Galactic Center: An Improved Astrometric Reference Frame for Stellar Orbits around the Supermassive Black Hole Sakai, Shoko; Lu, Jessica R.; Ghez, Andrea The Astrophysical Journal, Vol. 873, Issue 1 https://doi.org/10.3847/1538-4357/ab0361	journal	March 2019
High Proper‐Motion Stars in the Vicinity of Sagittarius A*: Evidence for a Supermassive Black Hole at the Center of Our Galaxy Ghez, A. M.; Klein, B. L.; Morris, M. The Astrophysical Journal, Vol. 509, Issue 2 https://doi.org/10.1086/306528	journal	December 1998
Polarimetry of near-infrared flares from Sagittarius A* Eckart, A.; Schödel, R.; Meyer, L. Astronomy & Astrophysics, Vol. 455, Issue 1 https://doi.org/10.1051/0004-6361:20064948	journal	July 2006
The Stellar Cusp around the Supermassive Black Hole in the Galactic Center Genzel, R.; Schodel, R.; Ott, T. The Astrophysical Journal, Vol. 594, Issue 2 https://doi.org/10.1086/377127	journal	September 2003
Perturbed Kerr Black Holes Can Probe Deviations from General Relativity Barausse, Enrico; Sotiriou, Thomas P. Physical Review Letters, Vol. 101, Issue 9 https://doi.org/10.1103/PhysRevLett.101.099001	journal	August 2008
First simultaneous NIR/X-ray detection of a flare from Sgr A* Eckart, A.; Baganoff, F. K.; Morris, M. Astronomy & Astrophysics, Vol. 427, Issue 1 https://doi.org/10.1051/0004-6361:20040495	journal	October 2004
The role of electron heating physics in images and variability of the Galactic Centre black hole Sagittarius A* Chael, Andrew; Rowan, Michael; Narayan, Ramesh Monthly Notices of the Royal Astronomical Society, Vol. 478, Issue 4 https://doi.org/10.1093/mnras/sty1261	journal	June 2018
The Galactic Center massive black hole and nuclear star cluster Genzel, Reinhard; Eisenhauer, Frank; Gillessen, Stefan Reviews of Modern Physics, Vol. 82, Issue 4 https://doi.org/10.1103/RevModPhys.82.3121	journal	December 2010
The Position of Sagittarius A*: Accurate Alignment of the Radio and Infrared Reference Frames at the Galactic Center Menten, Karl M.; Reid, Mark J.; Eckart, Andreas The Astrophysical Journal, Vol. 475, Issue 2 https://doi.org/10.1086/310472	journal	February 1997
Where are all the gravastars? Limits upon the gravastar model from accreting black holes Broderick, Avery E.; Narayan, Ramesh Classical and Quantum Gravity, Vol. 24, Issue 3 https://doi.org/10.1088/0264-9381/24/3/009	journal	January 2007
A test of general relativity using radio links with the Cassini spacecraft Bertotti, B.; Iess, L.; Tortora, P. Nature, Vol. 425, Issue 6956 https://doi.org/10.1038/nature01997	journal	September 2003
The accelerations of stars orbiting the Milky Way's central black hole Ghez, A. M.; Morris, M.; Becklin, E. E. Nature, Vol. 407, Issue 6802 https://doi.org/10.1038/35030032	journal	September 2000
Monitoring Stellar Orbits Around the Massive Black hole in the Galactic Center Gillessen, S.; Eisenhauer, F.; Trippe, S. The Astrophysical Journal, Vol. 692, Issue 2 https://doi.org/10.1088/0004-637X/692/2/1075	journal	February 2009
Metric of a Rotating, Charged Mass Newman, E. T.; Couch, E.; Chinnapared, K. Journal of Mathematical Physics, Vol. 6, Issue 6 https://doi.org/10.1063/1.1704351	journal	June 1965
Effect of CO ₂ on the buoyancy of geothermal fluids Straus, Joe M.; Schubert, Gerald Geophysical Research Letters, Vol. 6, Issue 1 https://doi.org/10.1029/GL006i001p00005	journal	January 1979
Observing the Inner Shadow of a Black Hole: A Direct View of the Event Horizon Chael, Andrew; Johnson, Michael D.; Lupsasca, Alexandru The Astrophysical Journal, Vol. 918, Issue 1 https://doi.org/10.3847/1538-4357/ac09ee	journal	August 2021
