Exploring the diversity of Type 1 active galactic nuclei identified in SDSS-IV/SPIDERS
Abstract
ABSTRACT We present a statistical analysis of the optical properties of an X-ray-selected Type 1 active galactic nucleus (AGN) sample, using high signal-to-noise ratio (S/N>20) spectra of the counterparts of the ROSAT/2RXS sources in the footprint of the SDSS-IV/SPIDERS (Spectroscopic IDentification of eROSITA Sources) programme. The final sample contains 2100 sources. It significantly extends the redshift and luminosity ranges (z ∼ 0.01–0.80 and $$L_{\rm 0.1\!-\!2.4 \, keV} \sim \rm 2.0 \times 10^{41}\!-\!1.0 \times 10^{46} \, \, erg \, s^{-1}$$) used so far in this kind of analysis. By means of a principal component analysis, we derive eigenvector (EV) 1 and 2 in an eleven-dimensional optical and X-ray parameter space, which are consistent with previous results. The validity of the correlations of the Eddington ratio L/LEdd with EV1 and the black hole mass with EV2 is strongly confirmed. These results imply that L/LEdd and black hole mass are related to the diversity of the optical properties of Type 1 AGNs. Investigating the relation of the width and asymmetry of H β and the relative strength of the iron emission $$r_{\rm Fe\, \small{II}}$$, we show that our analysis supports the presence of a distinct kinematic region: the very broad line region. Furthermore, comparing sources with a red-asymmetric broad H β emission line to sources for which it is blue asymmetric, we find an intriguing difference in the correlation of the $$\rm Fe\, \small{II}$$ and the continuum emission strengths. We show that this contrasting behaviour is consistent with a flattened, stratified model of the broad-line region, in which the $$\rm Fe\, \small{II}$$-emitting region is shielded from the central source.
- Authors:
-
[1];
- Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, D-85748 Garching, Germany
- School of Physics and Astronomy, Tel-Aviv University, Tel Aviv 69978, Israel
- Instituto de Física de Cantabria (CSIC-Universidad de Cantabria), E-39005 Santander, Spain
- Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA, Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1595149
- 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: 492 Journal Issue: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Wolf, Julien, Salvato, Mara, Coffey, Damien, Merloni, Andrea, Buchner, Johannes, Arcodia, Riccardo, Baron, Dalya, Carrera, Francisco J., Comparat, Johan, Schneider, Donald P., and Nandra, Kirpal. Exploring the diversity of Type 1 active galactic nuclei identified in SDSS-IV/SPIDERS. United Kingdom: N. p., 2020.
Web. doi:10.1093/mnras/staa018.
Wolf, Julien, Salvato, Mara, Coffey, Damien, Merloni, Andrea, Buchner, Johannes, Arcodia, Riccardo, Baron, Dalya, Carrera, Francisco J., Comparat, Johan, Schneider, Donald P., & Nandra, Kirpal. Exploring the diversity of Type 1 active galactic nuclei identified in SDSS-IV/SPIDERS. United Kingdom. https://doi.org/10.1093/mnras/staa018
Wolf, Julien, Salvato, Mara, Coffey, Damien, Merloni, Andrea, Buchner, Johannes, Arcodia, Riccardo, Baron, Dalya, Carrera, Francisco J., Comparat, Johan, Schneider, Donald P., and Nandra, Kirpal. Wed .
"Exploring the diversity of Type 1 active galactic nuclei identified in SDSS-IV/SPIDERS". United Kingdom. https://doi.org/10.1093/mnras/staa018.
