First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign
Abstract
We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 2013 April 1 and August 10, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign, the nearby BL Lac object was observed in both a quiescent and an elevated state. The broadband campaign includes observations with NuSTAR, MAGIC, VERITAS, the Fermi Large Area Telescope, Swift X-ray Telescope and UV Optical Telescope, various ground-based optical instruments, including the GASP-WEBT program, as well as radio observations by OVRO, Metsähovi, and the F-Gamma consortium. Some of the MAGIC observations were affected by a sand layer from the Saharan desert, and had to be corrected using event-by-event corrections derived with a Light Detection and Ranging (LIDAR) facility. This is the first time that LIDAR information is used to produce a physics result with Cherenkov Telescope data taken during adverse atmospheric conditions, and hence sets a precedent for the current and future ground-based gamma-ray instruments. The NuSTAR instrument provides unprecedented sensitivity in hard X-rays, showing the source to display a spectral energy distribution (SED) between 3 and 79 keV consistent with a log-parabolic spectrum and hard X-ray variability on hour timescales. None (of the fourmore »
- Authors:
-
- Stanford Univ., CA (United States). et al.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- Contributing Org.:
- NuSTAR Team; MAGIC Collaboration; VERITAS Collaboration; F-Gamma Consortium
- OSTI Identifier:
- 1221587
- Report Number(s):
- SLAC-PUB-16396
Journal ID: ISSN 1538-4357; arXiv:1509.04936
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 812; Journal Issue: 1; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astrophysics; ASTRO; GRQC
Citation Formats
Furniss, Amy. First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign. United States: N. p., 2015.
Web. doi:10.1088/0004-637X/812/1/65.
Furniss, Amy. First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign. United States. https://doi.org/10.1088/0004-637X/812/1/65
Furniss, Amy. Thu .
"First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign". United States. https://doi.org/10.1088/0004-637X/812/1/65. https://www.osti.gov/servlets/purl/1221587.
@article{osti_1221587,
title = {First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign},
author = {Furniss, Amy},
abstractNote = {We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 2013 April 1 and August 10, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign, the nearby BL Lac object was observed in both a quiescent and an elevated state. The broadband campaign includes observations with NuSTAR, MAGIC, VERITAS, the Fermi Large Area Telescope, Swift X-ray Telescope and UV Optical Telescope, various ground-based optical instruments, including the GASP-WEBT program, as well as radio observations by OVRO, Metsähovi, and the F-Gamma consortium. Some of the MAGIC observations were affected by a sand layer from the Saharan desert, and had to be corrected using event-by-event corrections derived with a Light Detection and Ranging (LIDAR) facility. This is the first time that LIDAR information is used to produce a physics result with Cherenkov Telescope data taken during adverse atmospheric conditions, and hence sets a precedent for the current and future ground-based gamma-ray instruments. The NuSTAR instrument provides unprecedented sensitivity in hard X-rays, showing the source to display a spectral energy distribution (SED) between 3 and 79 keV consistent with a log-parabolic spectrum and hard X-ray variability on hour timescales. None (of the four extended NuSTAR observations) show evidence of the onset of inverse-Compton emission at hard X-ray energies. We apply a single-zone equilibrium synchrotron self-Compton (SSC) model to five simultaneous broadband SEDs. We find that the SSC model can reproduce the observed broadband states through a decrease in the magnetic field strength coinciding with an increase in the luminosity and hardness of the relativistic leptons responsible for the high-energy emission.},
doi = {10.1088/0004-637X/812/1/65},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 812,
place = {United States},
year = {Thu Oct 08 00:00:00 EDT 2015},
month = {Thu Oct 08 00:00:00 EDT 2015}
}
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Works referenced in this record:
INSIGHTS INTO THE HIGH-ENERGY γ-RAY EMISSION OF MARKARIAN 501 FROM EXTENSIVE MULTIFREQUENCY OBSERVATIONS IN THE FERMI ERA
journal, January 2011
- Abdo, A. A.; Ackermann, M.; Ajello, M.
- The Astrophysical Journal, Vol. 727, Issue 2
ERRATUM: “MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER” (2011, ApJ, 726, 43)
journal, March 2011
- Abdo, A. A.; Ackermann, M.; Ajello, M.