Class of Stationary Axisymmetric Solutions of the Einstein-Maxwell-Dilaton-Axion Field Equations García, Alberto; Galtsov, Dmitri; Kechkin, Oleg Physical Review Letters, Vol. 74, Issue 8 https://doi.org/10.1103/PhysRevLett.74.1276	journal	February 1995
ALMA and VLA measurements of frequency-dependent time lags in Sagittarius A*: evidence for a relativistic outflow Brinkerink, Christiaan D.; Falcke, Heino; Law, Casey J. Astronomy & Astrophysics, Vol. 576 https://doi.org/10.1051/0004-6361/201424783	journal	March 2015
Flares in the Galactic Centre – I. Orbiting flux tubes in magnetically arrested black hole accretion discs Porth, O.; Mizuno, Y.; Younsi, Z. Monthly Notices of the Royal Astronomical Society, Vol. 502, Issue 2 https://doi.org/10.1093/mnras/stab163	journal	January 2021
Frequency-domain gravitational waves from nonprecessing black-hole binaries. II. A phenomenological model for the advanced detector era Khan, Sebastian; Husa, Sascha; Hannam, Mark Physical Review D, Vol. 93, Issue 4 https://doi.org/10.1103/PhysRevD.93.044007	journal	February 2016
The Simultaneous Spectrum of Sagittarius A* from 20 Centimeters to 1 Millimeter and the Nature of the Millimeter Excess Falcke, Heino; Goss, W. M.; Matsuo, Hiroshi The Astrophysical Journal, Vol. 499, Issue 2 https://doi.org/10.1086/305687	journal	June 1998
How to tell a gravastar from a black hole Chirenti, Cecilia B. M. H.; Rezzolla, Luciano Classical and Quantum Gravity, Vol. 24, Issue 16 https://doi.org/10.1088/0264-9381/24/16/013	journal	July 2007
Wormholes, Time Machines, and the Weak Energy Condition Morris, Michael S.; Thorne, Kip S.; Yurtsever, Ulvi Physical Review Letters, Vol. 61, Issue 13 https://doi.org/10.1103/PhysRevLett.61.1446	journal	September 1988
Imaging black holes and jets with a VLBI array including multiple space-based telescopes Fish, Vincent L.; Shea, Maura; Akiyama, Kazunori Advances in Space Research, Vol. 65, Issue 2 https://doi.org/10.1016/j.asr.2019.03.029	journal	January 2020
Universality of free fall from the orbital motion of a pulsar in a stellar triple system Archibald, Anne M.; Gusinskaia, Nina V.; Hessels, Jason W. T. Nature, Vol. 559, Issue 7712 https://doi.org/10.1038/s41586-018-0265-1	journal	July 2018
Seeking observational evidence for the formation of trapping horizons in astrophysical black holes Carballo-Rubio, Raúl; Kumar, Pawan; Lu, Wenbin Physical Review D, Vol. 97, Issue 12 https://doi.org/10.1103/PhysRevD.97.123012	journal	June 2018
The m87 Black hole mass from Gas-Dynamical Models of Space Telescope Imaging Spectrograph Observations Walsh, Jonelle L.; Barth, Aaron J.; Ho, Luis C. The Astrophysical Journal, Vol. 770, Issue 2 https://doi.org/10.1088/0004-637X/770/2/86	journal	May 2013
Black hole shadows, photon rings, and lensing rings Gralla, Samuel E.; Holz, Daniel E.; Wald, Robert M. Physical Review D, Vol. 100, Issue 2 https://doi.org/10.1103/PhysRevD.100.024018	journal	July 2019
Nonspherical Perturbations of Relativistic Gravitational Collapse. II. Integer-Spin, Zero-Rest-Mass Fields Price, Richard H. Physical Review D, Vol. 5, Issue 10 https://doi.org/10.1103/PhysRevD.5.2439	journal	May 1972
Gravitational-wave versus x-ray tests of strong-field gravity Cárdenas-Avendaño, Alejandro; Nampalliwar, Sourabh; Yunes, Nicolás Classical and Quantum Gravity, Vol. 37, Issue 13 https://doi.org/10.1088/1361-6382/ab8f64	journal	June 2020
Jerusalem lectures on black holes and quantum information Harlow, D. Reviews of Modern Physics, Vol. 88, Issue 1 https://doi.org/10.1103/RevModPhys.88.015002	journal	February 2016
Gravitational waves from the inspiral of a compact object into a massive, axisymmetric body with arbitrary multipole moments Ryan, Fintan D. Physical Review D, Vol. 52, Issue 10 https://doi.org/10.1103/PhysRevD.52.5707	journal	November 1995
