The SOUX AGN sample: SDSS– XMM-Newton optical, ultraviolet, and X-ray selected active galactic nuclei spanning a wide range of parameter space – sample definition
Abstract
Abstract We assemble a sample of 696 type 1 active galactic nuclei (AGN) up to a redshift of z = 2.5, all of which have an SDSS spectrum containing at least one broad emission line (H α, H β, or Mg ii) and an XMM-Newton X-ray spectrum containing at least 250 counts in addition to simultaneous optical/ultraviolet photometry from the XMM Optical Monitor. Our sample includes quasars and narrow-line Seyfert 1s: thus our AGN span a wide range in luminosity, black hole mass, and accretion rate. We determine single-epoch black hole mass relations for the three emission lines and find that they provide broadly consistent mass estimates whether the continuum or emission line luminosity is used as the proxy for the broad emission line region radius. We explore variations of the UV/X-ray energy index αox with the UV continuum luminosity and with black hole mass and accretion rate, and make comparisons to the physical quasar spectral energy distribution model qsosed. The majority of the AGN in our sample lie in a region of parameter space with 0.02 < L/LEdd < 2 as defined by this model, with narrow-line type 1 AGN offset to lower masses and higher accretion rates than typical broad-line quasars. Wemore »
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1924554
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 520 Journal Issue: 2; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Kynoch, Daniel, Mitchell, Jake A. J., Ward, Martin J., Done, Chris, Lusso, Elisabeta, and Landt, Hermine. The SOUX AGN sample: SDSS– XMM-Newton optical, ultraviolet, and X-ray selected active galactic nuclei spanning a wide range of parameter space – sample definition. United Kingdom: N. p., 2023.
Web. doi:10.1093/mnras/stad221.
Kynoch, Daniel, Mitchell, Jake A. J., Ward, Martin J., Done, Chris, Lusso, Elisabeta, & Landt, Hermine. The SOUX AGN sample: SDSS– XMM-Newton optical, ultraviolet, and X-ray selected active galactic nuclei spanning a wide range of parameter space – sample definition. United Kingdom. https://doi.org/10.1093/mnras/stad221
Kynoch, Daniel, Mitchell, Jake A. J., Ward, Martin J., Done, Chris, Lusso, Elisabeta, and Landt, Hermine. Fri .
"The SOUX AGN sample: SDSS– XMM-Newton optical, ultraviolet, and X-ray selected active galactic nuclei spanning a wide range of parameter space – sample definition". United Kingdom. https://doi.org/10.1093/mnras/stad221.
@article{osti_1924554,
title = {The SOUX AGN sample: SDSS– XMM-Newton optical, ultraviolet, and X-ray selected active galactic nuclei spanning a wide range of parameter space – sample definition},
author = {Kynoch, Daniel and Mitchell, Jake A. J. and Ward, Martin J. and Done, Chris and Lusso, Elisabeta and Landt, Hermine},
abstractNote = {Abstract We assemble a sample of 696 type 1 active galactic nuclei (AGN) up to a redshift of z = 2.5, all of which have an SDSS spectrum containing at least one broad emission line (H α, H β, or Mg ii) and an XMM-Newton X-ray spectrum containing at least 250 counts in addition to simultaneous optical/ultraviolet photometry from the XMM Optical Monitor. Our sample includes quasars and narrow-line Seyfert 1s: thus our AGN span a wide range in luminosity, black hole mass, and accretion rate. We determine single-epoch black hole mass relations for the three emission lines and find that they provide broadly consistent mass estimates whether the continuum or emission line luminosity is used as the proxy for the broad emission line region radius. We explore variations of the UV/X-ray energy index αox with the UV continuum luminosity and with black hole mass and accretion rate, and make comparisons to the physical quasar spectral energy distribution model qsosed. The majority of the AGN in our sample lie in a region of parameter space with 0.02 < L/LEdd < 2 as defined by this model, with narrow-line type 1 AGN offset to lower masses and higher accretion rates than typical broad-line quasars. We find differences in the dependence of αox on UV luminosity between both narrow/broad-line and radio-loud/quiet subsets of AGN: αox has a slightly weaker dependence on UV luminosity for broad-line AGN and radio-loud AGN have systematically harder αox.},
doi = {10.1093/mnras/stad221},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 520,
place = {United Kingdom},
year = {Fri Jan 20 00:00:00 EST 2023},
month = {Fri Jan 20 00:00:00 EST 2023}
}
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1093/mnras/stad221
https://doi.org/10.1093/mnras/stad221
Other availability
Search WorldCat to find libraries that may hold this journal
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.