@article{osti_1595149,
title = {Exploring the diversity of Type 1 active galactic nuclei identified in SDSS-IV/SPIDERS},
author = {Wolf, Julien and Salvato, Mara and Coffey, Damien and Merloni, Andrea and Buchner, Johannes and Arcodia, Riccardo and Baron, Dalya and Carrera, Francisco J. and Comparat, Johan and Schneider, Donald P. and Nandra, Kirpal},
abstractNote = {ABSTRACT We present a statistical analysis of the optical properties of an X-ray-selected Type 1 active galactic nucleus (AGN) sample, using high signal-to-noise ratio (S/N>20) spectra of the counterparts of the ROSAT/2RXS sources in the footprint of the SDSS-IV/SPIDERS (Spectroscopic IDentification of eROSITA Sources) programme. The final sample contains 2100 sources. It significantly extends the redshift and luminosity ranges (z ∼ 0.01–0.80 and $L_{\rm 0.1\!-\!2.4 \, keV} \sim \rm 2.0 \times 10^{41}\!-\!1.0 \times 10^{46} \, \, erg \, s^{-1}$) used so far in this kind of analysis. By means of a principal component analysis, we derive eigenvector (EV) 1 and 2 in an eleven-dimensional optical and X-ray parameter space, which are consistent with previous results. The validity of the correlations of the Eddington ratio L/LEdd with EV1 and the black hole mass with EV2 is strongly confirmed. These results imply that L/LEdd and black hole mass are related to the diversity of the optical properties of Type 1 AGNs. Investigating the relation of the width and asymmetry of H β and the relative strength of the iron emission $r_{\rm Fe\, \small{II}}$, we show that our analysis supports the presence of a distinct kinematic region: the very broad line region. Furthermore, comparing sources with a red-asymmetric broad H β emission line to sources for which it is blue asymmetric, we find an intriguing difference in the correlation of the $\rm Fe\, \small{II}$ and the continuum emission strengths. We show that this contrasting behaviour is consistent with a flattened, stratified model of the broad-line region, in which the $\rm Fe\, \small{II}$-emitting region is shielded from the central source.},
doi = {10.1093/mnras/staa018},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 492,
place = {United Kingdom},
year = {Wed Jan 08 00:00:00 EST 2020},
month = {Wed Jan 08 00:00:00 EST 2020}
}
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1093/mnras/staa018
https://doi.org/10.1093/mnras/staa018
Other availability
Search WorldCat to find libraries that may hold this journal
Cited by: 10 works
Citation information provided by
Web of Science
Web of Science
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 Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point Observatory Galactic Evolution Experiment
journal, April 2018
- Abolfathi, Bela; Aguado, D. S.; Aguilar, Gabriela
- The Astrophysical Journal Supplement Series, Vol. 235, Issue 2
Black Hole Mass Estimates from Reverberation Mapping and from Spatially Resolved Kinematics
journal, November 2000
- Gebhardt, Karl; Kormendy, John; Ho, Luis C.
- The Astrophysical Journal, Vol. 543, Issue 1
Contribution of the disk emission to the broad emission lines in
AGNs: Two-component model
journal, August 2004
- Popović, L. Č.; Mediavilla, E.; Bon, E.
- Astronomy & Astrophysics, Vol. 423, Issue 3
The Relationship between Luminosity and Broad‐Line Region Size in Active Galactic Nuclei
journal, August 2005
- Kaspi, Shai; Maoz, Dan; Netzer, Hagai
- The Astrophysical Journal, Vol. 629, Issue 1
Quasar Massive Ionized Outflows Traced by CIV λ1549 and [OIII]λλ4959,5007
journal, September 2017
- Marziani, Paola; Negrete, C. Alenka; Dultzin, Deborah
- Frontiers in Astronomy and Space Sciences, Vol. 4
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
On the Time Dependence of Emission-Line Strengths from a Photoionized Nebula
journal, January 1972
- Bahcall, John N.; Kozlovsky, Ben-Zion; Salpeter, E. E.
- The Astrophysical Journal, Vol. 171
A serendipitous XMM survey of the SDSS: the evolution of the colour-magnitude diagram of X-ray AGN from z= 0.8 to 0.1: The XMM/SDSS survey
journal, May 2011
- Georgakakis, Antonis; Nandra, K.
- Monthly Notices of the Royal Astronomical Society, Vol. 414, Issue 2
The intermediate line region of QSOs
journal, July 1994
- Brotherton, M. S.; Wills, Beverley J.; Francis, Paul J.
- The Astrophysical Journal, Vol. 430
The Profiles of H beta and [O iii] lambda 5007 in Radio-loud Quasars
journal, January 1996
- Brotherton, M. S.
