J/ApJ/805/96 SDSS-RM project: velocity dispersions of QSOs (Shen+, 2015)
The Sloan Digital Sky Survey reverberation mapping project: no evidence
for evolution in the M•-σ* relation to z∼1.
Shen Y., Greene J.E., Ho L.C., Brandt W.N., Denney K.D., Horne K.,
Jiang L., Kochanek C.S., McGreer I.D., Merloni A., Peterson B.M.,
Petitjean P., Schneider D.P., Schulze A., Strauss M.A., Tao C., Trump J.R.,
Pan K., Bizyaev D.
<Astrophys. J., 805, 96 (2015)>
=2015ApJ...805...96S 2015ApJ...805...96S
ADC_Keywords: Velocity dispersion ; QSOs ; Redshifts ; Spectroscopy
Keywords: black hole physics; galaxies: active; quasars: general
Abstract:
We present host stellar velocity dispersion measurements for a sample
of 88 broad-line quasars at 0.1<z<1 (46 at z>0.6) from the Sloan
Digital Sky Survey Reverberation Mapping (SDSS-RM) project. High
signal-to-noise ratio coadded spectra (average S/N∼30 per 69km/s
pixel) from SDSS-RM allowed for the decomposition of the host and
quasar spectra and for measurements of the host stellar velocity
dispersions and black hole (BH) masses using the single-epoch (SE)
virial method. The large sample size and dynamic range in luminosity
(L5100=1043.2-44.7erg/s) lead to the first clear detection of a
correlation between SE virial BH mass and host stellar velocity
dispersion far beyond the local universe. However, the observed
correlation is significantly flatter than the local relation,
suggesting that there are selection biases in high-z
luminosity-threshold quasar samples for such studies. Our uniform
sample and analysis enable an investigation of the redshift evolution
of the M{dot}-σ* relation relatively free of caveats by
comparing different samples/analyses at disjoint redshifts. We do not
observe evolution of the M{dot}-σ* relation in our sample up
to z∼1, but there is an indication that the relation flattens toward
higher redshifts. Coupled with the increasing threshold luminosity
with redshift in our sample, this again suggests that certain
selection biases are at work, and simple simulations demonstrate that
a constant M{dot}-σ* relation is favored to z∼1. Our results
highlight the scientific potential of deep coadded spectroscopy from
quasar monitoring programs, and offer a new path to probe the
co-evolution of BHs and galaxies at earlier times.
Description:
The spectra were taken as part of the SDSS-III BOSS survey (Eisenstein
et al. 2011AJ....142...72E 2011AJ....142...72E; Dawson et al. 2013AJ....145...10D 2013AJ....145...10D) from
2014 January to July.
The wavelength coverage of BOSS spectroscopy is 3650-10400Å, with a
spectral resolution of R∼2000.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 153 212 Catalog in ASCII format; without vectors (wave,
fluxes and errors) provided as graphics
table1.fits 2880 13704 Full catalog in FITS format
--------------------------------------------------------------------------------
See also:
J/ApJS/216/4 : SDSS-RM project: technical overview (Shen+, 2015)
J/ApJ/746/169 : Luminosity function of broad-line quasars (Shen+, 2012)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/ApJ/708/137 : Broad-line AGNs in zCOSMOS survey (Merloni+, 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/641/L21 : Black hole mass & velocity dispersion relation (Greene+, 2006)
J/AJ/131/84 : AGNs and host galaxies information (Vanden Berk+, 2006)
J/ApJS/152/251 : Indo-US library of coude feed stellar spectra (Valdes+, 2004)
http://www.sdss3.org/ : SDSS-III home page
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- RMID [5/848] Sequential number in the SDSS-RM
master catalog
5- 22 A18 --- SDSS SDSS designation (HHMMSS.ss+DDMMSS.s; J2000)
24- 33 F10.6 deg RAdeg Right ascension in decimal degrees (J2000)
35- 43 F9.6 deg DEdeg Declination in decimal degrees (J2000)
45- 50 F6.4 --- z [0.1/1.1] Redshift
52- 57 F6.2 --- SNt [6.9/230.3] Median S/N per pixel for the
full spectrum (MEDSN_TOT)
59- 63 F5.2 --- SNg [0/79.1] Median S/N per pixel for decomposed
galaxy spectrum over restframe 4125-5350Å
65- 68 F4.2 --- fH420 [0/0.9] Host fraction within restframe
4160-4210Å; 0 if decomposition failed
70- 73 F4.2 --- fH510 [0/0.9] Host fraction at restframe 5100Å
75- 79 F5.1 km/s sigma [43/380]? Fiducial stellar velocity dispersion
81- 84 F4.1 km/s e_sigma [1.9/75]? Measurement error in sigma
86 I1 --- f_sigma [0/1] 1: if e_sigma may underestimate the
systematic uncertainty
88- 93 F6.1 km/s sigHK [6.9/1000]? Stellar velocity dispersion
based on Ca H+K
95- 99 F5.1 km/s e_sigHK [4.6/332]? Measurement error in sigmaHK
101-107 F7.4 [10-7W] L510 [42.4/45.5]? Total continuum luminosity at
restframe 5100Å (in erg/s)
109-114 F6.4 [10-7W] e_L510 [0.0004/0.06]? Measurement error in L510
116-122 F7.4 [10-7W] L510Q [41.8/45.5]? Quasar continuum log luminosity
at restframe 5100Å (erg/s)
124-129 F6.4 [10-7W] e_L510Q [0.0004/0.06]? Measurement error in L5100Q
131-135 I5 km/s FWHMHb [1425/14337] FWHM of broad Hβ
137-141 I5 km/s e_FWHMHb [10/12970] Measurement error in FWHMHb
143-147 F5.3 [Msun] logMbh [6.9/9.5]? Single epoch virial mass estimate
based on the Vestergaard et al.
(2006ApJ...641..689V 2006ApJ...641..689V) Hβ recipe
149-153 F5.3 [Msun] e_logMbh [0.004/3.9]? Measurement error in logMbh
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 11-Sep-2015