Works referenced in this record:
The Chandra Deep Field North Survey. XIV. X-Ray–Detected Obscured AGN[CLC]s[/CLC] and Starburst Galaxies in the Bright Submillimeter Source Population
journal, February 2003
- Alexander, D. M.; Bauer, F. E.; Brandt, W. N.
- The Astronomical Journal, Vol. 125, Issue 2
The FIRST Survey: Faint Images of the Radio Sky at Twenty Centimeters
journal, September 1995
- Becker, Robert H.; White, Richard L.; Helfand, David J.
- The Astrophysical Journal, Vol. 450
The Sloan Digital Sky Survey Reverberation Mapping Project: Sample Characterization
journal, April 2019
- Shen, Yue; Hall, Patrick B.; Horne, Keith
- The Astrophysical Journal Supplement Series, Vol. 241, Issue 2
The Astropy Project: Building an Open-science Project and Status of the v2.0 Core Package
journal, August 2018
- Price-Whelan, A. M.; Sipőcz, B. M.; Günther, H. M.
- The Astronomical Journal, Vol. 156, Issue 3
VLA observations of objects in the Palomar Bright Quasar Survey
journal, October 1989
- Kellermann, K. I.; Sramek, R.; Schmidt, M.
- The Astronomical Journal, Vol. 98
Mean Spectral Energy Distributions and Bolometric Corrections for Luminous Quasars
journal, April 2013
- Krawczyk, Coleman M.; Richards, Gordon T.; Mehta, Sajjan S.
- The Astrophysical Journal Supplement Series, Vol. 206, Issue 1
Comparing Single-Epoch Virial Black hole mass Estimators for Luminous Quasars
journal, June 2012
- Shen, Yue; Liu, Xin
- The Astrophysical Journal, Vol. 753, Issue 2
A Fundamental Plane of black hole activity
journal, November 2003
- Merloni, A.; Heinz, S.; Di Matteo, T.
- Monthly Notices of the Royal Astronomical Society, Vol. 345, Issue 4
Bolometric correction factors for active galactic nuclei
journal, July 2019
- Netzer, Hagai
- Monthly Notices of the Royal Astronomical Society, Vol. 488, Issue 4
Broad-line Balmer decrements in blue active galactic nuclei
journal, December 2007
- Dong, Xiaobo; Wang, Tinggui; Wang, Jianguo
- Monthly Notices of the Royal Astronomical Society, Vol. 383, 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
Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
journal, June 2017
- Blanton, Michael R.; Bershady, Matthew A.; Abolfathi, Bela
- The Astronomical Journal, Vol. 154, Issue 1
A combined optical and X-ray study of unobscured type 1 active galactic nuclei - II. Relation between X-ray emission and optical spectra: A spectral study of type 1 AGNs - II
journal, April 2012
- Jin, Chichuan; Ward, Martin; Done, Chris
- Monthly Notices of the Royal Astronomical Society, Vol. 422, Issue 4
The near-infrared broad emission line region of active galactic nuclei - II. The 1-μm continuum: Near-IR BELR of AGN - II. The 1-μm continuum
journal, March 2011
- Landt, Hermine; Elvis, Martin; Ward, Martin J.
- Monthly Notices of the Royal Astronomical Society, Vol. 414, Issue 1
A two-phase model for the X-ray emission from Seyfert galaxies
journal, October 1991
- Haardt, F.; Maraschi, L.
- The Astrophysical Journal, Vol. 380
On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
journal, September 2016
- Landt, H.; Ward, M. J.; Baloković, M.