rPICARD: A CASA-based calibration pipeline for VLBI data: Calibration and imaging of 7 mm VLBA observations of the AGN jet in M 87 Janssen, M.; Goddi, C.; van Bemmel, I. M. Astronomy & Astrophysics, Vol. 626 https://doi.org/10.1051/0004-6361/201935181	journal	June 2019
Submillimeter and radio variability of Sagittarius A*: A statistical analysis⋆ Subroweit, M.; García-Marín, M.; Eckart, A. Astronomy & Astrophysics, Vol. 601 https://doi.org/10.1051/0004-6361/201628530	journal	May 2017
Explaining the spectrum of Sagittarius A* with a model of an accreting black hole Narayan, Ramesh; Yi, Insu; Mahadevan, Rohan Nature, Vol. 374, Issue 6523 https://doi.org/10.1038/374623a0	journal	April 1995
Nonthermal Electrons in Radiatively Inefficient Accretion Flow Models of Sagittarius A* Yuan, Feng; Quataert, Eliot; Narayan, Ramesh The Astrophysical Journal, Vol. 598, Issue 1 https://doi.org/10.1086/378716	journal	November 2003
Use of MESSENGER radioscience data to improve planetary ephemeris and to test general relativity Verma, A. K.; Fienga, A.; Laskar, J. Astronomy & Astrophysics, Vol. 561 https://doi.org/10.1051/0004-6361/201322124	journal	January 2014
Accurate mapping of spherically symmetric black holes in a parametrized framework Kocherlakota, Prashant; Rezzolla, Luciano Physical Review D, Vol. 102, Issue 6 https://doi.org/10.1103/PhysRevD.102.064058	journal	September 2020
SINFONI in the Galactic Center: Young Stars and Infrared Flares in the Central Light‐Month Eisenhauer, F.; Genzel, R.; Alexander, T. The Astrophysical Journal, Vol. 628, Issue 1 https://doi.org/10.1086/430667	journal	July 2005
The Galactic Center: Improved Relative Astrometry for Velocities, Accelerations, and Orbits near the Supermassive Black Hole Jia, Siyao; Lu, Jessica R.; Sakai, S. The Astrophysical Journal, Vol. 873, Issue 1 https://doi.org/10.3847/1538-4357/ab01de	journal	February 2019
Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity Morris, Michael S.; Thorne, Kip S. American Journal of Physics, Vol. 56, Issue 5 https://doi.org/10.1119/1.15620	journal	May 1988
DISCOVERY OF A SUPERLUMINAL Fe K ECHO AT THE GALACTIC CENTER: THE GLORIOUS PAST OF Sgr A* PRESERVED BY MOLECULAR CLOUDS Ponti, G.; Terrier, R.; Goldwurm, A. The Astrophysical Journal, Vol. 714, Issue 1 https://doi.org/10.1088/0004-637X/714/1/732	journal	April 2010
Black holes in general relativity Hawking, S. W. Communications in Mathematical Physics, Vol. 25, Issue 2 https://doi.org/10.1007/BF01877517	journal	June 1972
On the prospects of imaging Sagittarius A* from space Roelofs, Freek; Falcke, Heino; Brinkerink, Christiaan Proceedings of the International Astronomical Union, Vol. 14, Issue S342 https://doi.org/10.1017/S1743921318007676	journal	May 2018
On the Nature of the Variable Infrared Emission from Sagittarius A* Yuan, Feng; Quataert, Eliot; Narayan, Ramesh The Astrophysical Journal, Vol. 606, Issue 2 https://doi.org/10.1086/383117	journal	May 2004
Charged black holes in string theory Garfinkle, David; Horowitz, Gary T.; Strominger, Andrew Physical Review D, Vol. 43, Issue 10 https://doi.org/10.1103/PhysRevD.43.3140	journal	May 1991
THE TWO STATES OF Sgr A* IN THE NEAR-INFRARED: BRIGHT EPISODIC FLARES ON TOP OF LOW-LEVEL CONTINUOUS VARIABILITY Dodds-Eden, K.; Gillessen, S.; Fritz, T. K. The Astrophysical Journal, Vol. 728, Issue 1 https://doi.org/10.1088/0004-637X/728/1/37	journal	January 2011
iharm3D: Vectorized General Relativistic Magnetohydrodynamics Prather, Ben; Wong, George; Dhruv, Vedant Journal of Open Source Software, Vol. 6, Issue 66 https://doi.org/10.21105/joss.03336	journal	October 2021