- The Astrophysical Journal Supplement Series, Vol. 102
Kinematic evidence for a relativistic Keplerian disk - ARP 102B
journal, April 1989
- Chen, Kaiyou; Halpern, Jules P.; Filippenko, Alexei V.
- The Astrophysical Journal, Vol. 339
Measuring the black hole masses of high-redshift quasars
journal, November 2002
- McLure, R. J.; Jarvis, M. J.
- Monthly Notices of the Royal Astronomical Society, Vol. 337, Issue 1
Can we improve C iv-based single-epoch black hole mass estimations?
journal, May 2018
- Mejía-Restrepo, J. E.; Trakhtenbrot, B.; Lira, P.
- Monthly Notices of the Royal Astronomical Society, Vol. 478, Issue 2
Orientation dependency of broad-line widths in quasars and consequences for black hole mass estimation
journal, May 2006
- Jarvis, Matt J.; McLure, Ross J.
- Monthly Notices of the Royal Astronomical Society, Vol. 369, Issue 1
Modeling of the Quasar Main Sequence in the Optical Plane
journal, October 2018
- Panda, Swayamtrupta; Czerny, Bożena; Adhikari, Tek P.
- The Astrophysical Journal, Vol. 866, Issue 2
Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars
journal, October 2006
- Richards, Gordon T.; Lacy, Mark; Storrie‐Lombardi, Lisa J.
- The Astrophysical Journal Supplement Series, Vol. 166, Issue 2
Double-Peaked Profiles: Ubiquitous Signatures of Disks in the Broad Emission Lines of Active Galactic Nuclei
journal, January 2017
- Storchi-Bergmann, T.; Schimoia, J. S.; Peterson, B. M.
- The Astrophysical Journal, Vol. 835, Issue 2
The origin of the broad line region in active galactic nuclei
journal, December 2010
- Czerny, B.; Hryniewicz, K.
- Astronomy & Astrophysics, Vol. 525
The Multi-Object, Fiber-Fed Spectrographs for the Sloan Digital sky Survey and the Baryon Oscillation Spectroscopic Survey
journal, July 2013
- Smee, Stephen A.; Gunn, James E.; Uomoto, Alan
- The Astronomical Journal, Vol. 146, Issue 2
The Quasar Main Sequence Explained by the Combination of Eddington Ratio, Metallicity, and Orientation
journal, September 2019
- Panda, Swayamtrupta; Marziani, Paola; Czerny, Bożena
- The Astrophysical Journal, Vol. 882, 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
Luminosity Indicators in the Spectra of Quasi-Stellar Objects
journal, June 1977
- Baldwin, Jack A.
- The Astrophysical Journal, Vol. 214
Quasars in the 4D eigenvector 1 context: a stroll down memory lane
journal, October 2015
- Sulentic, Jack W.; Marziani, Paola
- Frontiers in Astronomy and Space Sciences, Vol. 2
Relative quasar luminosities determined from emission line strengths
journal, June 1978
- Baldwin, Jack A.; Burke, William L.; Gaskell, C. Martin
- Nature, Vol. 273, Issue 5662
An accretion event in the Seyfert galaxy NGC 5548
journal, November 1986
- Peterson, B. M.; Ferland, G. J.
- Nature, Vol. 324, Issue 6095
Extending the Eigenvector 1 space to the optical variability of quasars
journal, April 2009
- Mao, Yu-Feng; Wang, Jing; Wei, Jian-Yan
- Research in Astronomy and Astrophysics, Vol. 9, Issue 5
AGN Broad Line Region Variability in the Context of Eigenvector 1: Case of NGC 5548
journal, January 2018
- Bon, Nataša; Bon, Edi; Marziani, Paola
- Frontiers in Astronomy and Space Sciences, Vol. 5
Small dense broad-line regions in active nuclei
journal, December 1989
- Rees, M. J.; Netzer, Hagai; Ferland, G. J.
- The Astrophysical Journal, Vol. 347
Black hole mass Estimates Based on c iv are Consistent with Those Based on the Balmer Lines
journal, November 2011
- Assef, R. J.; Denney, K. D.; Kochanek, C. S.
