J/ApJ/764/45 Luminosity function of broad-line quasars. II. (Kelly+, 2013)
The demographics of broad-line quasars in the mass-luminosity plane.
II. Black hole mass and Eddington ratio functions.
Kelly B.C., Shen Y.
<Astrophys. J., 764, 45 (2013)>
=2013ApJ...764...45K 2013ApJ...764...45K
ADC_Keywords: Active gal. nuclei ; QSOs ; Models
Keywords: black hole physics; galaxies: active; quasars: general; surveys
Abstract:
We employ a flexible Bayesian technique to estimate the black hole
(BH) mass and Eddington ratio functions for Type 1 (i.e., broad line)
quasars from a uniformly selected data set of ∼58000 quasars from the
Sloan Digital Sky Survey (SDSS) DR7. We find that the SDSS becomes
significantly incomplete at MBH≲3x108M☉ or L/LEdd≲0.07,
and that the number densities of Type 1 quasars continue to increase
down to these limits. Both the mass and Eddington ratio functions show
evidence of downsizing, with the most massive and highest Eddington
ratio BHs experiencing Type 1 quasar phases first, although the
Eddington ratio number densities are flat at z<2. We estimate the
maximum Eddington ratio of Type 1 quasars in the observable universe
to be L/LEdd∼3. Consistent with our results in Shen & Kelly (Paper I,
Cat. J/ApJ/746/169), we do not find statistical evidence for a
so-called sub-Eddington boundary in the mass-luminosity plane of
broad-line quasars, and demonstrate that such an apparent boundary in
the observed distribution can be caused by selection effect and errors
in virial BH mass estimates. Based on the typical Eddington ratio in a
given mass bin, we estimate growth times for the BHs in Type 1 quasars
and find that they are comparable to or longer than the age of the
universe, implying an earlier phase of accelerated (i.e., with higher
Eddington ratios) and possibly obscured growth. The large masses
probed by our sample imply that most of our BHs reside in what are
locally early-type galaxies, and we interpret our results within the
context of models of self-regulated BH growth.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 33 434 Type 1 quasar black hole mass functions
table2.dat 33 364 Type 1 quasar black hole Eddington ratio functions
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See also:
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/A+A/541/A118 : AGN-Host Galaxy Connection (Povic+, 2012)
J/ApJ/761/143 : Black hole masses of z∼1.4 AGNs from SXDS (Nobuta+, 2012)
J/ApJ/753/125 : NIR spectroscopy follow-up of 60 SDSS-DR7 QSOs (Shen+, 2012)
J/ApJ/746/169 : Luminosity function of broad-line quasars. I. (Shen+, 2012)
J/MNRAS/416/1900 : CENSORS + other 1.4GHz sources (Rigby+, 2011)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/ApJS/194/42 : SDSS-DR3 MgII-based black hole masses (Rafiee+, 2011)
J/ApJ/742/68 : HST observations of low-mass BH host galaxies (Jiang+, 2011)
J/ApJ/733/60 : Accretion rate of AGNs from COSMOS surveys (Trump+, 2011)
J/ApJ/720/368 : Color-magnitude relations of galaxies in CDFs (Xue+, 2010)
J/ApJ/708/137 : Broad-line AGNs in zCOSMOS survey (Merloni+, 2010)
J/ApJ/691/705 : AGN host galaxy morphologies in COSMOS (Gabor+, 2009)
J/ApJ/699/800 : Mass functions of active black holes (Vestergaard+, 2009)
J/ApJ/690/20 : Models of the AGN and black hole populations (Shankar+, 2009)
J/ApJ/680/169 : SDSS DR5 virial black hole masses (Shen+, 2008)
J/A+A/492/637 : Eddington ratios of faint AGN (Gavignaud+, 2008)
J/ApJS/176/355 : AGN X-Ray emission and black holes (Kelly+, 2008)
J/ApJS/172/383 : AGN candidates in the COSMOS field (Trump+, 2007)
J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)
J/ApJS/168/1 : Black hole mass estimates (Kelly+, 2007)
J/ApJ/667/131 : Mass function of active black holes (Greene+, 2007)
J/ApJ/654/115 : DEEP2 Galaxy Redshift Survey: SDSS QSOs (Coil+, 2007)
J/AJ/133/2222 : Clustering of high-redshift QSOs from SDSS (Shen+, 2007)
J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)
J/ApJ/614/91 : Black hole mass and accretion rate of AGNs (Wu+, 2004)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 F5.3 --- zbar [0.4/4.75] Mean redshift (1)
7- 12 F6.3 [Msun] logMBH [8/11] Log black hole mass
14- 19 F6.2 [Mpc-3] b_logPhi Lower boundary on logPhi (2)
21- 26 F6.2 [Mpc-3] logPhi [-13/-3] Posterior log median for BH mass
function
28- 33 F6.2 [Mpc-3] B_logPhi Upper boundary on logPhi (2)
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Note (1): Tabulated here are the results for the β = 0 error model.
Results for the β!=0 error model are similar to those
presented in Paper I (J/ApJ/746/169)
Note (2): Lower|Upper boundary on the region containing 68% of the posterior
probability for the BHMF, i.e., the 16th|84th percentile of the
posterior distribution.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 F5.3 --- z [0.4/4.75] Mean redshift
7- 12 F6.3 [-] logL [-1.5/1] Log luminosity relative to Eddington
14- 19 F6.2 [Mpc-3] b_logPhi Lower boundary on logPhi (1)
21- 26 F6.2 [Mpc-3] logPhi [-13/-3] Posterior log median for BH
Eddington ratio function
28- 33 F6.2 [Mpc-3] B_logPhi Upper boundary on logPhi (1)
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Note (1): Lower|Upper boundary on the region containing 68% of the posterior
probability for the BHERF, i.e., the 16th|84th percentile of the
posterior distribution.
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History:
From electronic version of the journal
References:
Shen & Kelly. Paper I. 2012ApJ...746..169S 2012ApJ...746..169S Cat. J/ApJ/746/169
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 24-Oct-2014