J/ApJ/928/60 Virial factor of SDSS DR5 QSOs (Liu+, 2022)
Measuring the virial factor in SDSS DR5 quasars with redshifted Hβ and
FeII broad emission lines.
Liu H.T., Feng H.-C., Li S.-S., Bai J.M.
<Astrophys. J., 928, 60 (2022)>
=2022ApJ...928...60L 2022ApJ...928...60L
ADC_Keywords: QSOs; Black holes; Spectra, optical; Redshifts;
Velocity dispersion
Keywords: Black hole physics ; Active galactic nuclei ;
Emission line galaxies ; Quasars ; Supermassive black holes
Abstract:
Under the hypothesis of gravitational redshift induced by a central
supermassive black hole, and based on line widths and shifts of
redward-shifted Hβ and FeII broad emission lines for a sample of
1973 z<0.8 Sloan Digital Sky Survey DR5 quasars, we measured the
virial factor in determining supermassive black hole masses, usually
estimated by the reverberation mapping method or the relevant
secondary methods. The virial factor had been believed to be from the
geometric effect of the broad-line region. The measured virial factor
of FeII is larger than that of Hβ for 98% of these quasars. The
virial factor is very different from object to object and for
different emission lines. For most of these quasars, the virial factor
of Hβ is larger than these averages that were usually used in
determining the masses of black holes. There are three positive
correlations among the measured virial factor of Hβ,
dimensionless accretion rate, and FeII/Hβ line ratio. A positive
three-dimensional correlation is found among these three quantities,
and this correlation indicates that the virial factor is likely
dominated by the dimensionless accretion rate and metallicity. A
negative correlation is found between the redward shift of Hβ and
the scaled size of the broad-line region radius in units of the
gravitational radius of the black hole. This negative correlation will
be expected naturally if the redward shift of Hβ is mainly from
the gravity of the black hole. Radiation pressure from the accretion
disk may be a significant contributor to the virial factor.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 163 1973 The relevant parameters for 1973 quasars in SDSS DR5
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See also:
VII/252 : SDSS-DR5 quasar catalog (Schneider+, 2007)
VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
J/ApJ/613/682 : AGN masses and broad-line region sizes (Peterson+, 2004)
J/ApJ/632/799 : NGC4395 light curves (Peterson+, 2005)
J/ApJ/687/78 : FeII emission in quasars (Hu+, 2008)
J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)
J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335 & IRAS F12397+3333 (Du+, 2014)
J/ApJ/795/38 : Phot./sp. measurements for KA1858+4850 (Pei+, 2014)
J/ApJ/793/108 : SEAMBHs. II. Continuum and Hbeta LCs (Wang+, 2014)
J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)
J/ApJ/806/22 : SEAMBHs IV. Hβ time lags (Du+, 2015)
J/ApJS/216/4 : SDSS-RM project: technical overview (Shen+, 2015)
J/ApJ/805/96 : SDSS-RM project: velocity dispersions of QSOs (Shen+, 2015)
J/ApJ/827/118 : A new reverberation mapping campaign on NGC 5548 (Lu+, 2016)
J/ApJ/818/30 : Lag measurements for z<0.8 QSOs from SDSS-RM (Shen+, 2016)
J/ApJ/851/21 : SDSS RM project first year of observations (Grier+, 2017)
J/ApJ/837/131 : Space telescope RM project. V. NGC5548 (Pei+, 2017)
J/ApJ/869/142 : Monitoring AGNs with Hβ Asymmetry (MAHA) I. (Du+, 2018)
J/ApJ/856/6 : SEAMBHs IX. 10 new Hβ light curves (Du+, 2018)
J/ApJ/886/42 : Reverberation mapping & opt. spectra of AGNs (Du+, 2019)
J/ApJS/243/21 : Broad-line AGN from SDSS-DR7 (Liu+, 2019)
J/ApJS/241/34 : SDSS Reverberation Mapping (SDSS-RM) project (Shen+, 2019)
J/ApJ/876/49 : 10yr reverberation mapping campaign for 3C273 (Zhang+, 2019)
J/ApJ/905/75 : 3yrs spectroscopic light curves of PG0026+129 (Hu+, 2020)
J/MNRAS/491/5881 : Extended size-luminosity relation for RM AGNs (Yu+, 2020)
J/ApJ/909/18 : Reverberation mapping monitoring of NGC3516 (Feng+, 2021)
J/ApJ/912/92 : Lijiang/YFOSC light curves of NGC 2617 (Feng+, 2021)
J/ApJ/918/50 : Reverberation mapping for Mrk 817 and NGC 7469 (Lu+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- SDSS SDSS DR5 object designation
(HHMMSS.ss+DDMMSS.s; J2000)
20- 25 F6.4 --- z [0.078/0.81] Spectroscopic redshift (1)
27- 33 F7.1 km/s VHb [704/11428] Hβ broad line Full-Width
at Half-Maximum (1)
35- 39 F5.1 km/s e_VHb [15/899] Uncertainty in VHb
41- 46 F6.1 km/s sigmaHb [591/5057] Hβ broad line velocity
dispersion (1)
48- 53 F6.1 km/s DelVHb [19/3336] Redward velocity shift of
Hβ (1)
55- 59 F5.1 km/s e_DelVHb [8/432] Uncertainty in DelVHb
61- 66 F6.1 km/s VFe2 [922/9227] FeII broad line Full-Width at
Half-Maximum (1)
68- 73 F6.1 km/s e_VFe2 [18/2657] Uncertainty in VFe2
75- 80 F6.1 km/s DelVFe2 [24/2969] Redward velocity shift of FeII (1)
82- 86 F5.1 km/s e_DelVFe2 [9/656] Uncertainty in DelVFe2
88- 92 F5.2 [10-7W] logL [43.75/46.17] Log luminosity at 5100Å;
erg/s (1)
94- 98 F5.1 10+7Msun MBH [0.9/573] Black hole mass (1)
100- 104 F5.3 --- Lb/LE [0.016/1.21] Ratio of bolometric to
Eddington luminosities (1)
106- 110 F5.3 --- RFe [0.16/4.4] FeII/Hβ line ratio (1)
112- 115 F4.1 --- f(Hb) [0.3/94] Virial factor from VHb
117- 120 F4.1 --- e_f(Hb) [0.2/32] Uncertainty in f (Hb)
122- 126 F5.1 --- f(sigHb) [1/148.1] Virial factor from sigmaHb
128- 131 F4.1 --- e_f(sigHb) [0.5/42] Uncertainty in f (sigmaHb)
133- 137 F5.1 --- f(Fe2) [1/222] Virial factor from VFe2
139- 149 F11.1 --- e_f(Fe2) [0.7/340000000] Uncertainty in f (Fe2)
151- 155 F5.2 [-] logMdot [-0.4/1.5] Log dimensionless accretion rate
157- 163 F7.1 --- Ratio [633/46406] Broad-line region radius (2)
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Note (1): Taken from Table 2 of Hu+ (2008, J/ApJ/687/78).
Note (2): In units of rg, where Ratio=rBLR/rg and rBLR=22.3L0.6944
light-days with L44=L(5100Å)/(1e+44erg/s).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 26-Jan-2024