- Monthly Notices of the Royal Astronomical Society, Vol. 464, Issue 3
Emission-line profiles in Seyfert 1 galaxies
journal, May 1982
- Osterbrock, D. E.; Shuder, J. M.
- The Astrophysical Journal Supplement Series, Vol. 49
X-ray binary accretion states in active galactic nuclei? Sensing the accretion disc of supermassive black holes with mid-infrared nebular lines
journal, April 2021
- Fernández-Ontiveros, Juan A.; Muñoz-Darias, Teo
- Monthly Notices of the Royal Astronomical Society, Vol. 504, Issue 4
The near-infrared radius-luminosity relationship for active galactic nuclei
journal, March 2011
- Landt, Hermine; Bentz, Misty C.; Peterson, Bradley M.
- Monthly Notices of the Royal Astronomical Society: Letters, Vol. 413, Issue 1
The Radius‐Luminosity Relationship for Active Galactic Nuclei: The Effect of Host‐Galaxy Starlight on Luminosity Measurements
journal, June 2006
- Bentz, Misty C.; Peterson, Bradley M.; Pogge, Richard W.
- The Astrophysical Journal, Vol. 644, Issue 1
Reddening of the BLR and NLR in AGNs from a systematic analysis of Balmer decrement
journal, November 2018
- Lu, Kai-Xing; Zhao, Yinghe; Bai, Jin-Ming
- Monthly Notices of the Royal Astronomical Society, Vol. 483, Issue 2
HEALPix: A Framework for High‐Resolution Discretization and Fast Analysis of Data Distributed on the Sphere
journal, April 2005
- Gorski, K. M.; Hivon, E.; Banday, A. J.
- The Astrophysical Journal, Vol. 622, Issue 2
X-ray studies of quasars with the Einstein Observatory
journal, November 1979
- Tananbaum, H.; Avni, Y.; Branduardi, G.
- The Astrophysical Journal, Vol. 234
A Comprehensive Study of 2000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey. I. The Sample
journal, September 2006
- Zhou, Hongyan; Wang, Tinggui; Yuan, Weimin
- The Astrophysical Journal Supplement Series, Vol. 166, Issue 1
A combined optical and X-ray study of unobscured type 1 active galactic nuclei - III. Broad-band SED properties: A spectral study of type 1 AGNs - III
journal, August 2012
- Jin, Chichuan; Ward, Martin; Done, Chris
- Monthly Notices of the Royal Astronomical Society, Vol. 425, Issue 2
The Lx–Luv–Lradio relation and corona–disc–jet connection in optically selected radio-loud quasars
journal, June 2020
- Zhu (朱世甫), S. F.; Brandt, W. N.; Luo (罗斌), B.
- Monthly Notices of the Royal Astronomical Society, Vol. 496, Issue 1
The Analogous Structure of Accretion Flows in Supermassive and Stellar Mass Black Holes: New Insights from Faded Changing-look Quasars
journal, September 2019
- Ruan, John J.; Anderson, Scott F.; Eracleous, Michael
- The Astrophysical Journal, Vol. 883, Issue 1
Modelling the spectral energy distribution of super-Eddington quasars
journal, August 2019
- Kubota, Aya; Done, Chris
- Monthly Notices of the Royal Astronomical Society, Vol. 489, Issue 1
The NRAO VLA Sky Survey
journal, May 1998
- Condon, J. J.; Cotton, W. D.; Greisen, E. W.
- The Astronomical Journal, Vol. 115, Issue 5
The Tight Relation Between X-Ray and Ultraviolet Luminosity of Quasars
journal, March 2016
- Lusso, E.; Risaliti, G.
- The Astrophysical Journal, Vol. 819, Issue 2
QSFit: automatic analysis of optical AGN spectra
journal, September 2017
- Calderone, G.; Nicastro, L.; Ghisellini, G.
- Monthly Notices of the Royal Astronomical Society, Vol. 472, Issue 4
Quasars as standard candles: I. The physical relation between disc and coronal emission
journal, June 2017
- Lusso, E.; Risaliti, G.
- Astronomy & Astrophysics, Vol. 602
The lick agn Monitoring Project: Alternate Routes to a Broad-Line Region Radius
journal, October 2010
- Greene, Jenny E.; Hood, Carol E.; Barth, Aaron J.