- The Astrophysical Journal, Vol. 742, Issue 2
The evolution of active galactic nuclei across cosmic time: what is downsizing?: The evolution of AGNs across cosmic time
journal, December 2011
- Fanidakis, N.; Baugh, C. M.; Benson, A. J.
- Monthly Notices of the Royal Astronomical Society, Vol. 419, Issue 4
Principal Component Analysis of the Spectral Energy Distribution and Emission line Properties of red 2mass Active Galactic Nuclei
journal, February 2009
- Kuraszkiewicz, Joanna; Wilkes, Belinda J.; Schmidt, Gary
- The Astrophysical Journal, Vol. 692, Issue 2
THE LICK AGN MONITORING PROJECT 2011: Fe II REVERBERATION FROM THE OUTER BROAD-LINE REGION
journal, May 2013
- Barth, Aaron J.; Pancoast, Anna; Bennert, Vardha N.
- The Astrophysical Journal, Vol. 769, Issue 2
Broad-line region physical conditions along the quasar eigenvector 1 sequence: Quasar BLR along the E1 sequence
journal, September 2010
- Marziani, P.; Sulentic, J. W.; Negrete, C. A.
- Monthly Notices of the Royal Astronomical Society, Vol. 409, Issue 3
A Main Sequence for Quasars
journal, March 2018
- Marziani, Paola; Dultzin, Deborah; Sulentic, Jack W.
- Frontiers in Astronomy and Space Sciences, Vol. 5
Infrared Fe ii Emission in Narrow‐Line Seyfert 1 Galaxies
journal, January 2002
- Rodriguez‐Ardila, A.; Viegas, S. M.; Pastoriza, M. G.
- The Astrophysical Journal, Vol. 565, Issue 1
Predicted Fe ii Emission‐Line Strengths from Active Galactic Nuclei
journal, March 2003
- Sigut, T. A. A.; Pradhan, Anil K.
- The Astrophysical Journal Supplement Series, Vol. 145, Issue 1
Kinematic Linkage between the Broad- and Narrow-Line–emitting Gas in Active Galactic Nuclei
journal, September 2002
- Zamanov, R.; Marziani, P.; Sulentic, J. W.
- The Astrophysical Journal, Vol. 576, Issue 1
Doubled-peaked emission lines in active galactic nuclei
journal, January 1994
- Eracleous, Michael; Halpern, Jules P.
- The Astrophysical Journal Supplement Series, Vol. 90
QSO Broad Emission Line Asymmetries: Evidence of Gravitational Redshift?
journal, July 1995
- Corbin, Michael R.
- The Astrophysical Journal, Vol. 447
A Complete Sample of Soft X-Ray-selected AGNs. II. Statistical Analysis
journal, April 2004
- Grupe, Dirk
- The Astronomical Journal, Vol. 127, Issue 4
Completion of a Survey and Detailed Study of Double‐peaked Emission Lines in Radio‐loud Active Galactic Nuclei
journal, December 2003
- Eracleous, Michael; Halpern, Jules P.
- The Astrophysical Journal, Vol. 599, Issue 2
Determination of confidence limits for experiments with low numbers of counts
journal, June 1991
- Kraft, Ralph P.; Burrows, David N.; Nousek, John A.
- The Astrophysical Journal, Vol. 374
Revisiting the Unified Model of Active Galactic Nuclei
journal, August 2015
- Netzer, Hagai
- Annual Review of Astronomy and Astrophysics, Vol. 53, Issue 1
Cosmic Evolution of Mass Accretion Rate and Metallicity in Active Galactic Nuclei
journal, January 2007
- Netzer, Hagai; Trakhtenbrot, Benny
- The Astrophysical Journal, Vol. 654, Issue 2
The Physical Driver of the Optical Eigenvector 1 in Quasar Main Sequence
journal, November 2017
- Panda, Swayamtrupta; Czerny, Bożena; Wildy, Conor
- Frontiers in Astronomy and Space Sciences, Vol. 4
SDSS-IV/SPIDERS: A catalogue of X-ray selected AGN properties: Spectral properties and black hole mass estimates for SPIDERS SDSS DR14 type 1 AGN
journal, May 2019
- Coffey, D.; Salvato, M.; Merloni, A.
