J/ApJ/804/L15 SDSS-DR7 broad-line QSOs (Sun+, 2015)
Dissecting the quasar main sequence: insight from host galaxy properties.
Sun J., Shen Y.
<Astrophys. J., 804, L15 (2015)>
=2015ApJ...804L..15S 2015ApJ...804L..15S
ADC_Keywords: QSOs ; Velocity dispersion ; Equivalent widths ; Redshifts
Keywords: black hole physics; galaxies: active; line: profiles;
quasars: general; surveys
Abstract:
The diverse properties of broad-line quasars appear to follow a
well-defined main sequence along which the optical FeII strength
increases. It has been suggested that this sequence is mainly driven
by the Eddington ratio (L/LEdd) of the black hole (BH) accretion.
Shen & Ho (2014Natur.513..210S 2014Natur.513..210S) demonstrated with quasar clustering
analysis that the average BH mass decreases with increasing FeII
strength when quasar luminosity is fixed, consistent with this
suggestion. Here we perform an independent test by measuring the
stellar velocity dispersion σ* (hence, the BH mass via the
M-σ* relation) from decomposed host spectra in low-redshift
Sloan Digital Sky Survey quasars. We found that at fixed quasar
luminosity, σ* systematically decreases with increasing FeII
strength, confirming that the Eddington ratio increases with FeII
strength. We also found that at fixed luminosity and FeII strength,
there is little dependence of σ* on the broad Hβ FWHM.
These new results reinforce the framework that the Eddington ratio and
orientation govern most of the diversity seen in broad-line quasar
properties.
Description:
Our quasar sample consists of all objects spectroscopically classified
as broad-line quasars (CLASS="QSO") from SDSS DR7 (Abazajian et al.
2009, II/294), with a redshift cut of 0.01<z<0.8.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
data.dat 173 7922 Spectra measurement results of the quasar sample
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See also:
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/ApJ/758/1 : SDSS-Spitzer AGN properties (LaMassa+, 2012)
J/ApJ/737/71 : The [OIII] emission line in SDSS AGNs (Zhang+, 2011)
J/ApJ/736/86 : FeII emission in SDSS type 1 AGNs (Dong+, 2011)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/ApJS/189/15 : FeII emission in a sample of AGN spectra (Kovacevic+, 2010)
J/ApJ/680/169 : SDSS DR5 virial black hole masses (Shen+, 2008)
J/AJ/135/928 : The black hole-bulge relationship (Shen+, 2008)
J/ApJ/666/757 : CIV 1549Å emission line in AGNs (Sulentic+, 2007)
J/AJ/131/84 : AGNs and host galaxies information (Vanden Berk+, 2006)
J/ApJ/549/155 : [OIII] emission in a sample of AGNs (Nagao+, 2001
J/A+A/309/81 : X-ray properties of AGN (Wang+, 1996)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: data.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- MJD [51578/54621] Modified Julian Date
7- 10 I4 --- Plate [266/2974] Plate number
12- 14 I3 --- Fiber [1/640] Fiber ID number
16- 25 F10.6 deg RAdeg Right Ascension of the object (J2000)
27- 36 F10.6 deg DEdeg Declination of the object (J2000)
38- 42 F5.3 --- z [0.01/0.8] SDSS-DR7 redshift
44- 48 F5.2 --- SN [1.7/65] Global median S/N of full spectrum
50- 55 F6.3 [10-7W] L5100 [42/46] Log luminosity at 510nm (erg/s)
57- 61 F5.3 [10-7W] e_L5100 [0.002/0.1] Error of logL5100
63- 66 F4.2 --- hf4185 [0.1/0.9] Host fraction at 4185Angstrom
68- 71 F4.2 --- hf5100 [0/1] Host fraction at 5100Angstrom
73- 77 F5.2 --- SNh [0/36.2] Median S/N of host spectrum for
sigma fitting
79- 81 I3 km/s sigma [40/837] Host stellar velocity dispersion
83- 85 I3 km/s e_sigma [4/269] Error of velocity dispersion
87- 89 I3 km/s Csigma [41/923] Velocity dispersion with aperture
effect corrected
91- 93 I3 km/s e_Csigma [4/296] Error of corrected sigma
95- 99 F5.2 --- SNa [0.6/48] Median S/N of AGN spectrum for
line measuring
101-107 F7.4 [10-7W] L5100a [41/46] logL5100 of AGN
109-114 F6.4 [10-7W] e_L5100a [0.0008/0.2] Error of AGN logL5100
116-124 F9.4 0.1nm W(FeII) [0.008/1200]?=0 Equivalent width of broad FeII
126-133 F8.4 0.1nm e_W(FeII) [0.0003/151]?=-1 Error of broad FeII EW
135-141 E7.2 0.1nm W(OIII) [0.1/1.4e+09]?=0 Equivalent width of
[OIII]5007Å
143-150 E8.2 0.1nm e_W(OIII) [0.1/2.1e+09]?=-1 Error of [OIII]5007 EW
152-156 I5 km/s FW(Hb) [1200/41654] FWHM of broad Hβ line
158-164 E7.2 km/s e_FW(Hb) [0.5/20000] Error of broad Hβ FWHM
166-169 I4 0.1nm W(Hb) [5/1050] Equivalent width of broad Hβ
171-173 I3 0.1nm e_W(Hb) [1/315] Error of broad Hβ EW
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History:
From electronic version of the journal (FITS file)
(End) Emmanuelle Perret [CDS] 03-Sep-2015