A Plasmoid model for the Sgr A* Flares Observed With Gravity and CHANDRA Ball, David; Özel, Feryal; Christian, Pierre The Astrophysical Journal, Vol. 917, Issue 1 https://doi.org/10.3847/1538-4357/abf8ae	journal	August 2021
Pinpointing the near-infrared location of Sgr A* by correcting optical distortion in the NACO imager Plewa, P. M.; Gillessen, S.; Eisenhauer, F. Monthly Notices of the Royal Astronomical Society, Vol. 453, Issue 3 https://doi.org/10.1093/mnras/stv1910	journal	September 2015
Gravitational Test beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole Psaltis, Dimitrios; Medeiros, Lia; Christian, Pierre Physical Review Letters, Vol. 125, Issue 14 https://doi.org/10.1103/PhysRevLett.125.141104	journal	October 2020
Transition from inspiral to plunge in binary black hole coalescences Buonanno, Alessandra; Damour, Thibault Physical Review D, Vol. 62, Issue 6 https://doi.org/10.1103/PhysRevD.62.064015	journal	August 2000
An Update on Monitoring Stellar Orbits in the Galactic Center Gillessen, S.; Plewa, P. M.; Eisenhauer, F. The Astrophysical Journal, Vol. 837, Issue 1 https://doi.org/10.3847/1538-4357/aa5c41	journal	February 2017
An X‐Ray, Infrared, and Submillimeter Flare of Sagittarius A* Marrone, D. P.; Baganoff, F. K.; Morris, M. R. The Astrophysical Journal, Vol. 682, Issue 1 https://doi.org/10.1086/588806	journal	July 2008
The mean infrared emission of Sagittarius A* Schödel, R.; Morris, M. R.; Muzic, K. Astronomy & Astrophysics, Vol. 532 https://doi.org/10.1051/0004-6361/201116994	journal	July 2011
Viewing the Shadow of the Black Hole at the Galactic Center Falcke, Heino; Melia, Fulvio; Agol, Eric The Astrophysical Journal, Vol. 528, Issue 1 https://doi.org/10.1086/312423	journal	January 2000
Ab Initio Horizon-scale Simulations of Magnetically Arrested Accretion in Sagittarius A* Fed by Stellar Winds Ressler, Sean M.; White, Christopher J.; Quataert, Eliot The Astrophysical Journal, Vol. 896, Issue 1 https://doi.org/10.3847/2041-8213/ab9532	journal	June 2020
Stellar orbits near Sagittarius A Eckart, A.; Genzel, R.; Ott, T. Monthly Notices of the Royal Astronomical Society, Vol. 331, Issue 4 https://doi.org/10.1046/j.1365-8711.2002.05237.x	journal	April 2002
First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter The Astrophysical Journal Letters, Vol. 930, Issue 2 https://doi.org/10.3847/2041-8213/ac6736	journal	May 2022
Strong-Field Gravity Tests with the Double Pulsar Kramer, M.; Stairs, I. H.; Manchester, R. N. Physical Review X, Vol. 11, Issue 4 https://doi.org/10.1103/PhysRevX.11.041050	journal	December 2021
Galactic center research: manifestations of the central black hole Morris, Mark R.; Meyer, Leo; Ghez, Andrea M. Research in Astronomy and Astrophysics, Vol. 12, Issue 8 https://doi.org/10.1088/1674-4527/12/8/007	journal	August 2012
CHANDRA /HETGS OBSERVATIONS OF THE BRIGHTEST FLARE SEEN FROM Sgr A* Nowak, M. A.; Neilsen, J.; Markoff, S. B. The Astrophysical Journal, Vol. 759, Issue 2 https://doi.org/10.1088/0004-637X/759/2/95	journal	October 2012
FAR INFRARED VARIABILITY OF SAGITTARIUS A: 25.5 hr OF MONITORING WITH HERSCHEL* Stone, Jordan M.; Marrone, D. P.; Dowell, C. D. The Astrophysical Journal, Vol. 825, Issue 1 https://doi.org/10.3847/0004-637X/825/1/32	journal	June 2016
The Nature of Black Hole Shadows Bronzwaer, Thomas; Falcke, Heino The Astrophysical Journal, Vol. 920, Issue 2 https://doi.org/10.3847/1538-4357/ac1738	journal	October 2021
Advection-dominated accretion and the black hole event horizon Narayan, Ramesh; McClintock, Jeffrey E. New Astronomy Reviews, Vol. 51, Issue 10-12 https://doi.org/10.1016/j.newar.2008.03.002	journal	May 2008