- Astronomy & Astrophysics, Vol. 625
The Origin of Fe ii Emission in Active Galactic Nuclei
journal, November 2004
- Baldwin, J. A.; Ferland, G. J.; Korista, K. T.
- The Astrophysical Journal, Vol. 615, Issue 2
Obscured Active Galactic Nuclei
journal, September 2018
- Hickox, Ryan C.; Alexander, David M.
- Annual Review of Astronomy and Astrophysics, Vol. 56, Issue 1
Dust inflated accretion disc as the origin of the broad line region in active galactic nuclei
journal, November 2017
- Baskin, Alexei; Laor, Ari
- Monthly Notices of the Royal Astronomical Society, Vol. 474, Issue 2
A Census of Ionized Gas Outflows in Type 1 AGNs: Gas Outflows in AGNs. V.
journal, September 2018
- Rakshit, Suvendu; Woo, Jong-Hak
- The Astrophysical Journal, Vol. 865, Issue 1
The first XMM-Newton slew survey catalogue: XMMSL1
journal, January 2008
- Saxton, R. D.; Read, A. M.; Esquej, P.
- Astronomy & Astrophysics, Vol. 480, Issue 2
SPIDERS: selection of spectroscopic targets using AGN candidates detected in all-sky X-ray surveys
journal, April 2017
- Dwelly, T.; Salvato, M.; Merloni, A.
- Monthly Notices of the Royal Astronomical Society, Vol. 469, Issue 1
Searching for the Physical Drivers of the Eigenvector 1 Correlation Space
journal, September 2001
- Marziani, P.; Sulentic, J. W.; Zwitter, T.
- The Astrophysical Journal, Vol. 558, Issue 2
Reverberation mapping of active galactic nuclei
journal, March 1993
- Peterson, Bradley M.
- Publications of the Astronomical Society of the Pacific, Vol. 105
The diversity of quasars unified by accretion and orientation
journal, September 2014
- Shen, Yue; Ho, Luis C.
- Nature, Vol. 513, Issue 7517
Partial Correlation and Conditional Correlation as Measures of Conditional Independence
journal, December 2004
- Baba, Kunihiro; Shibata, Ritei; Sibuya, Masaaki
-
Australian
New Zealand Journal of Statistics, Vol. 46, Issue 4
The lick agn Monitoring Project: Broad-Line Region Radii and Black hole Masses from Reverberation Mapping of hβ
journal, October 2009
- Bentz, Misty C.; Walsh, Jonelle L.; Barth, Aaron J.
- The Astrophysical Journal, Vol. 705, Issue 1
ERQs are the BOSS of quasar samples: the highest velocity [O iii] quasar outflows
journal, July 2019
- Perrotta, S.; Hamann, F.; Zakamska, N. L.
- Monthly Notices of the Royal Astronomical Society, Vol. 488, Issue 3
Orientation and quasar black hole mass estimation
journal, October 2015
- Brotherton, Michael S.; Singh, Vikram; Runnoe, Jessie
- Monthly Notices of the Royal Astronomical Society, Vol. 454, Issue 4
The Case for Two Quasar Populations
journal, January 2011
- Sulentic, Jack; Marziani, Paola; Zamfir, Sebastian
- Open Astronomy, Vol. 20, Issue 3
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
The 2.5 m Telescope of the Sloan Digital Sky Survey
journal, April 2006
- Gunn, James E.; Siegmund, Walter A.; Mannery, Edward J.
- The Astronomical Journal, Vol. 131, Issue 4
The Optical and Ultraviolet Emission-Line Properties of Bright Quasars with Detailed Spectral Energy Distributions
journal, August 2012
- Tang, Baitian; Shang, Zhaohui; Gu, Qiusheng
- The Astrophysical Journal Supplement Series, Vol. 201, Issue 2
Radio loudness along the quasar main sequence
journal, September 2019
- Ganci, V.; Marziani, P.; D’Onofrio, M.