- The Astrophysical Journal, Vol. 731, Issue 1
Multi-Wavelength Observations of the Flaring Gamma-Ray Blazar 3c 66a in 2008 October
journal, December 2010
- Abdo, A. A.; Ackermann, M.; Ajello, M.
- The Astrophysical Journal, Vol. 726, Issue 1
MULTIWAVELENGTH OBSERVATIONS OF A TeV-FLARE FROM W COMAE
journal, November 2009
- Acciari, V. A.; Aliu, E.; Aune, T.
- The Astrophysical Journal, Vol. 707, Issue 1
Discovery of very high Energy Gamma-Ray Radiation from the bl lac 1es 0806+524
journal, December 2008
- Acciari, V.; Aliu, E.; Arlen, T.
- The Astrophysical Journal, Vol. 690, Issue 2
Simultaneous Multiwavelength Observations of Markarian 421 During Outburst
journal, August 2009
- Acciari, V. A.; Aliu, E.; Aune, T.
- The Astrophysical Journal, Vol. 703, Issue 1
Spectral Energy Distribution of Markarian 501: Quiescent State Versus Extreme Outburst
journal, February 2011
- Acciari, V. A.; Arlen, T.; Aune, T.
- The Astrophysical Journal, Vol. 729, Issue 1
VERITAS Observations of the γ‐Ray Binary LS I +61 303
journal, June 2008
- Acciari, V. A.; Beilicke, M.; Blaylock, G.
- The Astrophysical Journal, Vol. 679, Issue 2
VERITAS Discovery of >200 GeV Gamma-Ray Emission from the Intermediate-Frequency-Peaked BL Lacertae Object W Comae
journal, August 2008
- Acciari, V. A.; Aliu, E.; Beilicke, M.
- The Astrophysical Journal, Vol. 684, Issue 2
Variable Very High Energy γ‐Ray Emission from Markarian 501
journal, November 2007
- Albert, J.; Aliu, E.; Anderhub, H.
- The Astrophysical Journal, Vol. 669, Issue 2
Implementation of the Random Forest method for the Imaging Atmospheric Cherenkov Telescope MAGIC
journal, April 2008
- Albert, J.; Aliu, E.; Anderhub, H.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 588, Issue 3
VHE γ‐Ray Observation of the Crab Nebula and its Pulsar with the MAGIC Telescope
journal, February 2008
- Albert, J.; Aliu, E.; Anderhub, H.
- The Astrophysical Journal, Vol. 674, Issue 2
The 2009 multiwavelength campaign on Mrk 421: Variability and correlation studies
journal, April 2015
- Aleksić, J.; Ansoldi, S.; Antonelli, L. A.
- Astronomy & Astrophysics, Vol. 576
Multiwavelength observations of Mrk 501 in 2008
journal, December 2014
- Aleksić, J.; Ansoldi, S.; Antonelli, L. A.
- Astronomy & Astrophysics, Vol. 573
Search for an extended VHE γ -ray emission from Mrk 421 and Mrk 501 with the MAGIC Telescope
journal, November 2010
- Aleksić, J.; Antonelli, L. A.; Antoranz, P.
- Astronomy & Astrophysics, Vol. 524
Performance of the MAGIC stereo system obtained with Crab Nebula data
journal, February 2012
- Aleksić, J.; Alvarez, E. A.; Antonelli, L. A.
- Astroparticle Physics, Vol. 35, Issue 7
First broadband characterization and redshift determination of the VHE blazar MAGIC J2001+439
journal, December 2014
- Aleksić, J.; Ansoldi, S.; Antonelli, L. A.
- Astronomy & Astrophysics, Vol. 572
Multiwavelength Observations of the Previously Unidentified Blazar rx J0648.7+1516
journal, November 2011
- Aliu, E.; Aune, T.; Beilicke, M.
- The Astrophysical Journal, Vol. 742, Issue 2
Discovery of High-Energy and very high Energy γ-Ray Emission from the Blazar rbs 0413
journal, April 2012
- Aliu, E.; Archambault, S.; Arlen, T.