Observing the effects of the event horizon in black holes Done, C.; Gierlinski, M. Monthly Notices of the Royal Astronomical Society, Vol. 342, Issue 4 https://doi.org/10.1046/j.1365-8711.2003.06614.x	journal	July 2003
Chandra Spectral and Timing Analysis of Sgr A*'s Brightest X-Ray Flares Haggard, Daryl; Nynka, Melania; Mon, Brayden The Astrophysical Journal, Vol. 886, Issue 2 https://doi.org/10.3847/1538-4357/ab4a7f	journal	November 2019
A CHANDRA /HETGS CENSUS OF X-RAY VARIABILITY FROM Sgr A* DURING 2012 Neilsen, J.; Nowak, M. A.; Gammie, C. The Astrophysical Journal, Vol. 774, Issue 1 https://doi.org/10.1088/0004-637X/774/1/42	journal	August 2013
Solar system expansion and strong equivalence principle as seen by the NASA MESSENGER mission Genova, Antonio; Mazarico, Erwan; Goossens, Sander Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-017-02558-1	journal	January 2018
Gravity Tests with Radio Pulsars Wex, Norbert; Kramer, Michael Universe, Vol. 6, Issue 9 https://doi.org/10.3390/universe6090156	journal	September 2020
The Bardeen model as a nonlinear magnetic monopole Ayón-Beato, Eloy; Garcı́a, Alberto Physics Letters B, Vol. 493, Issue 1-2 https://doi.org/10.1016/S0370-2693(00)01125-4	journal	November 2000
Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole Abuter, R.; Amorim, A.; Anugu, N. Astronomy & Astrophysics, Vol. 615 https://doi.org/10.1051/0004-6361/201833718	journal	July 2018
A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty Abuter, R.; Amorim, A.; Bauböck, M. Astronomy & Astrophysics, Vol. 625 https://doi.org/10.1051/0004-6361/201935656	journal	May 2019
SYMBA: An end-to-end VLBI synthetic data generation pipeline: Simulating Event Horizon Telescope observations of M 87 Roelofs, F.; Janssen, M.; Natarajan, I. Astronomy & Astrophysics, Vol. 636 https://doi.org/10.1051/0004-6361/201936622	journal	April 2020
Low significance of evidence for black hole echoes in gravitational wave data Westerweck, Julian; Nielsen, Alex B.; Fischer-Birnholtz, Ofek Physical Review D, Vol. 97, Issue 12 https://doi.org/10.1103/PhysRevD.97.124037	journal	June 2018
Tests of the universality of free fall for strongly self-gravitating bodies with radio pulsars Freire, Paulo C. C.; Kramer, Michael; Wex, Norbert Classical and Quantum Gravity, Vol. 29, Issue 18 https://doi.org/10.1088/0264-9381/29/18/184007	journal	August 2012
Nonperturbative strong-field effects in tensor-scalar theories of gravitation Damour, Thibault; Esposito-Farèse, Gilles Physical Review Letters, Vol. 70, Issue 15 https://doi.org/10.1103/PhysRevLett.70.2220	journal	April 1993
Hybrid Thermal‐Nonthermal Synchrotron Emission from Hot Accretion Flows Ozel, Feryal; Psaltis, Dimitrios; Narayan, Ramesh The Astrophysical Journal, Vol. 541, Issue 1 https://doi.org/10.1086/309396	journal	September 2000
Broad $K α$ iron line from accretion disks around traversable wormholes Bambi, Cosimo Physical Review D, Vol. 87, Issue 8 https://doi.org/10.1103/PhysRevD.87.084039	journal	April 2013
Distinguishing black holes from naked singularities through their accretion disc properties Joshi, Pankaj S.; Malafarina, Daniele; Narayan, Ramesh Classical and Quantum Gravity, Vol. 31, Issue 1 https://doi.org/10.1088/0264-9381/31/1/015002	journal	November 2013
Stellar disruption events support the existence of the black hole event horizon Lu, Wenbin; Kumar, Pawan; Narayan, Ramesh Monthly Notices of the Royal Astronomical Society, Vol. 468, Issue 1 https://doi.org/10.1093/mnras/stx542	journal	March 2017