- Astronomy & Astrophysics, Vol. 630
Ionized gas in active galactic nuclei
journal, August 2008
- Netzer, Hagai
- New Astronomy Reviews, Vol. 52, Issue 6
The Fundamental Plane of the Broad-Line Region in Active Galactic Nuclei
journal, February 2016
- Du, Pu; Wang, Jian-Min; Hu, Chen
- The Astrophysical Journal, Vol. 818, Issue 1
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
Mode testing, critical bandwidth and excess mass
journal, August 2018
- Ameijeiras-Alonso, Jose; Crujeiras, Rosa M.; Rodríguez-Casal, Alberto
- TEST, Vol. 28, Issue 3
C iv λ1549 as an Eigenvector 1 Parameter for Active Galactic Nuclei
journal, September 2007
- Sulentic, Jack W.; Bachev, Rumen; Marziani, Paola
- The Astrophysical Journal, Vol. 666, Issue 2
AEGIS-X: THE CHANDRA DEEP SURVEY OF THE EXTENDED GROTH STRIP
journal, December 2008
- Laird, E. S.; Nandra, K.; Georgakakis, A.
- The Astrophysical Journal Supplement Series, Vol. 180, Issue 1
Second ROSAT all-sky survey (2RXS) source catalogue
journal, March 2016
- Boller, Th.; Freyberg, M. J.; Trümper, J.
- Astronomy & Astrophysics, Vol. 588
Eddington Accretion and QSO Emission Lines at z ~2
journal, July 2003
- Yuan, Michael Juntao; Wills, Beverley J.
- The Astrophysical Journal, Vol. 593, Issue 1
Average Quasar Spectra in the Context of Eigenvector 1
journal, February 2002
- Sulentic, J. W.; Marziani, P.; Zamanov, R.
- The Astrophysical Journal, Vol. 566, 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
Partial dust obscuration in active galactic nuclei as a cause of broad-line profile and lag variability, and apparent accretion disc inhomogeneities
journal, April 2018
- Gaskell, C. Martin; Harrington, P. Z.
- Monthly Notices of the Royal Astronomical Society, Vol. 478, Issue 2
THE Fe II EMISSION IN ACTIVE GALACTIC NUCLEI: EXCITATION MECHANISMS AND LOCATION OF THE EMITTING REGION
journal, March 2016
- Marinello, M.; Rodríguez-Ardila, A.; Garcia-Rissmann, A.
- The Astrophysical Journal, Vol. 820, Issue 2
What broad emission lines tell us about how active galactic nuclei work
journal, July 2009
- Gaskell, C. Martin
- New Astronomy Reviews, Vol. 53, Issue 7-10
Active galactic nuclei: what’s in a name?
journal, August 2017
- Padovani, P.; Alexander, D. M.; Assef, R. J.
- The Astronomy and Astrophysics Review, Vol. 25, Issue 1
Eigenvector 1: An Optimal Correlation Space for Active Galactic Nuclei
journal, June 2000
- Sulentic, J. W.; Zwitter, T.; Marziani, P.
- The Astrophysical Journal, Vol. 536, Issue 1
Relativistic beaming and quasar emission lines
journal, March 1986
- Wills, B. J.; Browne, I. W. A.
- The Astrophysical Journal, Vol. 302
Testing for multimodality
journal, December 1994
- Fischer, N. I.; Mammen, E.; Marron, J. S.
- Computational Statistics & Data Analysis, Vol. 18, Issue 5
Black hole growth to z = 2 - I. Improved virial methods for measuring MBH and L/LEdd
journal, December 2012
- Trakhtenbrot, B.; Netzer, H.
- Monthly Notices of the Royal Astronomical Society, Vol. 427, Issue 4
Highly accreting quasars: The SDSS low-redshift catalog
journal, December 2018
- Negrete, C. A.; Dultzin, D.; Marziani, P.
- Astronomy & Astrophysics, Vol. 620
Unified Models for Active Galactic Nuclei and Quasars
journal, September 1993
- Antonucci, Robert
- Annual Review of Astronomy and Astrophysics, Vol. 31, Issue 1
Broad emission features in QSOs and active galactic nuclei. II - New observations and theory of Fe II and H I emission
journal, January 1985
- Wills, B. J.; Netzer, H.; Wills, D.