- The Astrophysical Journal, Vol. 750, Issue 2
MULTIWAVELENGTH OBSERVATIONS OF THE AGN 1ES 0414+009 WITH VERITAS, FERMI -LAT, SWIFT -XRT, AND MDM
journal, August 2012
- Aliu, E.; Archambault, S.; Arlen, T.
- The Astrophysical Journal, Vol. 755, Issue 2
Long term Observations of b2 1215+30 with Veritas
journal, November 2013
- Aliu, E.; Archambault, S.; Arlen, T.
- The Astrophysical Journal, Vol. 779, Issue 2
SIMULTANEOUS MULTIWAVELENGTH OBSERVATION OF Mkn 501 IN A LOW STATE IN 2006
journal, October 2009
- Anderhub, H.; Antonelli, L. A.; Antoranz, P.
- The Astrophysical Journal, Vol. 705, Issue 2
THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
journal, May 2009
- Atwood, W. B.; Abdo, A. A.; Ackermann, M.
- The Astrophysical Journal, Vol. 697, Issue 2
On the gamma-ray emission from 3C 279
journal, January 1993
- Bednarek, W.
- The Astrophysical Journal, Vol. 402
Bremsstrahlung, Synchrotron Radiation, and Compton Scattering of High-Energy Electrons Traversing Dilute Gases
journal, April 1970
- Blumenthal, George R.; Gould, Robert J.
- Reviews of Modern Physics, Vol. 42, Issue 2
LEPTONIC AND HADRONIC MODELING OF FERMI -DETECTED BLAZARS
journal, April 2013
- Böttcher, M.; Reimer, A.; Sweeney, K.
- The Astrophysical Journal, Vol. 768, Issue 1
X‐Ray Spectral Variability Signatures of Flares in BL Lacertae Objects
journal, December 2002
- Bottcher, Markus; Chiang, James
- The Astrophysical Journal, Vol. 581, Issue 1
Multiwavelength Observations of a Flare from Markarian 501
journal, October 1997
- Catanese, M.; Bradbury, S. M.; Breslin, A. C.
- The Astrophysical Journal, Vol. 487, Issue 2
GAMMA-RAY BLAZARS NEAR EQUIPARTITION AND THE ORIGIN OF THE GeV SPECTRAL BREAK IN 3C 454.3
journal, June 2013
- Cerruti, Matteo; Dermer, Charles D.; Lott, Benoît
- The Astrophysical Journal, Vol. 771, Issue 1
Equipartition Gamma-Ray Blazars and the Location of the Gamma-Ray Emission site in 3c 279
journal, January 2014
- Dermer, Charles D.; Cerruti, Matteo; Lott, Benoit
- The Astrophysical Journal, Vol. 782, Issue 2
Extragalactic background light inferred from AEGIS galaxy-SED-type fractions: EBL from AEGIS galaxy-SED-type fractions
journal, October 2010
- Domínguez, A.; Primack, J. R.; Rosario, D. J.
- Monthly Notices of the Royal Astronomical Society, Vol. 410, Issue 4
The discrete correlation function - A new method for analyzing unevenly sampled variability data
journal, October 1988
- Edelson, R. A.; Krolik, J. H.
- The Astrophysical Journal, Vol. 333
Correcting for the Effects of Interstellar Extinction
journal, January 1999
- Fitzpatrick, Edward L.
- Publications of the Astronomical Society of the Pacific, Vol. 111, Issue 755
New methods of atmospheric Cherenkov imaging for gamma-ray astronomy. I. The false source method
journal, May 1994
- Fomin, V. P.; Stepanian, A. A.; Lamb, R. C.
- Astroparticle Physics, Vol. 2, Issue 2
Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71: III. Rapid and correlated flux density variability from radio to sub-mm bands
journal, September 2008
- Fuhrmann, L.; Krichbaum, T. P.; Witzel, A.
- Astronomy & Astrophysics, Vol. 490, Issue 3
Simultaneous Radio to (Sub-) mm-Monitoring of Variability and Spectral Shape Evolution of potential GLAST Blazars
conference, January 2007
- Fuhrmann, L.; Zensus, J. A.; Krichbaum, T. P.
- THE FIRST GLAST SYMPOSIUM, AIP Conference Proceedings
The Swift Gamma‐Ray Burst Mission
journal, August 2004
- Gehrels, N.; Chincarini, G.; Giommi, P.