- The Astrophysical Journal, Vol. 723, Issue 1
Radio-loud Narrow-Line Type 1 Quasars
journal, June 2006
- Komossa, Stefanie; Voges, Wolfgang; Xu, Dawei
- The Astronomical Journal, Vol. 132, Issue 2
Spectropolarimetry of 'narrow-line' Seyfert 1 galaxies
journal, July 1989
- Goodrich, Robert W.
- The Astrophysical Journal, Vol. 342
A physical model of the broad-band continuum of AGN and its implications for the UV/X relation and optical variability
journal, July 2018
- Kubota, Aya; Done, Chris
- Monthly Notices of the Royal Astronomical Society, Vol. 480, Issue 1
A Catalog of Quasar Properties from Sloan Digital sky Survey data Release 7
journal, June 2011
- Shen, Yue; Richards, Gordon T.; Strauss, Michael A.
- The Astrophysical Journal Supplement Series, Vol. 194, Issue 2
Spectral Classification of Quasars in the Sloan Digital Sky Survey: Eigenspectra, Redshift, and Luminosity Effects
journal, December 2004
- Yip, C. W.; Connolly, A. J.; Vanden Berk, D. E.
- The Astronomical Journal, Vol. 128, Issue 6
Calibration and Limitations of the Mg ii Line-based Black Hole Masses
journal, June 2018
- Woo, Jong-Hak; Le, Huynh Anh N.; Karouzos, Marios
- The Astrophysical Journal, Vol. 859, Issue 2
Do stellar-mass and super-massive black holes have similar dining habits?
journal, June 2020
- Arcodia, R.; Ponti, G.; Merloni, A.
- Astronomy & Astrophysics, Vol. 638
Constraints on the broad-line region properties and extinction in local Seyferts
journal, July 2016
- Schnorr-Müller, Allan; Davies, R. I.; Korista, K. T.
- Monthly Notices of the Royal Astronomical Society, Vol. 462, Issue 4
The case for cases B and C: intrinsic hydrogen line ratios of the broad-line region of active galactic nuclei, reddenings, and accretion disc sizes
journal, January 2017
- Martin Gaskell, C.
- Monthly Notices of the Royal Astronomical Society
The Sloan Digital sky Survey Reverberation Mapping Project: Ensemble Spectroscopic Variability of Quasar Broad Emission Lines
journal, September 2015
- Sun, Mouyuan; Trump, Jonathan R.; Shen, Yue
- The Astrophysical Journal, Vol. 811, Issue 1
The relationship between infrared, optical, and ultraviolet extinction
journal, October 1989
- Cardelli, Jason A.; Clayton, Geoffrey C.; Mathis, John S.
- The Astrophysical Journal, Vol. 345
The Nuclear Reddening Curve for Active Galactic Nuclei and the Shape of the Infrared to X‐Ray Spectral Energy Distribution
journal, November 2004
- Gaskell, C. Martin; Goosmann, Rene W.; Antonucci, Robert R. J.
- The Astrophysical Journal, Vol. 616, Issue 1
Accretion states and radio loudness in active galactic nuclei: analogies with X-ray binaries
journal, November 2006
- Kording, E. G.; Jester, S.; Fender, R.
- Monthly Notices of the Royal Astronomical Society, Vol. 372, Issue 3
Astropy: A community Python package for astronomy
journal, September 2013
- Robitaille, Thomas P.; Tollerud, Erik J.; Greenfield, Perry
- Astronomy & Astrophysics, Vol. 558
TheXMM-Newtonserendipitous ultraviolet source survey catalogue
journal, September 2012
- Page, M. J.; Brindle, C.; Talavera, A.
- Monthly Notices of the Royal Astronomical Society, Vol. 426, Issue 2
Estimating Black Hole Masses in Active Galaxies Using the Hα Emission Line
journal, September 2005
- Greene, Jenny E.; Ho, Luis C.
- The Astrophysical Journal, Vol. 630, Issue 1
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
Active galactic nuclei at z ∼ 1.5 – II. Black hole mass estimation by means of broad emission lines
journal, March 2016
- Mejía-Restrepo, J. E.; Trakhtenbrot, B.; Lira, P.