- The Astrophysical Journal, Vol. 288
Principal component analysis: a review and recent developments
journal, April 2016
- Jolliffe, Ian T.; Cadima, Jorge
- Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 374, Issue 2065
A Long-Term Study of Broad Emission Line Profile Variability in NGC 5548
journal, July 1996
- Wanders, Ignaz; Peterson, Bradley M.
- The Astrophysical Journal, Vol. 466
Low-Ionization Outflows in high Eddington Ratio Quasars
journal, February 2013
- Marziani, Paola; Sulentic, Jack W.; Plauchu-Frayn, Ilse
- The Astrophysical Journal, Vol. 764, Issue 2
Broad Emission-Line Shifts in Quasars: An Orientation Measure for Radio-Quiet Quasars?
journal, July 2002
- Richards, Gordon T.; Vanden Berk, Daniel E.; Reichard, Timothy A.
- The Astronomical Journal, Vol. 124, Issue 1
Locally Optimally Emitting Clouds and the Origin of Quasar Emission Lines
journal, December 1995
- Baldwin, Jack; Ferland, Gary; Korista, Kirk
- The Astrophysical Journal, Vol. 455, Issue 2
Discovery of extreme [O iii] λ5007 Å outflows in high-redshift red quasars
journal, March 2016
- Zakamska, Nadia L.; Hamann, Fred; Pâris, Isabelle
- Monthly Notices of the Royal Astronomical Society, Vol. 459, Issue 3
Structure of line-emitting accretion disks in active galactic nuclei - ARP 102B
journal, September 1989
- Chen, Kaiyou; Halpern, Jules P.
- The Astrophysical Journal, Vol. 344
Emission-line profiles and kinematics of the narrow-line region in Seyfert and radio galaxies
journal, July 1981
- Heckman, T. M.; Butcher, H. R.; Miley, G. K.
- The Astrophysical Journal, Vol. 247
Study of Outflows in Luminous Quasars at Redshift ∼0.4–0.8
journal, January 2018
- Wang, J.; Xu, D. W.; Wei, J. Y.
- The Astrophysical Journal, Vol. 852, Issue 1
Reverberation mapping of the emission line regions of Seyfert galaxies and quasars
journal, April 1982
- Blandford, R. D.; McKee, C. F.
- The Astrophysical Journal, Vol. 255
Searching for the physical drivers of eigenvector 1: influence of black hole mass and Eddington ratio
journal, November 2003
- Marziani, P.; Zamanov, R. K.; Sulentic, J. W.
- Monthly Notices of the Royal Astronomical Society, Vol. 345, Issue 4
What does CIV λ 1549 tell us about the physical driver of the Eigenvector quasar sequence?
journal, December 2017
- Sulentic, J. W.; del Olmo, A.; Marziani, P.
- Astronomy & Astrophysics, Vol. 608
Is MgII λ 2800 a reliable virial broadening estimator for quasars?
journal, July 2013
- Marziani, P.; Sulentic, J. W.; Plauchu-Frayn, I.
- Astronomy & Astrophysics, Vol. 555
An Optical Spectroscopic Atlas of Low‐Redshift Active Galactic Nuclei
journal, April 2003
- Marziani, P.; Sulentic, J. W.; Zamanov, R.
- The Astrophysical Journal Supplement Series, Vol. 145, Issue 2
The AGN Black Hole Mass Database
journal, January 2015
- Bentz, Misty C.; Katz, Sarah
- Publications of the Astronomical Society of the Pacific, Vol. 127, Issue 947
VLT/ISAAC spectra of the H β region in intermediate-redshift
quasars : III. H
journal, January 2009
- Marziani, P.; Sulentic, J. W.; Stirpe, G. M.
- Astronomy & Astrophysics, Vol. 495, Issue 1
Determining Central Black Hole Masses in Distant Active Galaxies
journal, June 2002
- Vestergaard, M.