- The Astrophysical Journal, Vol. 611, Issue 2
Long‐Term X‐Ray and TeV Variability of Mrk 501
journal, July 2006
- Gliozzi, M.; Sambruna, R. M.; Jung, I.
- The Astrophysical Journal, Vol. 646, Issue 1
THE NUCLEAR SPECTROSCOPIC TELESCOPE ARRAY ( NuSTAR ) HIGH-ENERGY X-RAY MISSION
journal, May 2013
- Harrison, Fiona A.; Craig, William W.; Christensen, Finn E.
- The Astrophysical Journal, Vol. 770, Issue 2
The first VERITAS telescope
journal, July 2006
- Holder, J.; Atkins, R. W.; Badran, H. M.
- Astroparticle Physics, Vol. 25, Issue 6
The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with
improved stray-radiation corrections
journal, September 2005
- Kalberla, P. M. W.; Burton, W. B.; Hartmann, Dap
- Astronomy & Astrophysics, Vol. 440, Issue 2
High‐Energy Emission from the TeV Blazar Markarian 501 during Multiwavelength Observations in 1996
journal, March 1999
- Kataoka, J.; Mattox, J. R.; Quinn, J.
- The Astrophysical Journal, Vol. 514, Issue 1
Correlation between the TeV and X-ray emission in high-energy peaked BL Lac objects
journal, March 2005
- Katarzyński, K.; Ghisellini, G.; Tavecchio, F.
- Astronomy & Astrophysics, Vol. 433, Issue 2
Analysis methods for results in gamma-ray astronomy
journal, September 1983
- Li, T. -P.; Ma, Y. -Q.
- The Astrophysical Journal, Vol. 272
Emitting Electrons and Source Activity in Markarian 501
journal, June 2012
- Mankuzhiyil, Nijil; Ansoldi, Stefano; Persic, Massimo
- The Astrophysical Journal, Vol. 753, Issue 2
A jet model for the gamma-ray emitting blazar 3C 279
journal, September 1992
- Maraschi, L.; Ghisellini, G.; Celotti, A.
- The Astrophysical Journal, Vol. 397
Models for high-frequency radio outbursts in extragalactic sources, with application to the early 1983 millimeter-to-infrared flare of 3C 273
journal, November 1985
- Marscher, A. P.; Gear, W. K.
- The Astrophysical Journal, Vol. 298
Log-parabolic spectra and particle acceleration in blazars: II. The BeppoSAX wide band X-ray spectra of Mkn 501
journal, July 2004
- Massaro, E.; Perri, M.; Giommi, P.
- Astronomy & Astrophysics, Vol. 422, Issue 1
Log-parabolic spectra and particle acceleration in the BL Lac object Mkn 421: Spectral analysis of the complete BeppoSAX wide band X-ray data set
journal, December 2003
- Massaro, E.; Perri, M.; Giommi, P.
- Astronomy & Astrophysics, Vol. 413, Issue 2
The Likelihood Analysis of EGRET Data
journal, April 1996
- Mattox, J. R.; Bertsch, D. L.; Chiang, J.
- The Astrophysical Journal, Vol. 461
Host galaxy subtraction of TeV candidate BL Lacertae objects
journal, September 2007
- Nilsson, K.; Pasanen, M.; Takalo, L. O.
- Astronomy & Astrophysics, Vol. 475, Issue 1
FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG
journal, March 2012
- Nolan, P. L.; Abdo, A. A.; Ackermann, M.
- The Astrophysical Journal Supplement Series, Vol. 199, Issue 2
Multiwavelength Observations of Markarian 501 during the 1997 High State
journal, June 2000
- Petry, D.; Bottcher, M.; Connaughton, V.
- The Astrophysical Journal, Vol. 536, Issue 2
[ITAL]BeppoSAX[/ITAL] Observations of Unprecedented Synchrotron Activity in the BL Lacertae Object Markarian 501
journal, January 1998
- Pian, Elena; Vacanti, Giuseppe; Tagliaferri, Gianpiero
- The Astrophysical Journal, Vol. 492, Issue 1
Photometric calibration of the Swift ultraviolet/optical telescope: Photometric calibration of the Swift UVOT
journal, December 2007
- Poole, T. S.; Breeveld, A. A.; Page, M. J.