- Monthly Notices of the Royal Astronomical Society, Vol. 460, Issue 1
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
Detailed Analysis of Balmer Lines in a Sloan Digital Sky Survey Sample of 90 Broad‐Line Active Galactic Nuclei
journal, December 2007
- La Mura, G.; Popović, L. Č.; Ciroi, S.
- The Astrophysical Journal, Vol. 671, Issue 1
The ‘Big Dipper’: the nature of the extreme variability of the AGN SDSS J2232−0806
journal, February 2019
- Kynoch, Daniel; Ward, Martin J.; Lawrence, Andy
- Monthly Notices of the Royal Astronomical Society, Vol. 485, Issue 2
Towards a unified model for black hole X-ray binary jets
journal, December 2004
- Fender, R. P.; Belloni, T. M.; Gallo, E.
- Monthly Notices of the Royal Astronomical Society, Vol. 355, Issue 4
Black Hole Mass and Growth Rate at High Redshift
journal, December 2007
- Netzer, Hagai; Lira, Paulina; Trakhtenbrot, Benny
- The Astrophysical Journal, Vol. 671, Issue 2
Reaching the peak of the quasar spectral energy distribution – II. Exploring the accretion disc, dusty torus and host galaxy
journal, October 2016
- Collinson, James S.; Ward, Martin J.; Landt, Hermine
- Monthly Notices of the Royal Astronomical Society, Vol. 465, Issue 1
Explaining changing-look AGN with state transition triggered by rapid mass accretion rate drop
journal, August 2018
- Noda, Hirofumi; Done, Chris
- Monthly Notices of the Royal Astronomical Society, Vol. 480, Issue 3
Intrinsic disc emission and the soft X-ray excess in active galactic nuclei: The soft X-ray excess in AGN
journal, January 2012
- Done, Chris; Davis, S. W.; Jin, C.
- Monthly Notices of the Royal Astronomical Society, Vol. 420, Issue 3
The X-ray to optical-UV luminosity ratio of X-ray selected type 1 AGN in XMM-COSMOS
journal, March 2010
- Lusso, E.; Comastri, A.; Vignali, C.
- Astronomy and Astrophysics, Vol. 512
AGN spectral states from simultaneous UV and X-ray observations byXMM-Newton
journal, July 2017
- Svoboda, J.; Guainazzi, M.; Merloni, A.
- Astronomy & Astrophysics, Vol. 603
A combined optical and X-ray study of unobscured type 1 active galactic nuclei - I. Optical spectra and spectral energy distribution modelling: A spectral study of unobscured type 1 AGNs - I
journal, January 2012
- Jin, Chichuan; Ward, Martin; Done, Chris
- Monthly Notices of the Royal Astronomical Society, Vol. 420, Issue 3
Quasars as high-redshift standard candles
journal, July 2022
- Sacchi, A.; Risaliti, G.; Signorini, M.
- Astronomy & Astrophysics, Vol. 663
Distributions of Galaxy Spectral Types in the Sloan Digital Sky Survey
journal, August 2004
- Yip, C. W.; Connolly, A. J.; Szalay, A. S.
- The Astronomical Journal, Vol. 128, Issue 2
The spectra of narrow-line Seyfert 1 galaxies
journal, October 1985
- Osterbrock, D. E.; Pogge, R. W.
- The Astrophysical Journal, Vol. 297
Quasars as standard candles II: The non-linear relation between UV and X-ray emission at high redshifts
journal, November 2019
- Salvestrini, F.; Risaliti, G.; Bisogni, S.
- Astronomy & Astrophysics, Vol. 631
Do radio active galactic nuclei reflect X-ray binary spectral states?
journal, June 2022
- Moravec, Emily; Svoboda, Jiří; Borkar, Abhijeet
- Astronomy & Astrophysics, Vol. 662
On the Selection Effect of Radio Quasars in the Sloan Digital Sky Survey
journal, March 2007
- Lu, Yu; Wang, Tinggui; Zhou, Hongyan
- The Astronomical Journal, Vol. 133, Issue 4
Some Aspects of Measurement Error in Linear Regression of Astronomical Data
journal, August 2007
- Kelly, Brandon C.