- The Astrophysical Journal, Vol. 571, Issue 2
Phenomenology of Broad Emission Lines in Active Galactic Nuclei
journal, September 2000
- Sulentic, J. W.; Marziani, P.; Dultzin-Hacyan, D.
- Annual Review of Astronomy and Astrophysics, Vol. 38, Issue 1
The emission-line properties of low-redshift quasi-stellar objects
journal, May 1992
- Boroson, Todd A.; Green, Richard F.
- The Astrophysical Journal Supplement Series, Vol. 80
The Fe II problem in NLS1s
journal, September 2000
- Collin, Suzy; Joly, Monique
- New Astronomy Reviews, Vol. 44, Issue 7-9
Detailed characterization of Hβ emission line profile in low- z SDSS quasars
journal, April 2010
- Zamfir, S.; Sulentic, J. W.; Marziani, P.
- Monthly Notices of the Royal Astronomical Society, Vol. 403, Issue 4
L[CLC]y[/CLC]α Fluorescent Excitation of F[CLC]e[/CLC] [CSC]ii[/CSC] in Active Galactic Nuclei
journal, June 1998
- Sigut, T. A. A.; Pradhan, Anil K.
- The Astrophysical Journal, Vol. 499, Issue 2
The Intermediate-Line Region in Active Galactic Nuclei
journal, October 2016
- Adhikari, T. P.; Różańska, A.; Czerny, B.
- The Astrophysical Journal, Vol. 831, Issue 1
Some Aspects of Measurement Error in Linear Regression of Astronomical Data
journal, August 2007
- Kelly, Brandon C.
- The Astrophysical Journal, Vol. 665, Issue 2
Continuum and Emission‐Line Strength Relations for a Large Active Galactic Nuclei Sample
journal, December 2002
- Dietrich, M.; Hamann, F.; Shields, J. C.
- The Astrophysical Journal, Vol. 581, Issue 2
THE SLOAN DIGITAL SKY SURVEY REVERBERATION MAPPING PROJECT: NO EVIDENCE FOR EVOLUTION IN THE ${{M}_{\bullet }}-{{\sigma }_{*}}$ RELATION TO $z\sim 1$
journal, May 2015
- Shen, Yue; Greene, Jenny E.; Ho, Luis C.
- The Astrophysical Journal, Vol. 805, Issue 2
The Baldwin Effect and Black Hole Accretion: A Spectral Principal Component Analysis of a Complete Quasar Sample
journal, March 2003
- Shang, Zhaohui; Wills, Beverley J.; Robinson, Edward L.
- The Astrophysical Journal, Vol. 586, Issue 1
AGN Host Galaxies at z ~ 0.4-1.3: Bulge-dominated and Lacking Merger-AGN Connection
journal, June 2005
- Grogin, N. A.; Conselice, C. J.; Chatzichristou, E.
- The Astrophysical Journal, Vol. 627, Issue 2
Long-Term Profile Variability in Active Galactic Nucleus with Double-Peaked Balmer Emission Lines
journal, March 2010
- Lewis, Karen T.; Eracleous, Michael; Storchi-Bergmann, Thaisa
- The Astrophysical Journal Supplement Series, Vol. 187, Issue 2
Finding counterparts for all-sky X-ray surveys with Nway: a Bayesian algorithm for cross-matching multiple catalogues
journal, October 2017
- Salvato, M.; Buchner, J.; Budavári, T.
- Monthly Notices of the Royal Astronomical Society, Vol. 473, Issue 4
Dissecting the Quasar main Sequence: Insight from host Galaxy Properties
journal, April 2015
- Sun, Jiayi; Shen, Yue
- The Astrophysical Journal, Vol. 804, Issue 1
Balmer lines emission region in NGC 3516: Kinematical and physical
properties
journal, July 2002
- Popović, L. Č.; Mediavilla, E. G.; Kubičela, A.
- Astronomy & Astrophysics, Vol. 390, Issue 2
Failed Radiatively Accelerated Dusty Outflow Model of the Broad Line Region in Active Galactic Nuclei. I. Analytical Solution
journal, September 2017
- Czerny, B.; Li, Yan-Rong; Hryniewicz, K.
- The Astrophysical Journal, Vol. 846, Issue 2