- Monthly Notices of the Royal Astronomical Society, Vol. 383, Issue 2
Detection of Gamma Rays with [ITAL]E[/ITAL] ] 300 GeV from Markarian 501
journal, January 1996
- Quinn,, J.; Akerlof,, C. W.; Biller,, S.
- The Astrophysical Journal, Vol. 456, Issue 2
BLAZARS IN THE FERMI ERA: THE OVRO 40 m TELESCOPE MONITORING PROGRAM
journal, May 2011
- Richards, Joseph L.; Max-Moerbeck, Walter; Pavlidou, Vasiliki
- The Astrophysical Journal Supplement Series, Vol. 194, Issue 2
Measuring Reddening with Sloan Digital sky Survey Stellar Spectra and Recalibrating sfd
journal, August 2011
- Schlafly, Edward F.; Finkbeiner, Douglas P.
- The Astrophysical Journal, Vol. 737, Issue 2
Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds
journal, June 1998
- Schlegel, David J.; Finkbeiner, Douglas P.; Davis, Marc
- The Astrophysical Journal, Vol. 500, Issue 2
Comptonization of diffuse ambient radiation by a relativistic jet: The source of gamma rays from blazars?
journal, January 1994
- Sikora, Marek; Begelman, Mitchell C.; Rees, Martin J.
- The Astrophysical Journal, Vol. 421
Relativistic Reconnection: an Efficient Source of Non-Thermal Particles
journal, February 2014
- Sironi, Lorenzo; Spitkovsky, Anatoly
- The Astrophysical Journal, Vol. 783, Issue 1
On the Momentum Diffusion of Radiating Ultrarelativistic Electrons in a Turbulent Magnetic Field
journal, July 2008
- Stawarz, Łukasz; Petrosian, Vahe
- The Astrophysical Journal, Vol. 681, Issue 2
SWIFT X-RAY TELESCOPE MONITORING OF FERMI -LAT GAMMA-RAY SOURCES OF INTEREST
journal, July 2013
- Stroh, Michael C.; Falcone, Abe D.
- The Astrophysical Journal Supplement Series, Vol. 207, Issue 2
[ITAL]ASCA[/ITAL] Observation of an X-Ray/TeV Flare from the BL Lacertae Object Markarian 421
journal, October 1996
- Takahashi, T.; Tashiro, M.; Madejski, G.
- The Astrophysical Journal, Vol. 470, Issue 2
On the origin of the γ -ray emission from the flaring blazar PKS 1222+216
journal, October 2011
- Tavecchio, F.; Becerra-Gonzalez, J.; Ghisellini, G.
- Astronomy & Astrophysics, Vol. 534
Fifteen years monitoring of extragalactic radio sources at 22, 37 and 87 GHz
journal, November 1998
- Teräsranta, H.; Tornikoski, M.; Mujunen, A.
- Astronomy and Astrophysics Supplement Series, Vol. 132, Issue 3
SWIFT observations of TeV BL Lacertae objects
journal, February 2007
- Tramacere, A.; Giommi, P.; Massaro, E.
- Astronomy & Astrophysics, Vol. 467, Issue 2
Unified Schemes for Radio-Loud Active Galactic Nuclei
journal, June 1995
- Urry, C. Megan; Padovani, Paolo
- Publications of the Astronomical Society of the Pacific, Vol. 107
On characterizing the variability properties of X-ray light curves from active galaxies
journal, November 2003
- Vaughan, S.; Edelson, R.; Warwick, R. S.
- Monthly Notices of the Royal Astronomical Society, Vol. 345, Issue 4
The GASP-WEBT monitoring of 3C 454.3 during the 2008 optical-to-radio and γ-ray outburst
journal, August 2009
- Villata, M.; Raiteri, C. M.; Gurwell, M. A.
- Astronomy & Astrophysics, Vol. 504, Issue 3
BVR photometry of comparison stars in selected blazar fields : I. Photometric sequences for 10 BL Lacertae objects
journal, June 1998
- Villata, M.; Raiteri, C. M.; Lanteri, L.