- The Astrophysical Journal, Vol. 665, Issue 2
Reaching the peak of the quasar spectral energy distribution – I. Observations and models
journal, March 2015
- Collinson, James S.; Ward, Martin J.; Done, Chris
- Monthly Notices of the Royal Astronomical Society, Vol. 449, Issue 2
Understanding Broad Mg ii Variability in Quasars with Photoionization: Implications for Reverberation Mapping and Changing-look Quasars
journal, January 2020
- Guo, Hengxiao; Shen, Yue; He, Zhicheng
- The Astrophysical Journal, Vol. 888, Issue 2
astroquery : An Astronomical Web-querying Package in Python
journal, February 2019
- Ginsburg, Adam; Sipőcz, Brigitta M.; Brasseur, C. E.
- The Astronomical Journal, Vol. 157, Issue 3
The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS J1222+0413
journal, May 2019
- Kynoch, Daniel; Landt, Hermine; Ward, Martin J.
- Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 1
The Sloan Digital Sky Survey Quasar Catalog: Fourteenth data release
journal, May 2018
- Pâris, Isabelle; Petitjean, Patrick; Aubourg, Éric
- Astronomy & Astrophysics, Vol. 613
A catalogue of optical to X-ray spectral energy distributions of z ≈ 2 quasars observed with Swift – I. First results
journal, February 2017
- Lawther, D.; Vestergaard, M.; Raimundo, S.
- Monthly Notices of the Royal Astronomical Society, Vol. 467, Issue 4
A spectral decomposition of the variable optical, ultraviolet and X-ray continuum of NGC 5548
journal, November 1998
- Magdziarz, Paweł; Blaes, Omer M.; Zdziarski, Andrzej A.
- Monthly Notices of the Royal Astronomical Society, Vol. 301, Issue 1
The XMM-Newton serendipitous survey: IX. The fourth XMM-Newton serendipitous source catalogue
journal, September 2020
- Webb, N. A.; Coriat, M.; Traulsen, I.
- Astronomy & Astrophysics, Vol. 641
Soft X-Ray and Ultraviolet Emission Relations in Optically Selected AGN Samples
journal, August 2005
- Strateva, Iskra V.; Brandt, W. N.; Schneider, Donald P.
- The Astronomical Journal, Vol. 130, Issue 2
Relation between the Variations in the Mg ii λ 2798 Emission Line and 3000 Å Continuum
journal, June 2017
- Zhu, Dongchun; Sun, Mouyuan; Wang, Tinggui
- The Astrophysical Journal, Vol. 843, Issue 1
Is the soft excess in active galactic nuclei real?
journal, March 2004
- Gierliński, Marek; Done, Chris
- Monthly Notices of the Royal Astronomical Society, Vol. 349, Issue 1
Spectral Properties of Quasars from Sloan Digital Sky Survey Data Release 14: The Catalog
journal, July 2020
- Rakshit, Suvendu; Stalin, C. S.; Kotilainen, Jari
- The Astrophysical Journal Supplement Series, Vol. 249, Issue 1
Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
journal, April 2006
- Vestergaard, Marianne; Peterson, Bradley M.
- The Astrophysical Journal, Vol. 641, Issue 2
Constraining sub-parsec binary supermassive black holes in quasars with multi-epoch spectroscopy – III. Candidates from continued radial velocity tests
journal, October 2018
- Guo, Hengxiao; Liu, Xin; Shen, Yue
- Monthly Notices of the Royal Astronomical Society, Vol. 482, Issue 3
Central Masses and Broad‐Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation‐Mapping Database
journal, October 2004
- Peterson, B. M.; Ferrarese, L.; Gilbert, K. M.
- The Astrophysical Journal, Vol. 613, Issue 2
A Catalog of Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Data Release 12
journal, April 2017
- Rakshit, Suvendu; Stalin, C. S.; Chand, Hum
- The Astrophysical Journal Supplement Series, Vol. 229, Issue 2