Trigonometric Parallaxes of Massive Star-Forming Regions. vi. Galactic Structure, Fundamental Parameters, and Noncircular Motions Reid, M. J.; Menten, K. M.; Zheng, X. W. The Astrophysical Journal, Vol. 700, Issue 1 https://doi.org/10.1088/0004-637X/700/1/137	journal	June 2009
EVIDENCE FOR X-RAY SYNCHROTRON EMISSION FROM SIMULTANEOUS MID-INFRARED TO X-RAY OBSERVATIONS OF A STRONG Sgr A* FLARE Dodds-Eden, K.; Porquet, D.; Trap, G. The Astrophysical Journal, Vol. 698, Issue 1 https://doi.org/10.1088/0004-637X/698/1/676	journal	May 2009
FERMI BUBBLES INFLATED BY WINDS LAUNCHED FROM THE HOT ACCRETION FLOW IN SGR A* Mou, Guobin; Yuan, Feng; Bu, Defu The Astrophysical Journal, Vol. 790, Issue 2 https://doi.org/10.1088/0004-637X/790/2/109	journal	July 2014
An Improved Distance and mass Estimate for sgr a* from a Multistar Orbit Analysis Boehle, A.; Ghez, A. M.; Schödel, R. The Astrophysical Journal, Vol. 830, Issue 1 https://doi.org/10.3847/0004-637X/830/1/17	journal	October 2016
10--30 Micron Maps of the Central 5 Parsecs of the Galaxy: Heating of the Cavity and Neutral Gas Disk Telesco, C. M.; Davidson, J. A.; Werner, M. W. The Astrophysical Journal, Vol. 456 https://doi.org/10.1086/176678	journal	January 1996
Sagittarius ${\rm{A}}* $ High-energy X-Ray Flare Properties during NuStar Monitoring of the Galactic Center from 2012 to 2015 Zhang, Shuo; Baganoff, Frederick K.; Ponti, Gabriele The Astrophysical Journal, Vol. 843, Issue 2 https://doi.org/10.3847/1538-4357/aa74e8	journal	July 2017
Stellar Dynamics in the Central Arcsecond of Our Galaxy Schodel, R.; Ott, T.; Genzel, R. The Astrophysical Journal, Vol. 596, Issue 2 https://doi.org/10.1086/378122	journal	October 2003
The Variability of Sagittarius A* at Centimeter Wavelengths Herrnstein, Robeson M.; Zhao, Jun-Hui; Bower, Geoffrey C. The Astronomical Journal, Vol. 127, Issue 6 https://doi.org/10.1086/420711	journal	June 2004
Plasmoid formation in global GRMHD simulations and AGN flares Nathanail, Antonios; Fromm, Christian M.; Porth, Oliver Monthly Notices of the Royal Astronomical Society, Vol. 495, Issue 2 https://doi.org/10.1093/mnras/staa1165	journal	May 2020
The Event Horizon of m87 Broderick, Avery E.; Narayan, Ramesh; Kormendy, John The Astrophysical Journal, Vol. 805, Issue 2 https://doi.org/10.1088/0004-637X/805/2/179	journal	June 2015
Investigating the Binarity of S0-2: Implications for Its Origins and Robustness as a Probe of the Laws of Gravity around a Supermassive Black Hole Chu, Devin S.; Do, Tuan; Hees, Aurelien The Astrophysical Journal, Vol. 854, Issue 1 https://doi.org/10.3847/1538-4357/aaa3eb	journal	February 2018
Linearly polarized millimeter and submillimeter continuum emission of Sgr A* constrained by ALMA Liu, Hauyu Baobab; Wright, Melvyn C. H.; Zhao, Jun-Hui Astronomy & Astrophysics, Vol. 593 https://doi.org/10.1051/0004-6361/201628731	journal	September 2016
Probing beyond-Kerr spacetimes with inspiral-ringdown corrections to gravitational waves Carson, Zack; Yagi, Kent Physical Review D, Vol. 101, Issue 8 https://doi.org/10.1103/PhysRevD.101.084050	journal	April 2020
Regular black hole metric with three constants of motion Johannsen, Tim Physical Review D, Vol. 88, Issue 4 https://doi.org/10.1103/PhysRevD.88.044002	journal	August 2013
Geometric modeling of M87* as a Kerr black hole or a non-Kerr compact object Vincent, F. H.; Wielgus, M.; Abramowicz, M. A. Astronomy & Astrophysics, Vol. 646 https://doi.org/10.1051/0004-6361/202037787	journal	February 2021
Regular Black Hole in General Relativity Coupled to Nonlinear Electrodynamics Ayón-Beato, Eloy; García, Alberto Physical Review Letters, Vol. 80, Issue 23 https://doi.org/10.1103/PhysRevLett.80.5056	journal	June 1998

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