- Astronomy and Astrophysics Supplement Series, Vol. 130, Issue 2
Multifrequency monitoring of the blazar 0716+714 during the GASP-WEBT-AGILE campaign of 2007
journal, February 2008
- Villata, M.; Raiteri, C. M.; Larionov, V. M.
- Astronomy & Astrophysics, Vol. 481, Issue 2
Works referencing / citing this record:
The TANAMI Multiwavelength Program: Dynamic spectral energy distributions of southern blazars
journal, June 2016
- Krauß, F.; Wilms, J.; Kadler, M.
- Astronomy & Astrophysics, Vol. 591
Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009
journal, July 2017
- Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
- Astronomy & Astrophysics, Vol. 603
Hard X-ray properties of NuSTAR blazars
journal, November 2018
- Bhatta, Gopal; Mohorian, Maksym; Bilinsky, Illya
- Astronomy & Astrophysics, Vol. 619
Extreme HBL behavior of Markarian 501 during 2012
journal, December 2018
- Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
- Astronomy & Astrophysics, Vol. 620
Study of the variable broadband emission of Markarian 501 during the most extreme Swift X-ray activity
journal, May 2020
- Acciari, V. A.; Ansoldi, S.; Antonelli, L. A.
- Astronomy & Astrophysics, Vol. 637
The prolonged X-ray flaring activity of Mrk 501 in 2014
journal, April 2017
- Kapanadze, B.; Dorner, D.; Romano, P.
- Monthly Notices of the Royal Astronomical Society, Vol. 469, Issue 2
Blazar Mrk 501 shows rhythmic oscillations in its γ-ray emission
journal, May 2019
- Bhatta, Gopal
- Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 3
Sub-Hour X-Ray Variability of High-Energy Peaked BL Lacertae Objects
journal, March 2018
- Kapanadze, Bidzina
- Galaxies, Vol. 6, Issue 1
Fractional Variability—A Tool to Study Blazar Variability
journal, May 2019
- Schleicher, Bernd; Arbet-Engels, Axel; Baack, Dominik
- Galaxies, Vol. 7, Issue 2
Mrk 421 after the Giant X-Ray Outburst in 2013
journal, October 2017
- Kapanadze, B.; Dorner, D.; Romano, P.
- The Astrophysical Journal, Vol. 848, Issue 2
Extremely Rapid X-Ray Flares of TeV Blazars in the RXTE Era
journal, January 2018
- Zhu, S. F.; Xue, Y. Q.; Brandt, W. N.
- The Astrophysical Journal, Vol. 853, Issue 1
Swift Observations of Mrk 421 in Selected Epochs. I. The Spectral and Flux Variability in 2005–2008
journal, February 2018
- Kapanadze, B.; Vercellone, S.; Romano, P.
- The Astrophysical Journal, Vol. 854, Issue 1
Swift Observations of Mrk 421 in Selected Epochs. II. An Extreme Spectral Flux Variability in 2009–2012
journal, May 2018
- Kapanadze, B.; Vercellone, S.; Romano, P.
- The Astrophysical Journal, Vol. 858, Issue 2
X-Ray Flux and Spectral Variability of Six TeV Blazars with NuSTAR
journal, May 2018
- Pandey, Ashwani; Gupta, Alok C.; Wiita, Paul J.
- The Astrophysical Journal, Vol. 859, Issue 1
Strong X-Ray and Multiwavelength Flaring Activity for 1ES 1959+650, 2016 August–2017 November
journal, September 2018
- Kapanadze, B.; Dorner, D.; Vercellone, S.
- The Astrophysical Journal Supplement Series, Vol. 238, Issue 1
Fractional variability—a tool to study blazar variability
text, January 2019
- Schleicher, Bernd; Arbet-Engels, Axel; Baack, Dominik
- Technische Universität Dortmund
Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009
text, January 2017
- Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
The extreme HBL behaviour of Markarian 501 during 2012
text, January 2018
- Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Fractional Variability—A Tool to Study Blazar Variability
text, January 2019
- Schleicher, Bernd; Arbet-Engels, Axel; Baack, Dominik
- ETH Zurich
Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009
text, January 2016
- Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
- arXiv
Extremely rapid x-ray flares of tev blazars in the rxte era
text, January 2017
- Zhu, S. F.; Xue, Y. Q.; Brandt, W. N.
- arXiv