J/ApJ/812/66 NIR spectra of 5 red quasars at 0.5<z<0.9 (Kim+, 2015)
Accretion rates of red quasars from the hydrogen Pβ line.
Kim D., Im M., Glikman E., Woo J.-H., Urrutia T.
<Astrophys. J., 812, 66 (2015)>
=2015ApJ...812...66K 2015ApJ...812...66K (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Spectra, infrared ; Redshifts
Keywords: galaxies: active; galaxies: evolution; infrared: galaxies;
quasars: emission lines; quasars: supermassive black holes
Abstract:
Red quasars are thought to be an intermediate population between
merger-driven star-forming galaxies in dust-enshrouded phase and
normal quasars. If so, they are expected to have high accretion
ratios, but their intrinsic dust extinction hampers reliable
determination of Eddington ratios. Here, we compare the accretion
rates of 16 red quasars at z∼0.7 to those of normal type 1 quasars at
the same redshift range. The red quasars are selected by their red
colors in optical through near-infrared (NIR) and radio detection. The
accretion rates of the red quasars are derived from the Pβ line
in NIR spectra, which is obtained by the SpeX on the Infrared
Telescope Facility in order to avoid the effects of dust extinction.
We find that the measured Eddington ratios (Lbol/LEdd~=0.69) of
red quasars are significantly higher than those of normal type 1
quasars, which is consistent with a scenario in which red quasars are
the intermediate population and the black holes of red quasars grow
very rapidly during such a stage.
Description:
NIR spectra of 20 red quasars were obtained using the SpeX instrument
on the NASA Infrared Telescope Facility (IRTF). Descriptions of the
observations of 11 of the 20 red quasars are given in Glikman et al.
(2007, J/ApJ/667/673 and 2012, J/ApJ/757/51). Additionally, we
obtained IRTF NIR spectra for the remaining nine sources. We detect
Pβ emission line for five red quasars (0911+0143, 1248+0531,
1309+6042, 1313+1453, and 1434+0935) with a signal-to-noise ratio
(S/N) of >5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 38 16 List of 16 red quasars at z∼0.7
table3.dat 36 15032 Five red quasar spectra
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See also:
VII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
VII/248 : Quasars and Active Galactic Nuclei (12th Ed.) (Veron+ 2006)
VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)
J/ApJS/217/5 : HAQ survey: red QSO candidates follow-up (Krogager+, 2015)
J/ApJ/806/109 : Rest-frame optical spectra of 3<z<6 QSOs (Jun+, 2015)
J/ApJ/804/34 : Luminous AGNs and early-type SDSS galaxies (Hong+, 2015)
J/ApJS/216/17 : AKARI 2.5-5um spectra of nearby Type-1 AGNs (Kim+, 2015)
J/ApJ/778/127 : UKIDSS+FIRST+SDSS red QSOs candidates (Glikman+, 2013)
J/ApJS/208/24 : Spitzer MIR AGN survey. I. (Lacy+, 2013)
J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013)
J/ApJ/757/51 : FIRST-2MASS dust-reddened QSO spectra (Glikman+, 2012)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/ApJ/716/348 : The XMM-Newton survey of the COSMOS field (Brusa+, 2010)
J/ApJS/183/17 : The SDSS DR5/XMM-Newton quasar survey (Young+, 2009)
J/ApJ/698/1095 : The FIRST-2MASS red QSO survey. II. (Urrutia+, 2009)
J/ApJS/175/116 : SNU bright quasar survey (SNUQSO) (Lee+, 2008)
J/ApJ/667/673 : FIRST-2MASS red quasar survey (Glikman+, 2007)
J/AJ/133/186 : Optical spectroscopy of 77 luminous AGNs & QSOs (Lacy+, 2007)
J/ApJ/640/579 : Near-infrared spectra of 27 SDSS quasars (Glikman+, 2006)
J/AJ/126/2209 : X-ray AGN from RASS and SDSS (Anderson+, 2003)
J/ApJS/135/227 : The FIRST bright quasar survey. III. (Becker+, 2001)
J/AJ/119/2540 : Asiago-ESO/RASS QSO survey. I. (Grazian+, 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- F2MS Quasar identifier (HHMM+DDMM; J2000)
11- 15 F5.3 --- z [0.5/0.9] Redshift
17- 20 F4.2 mag E(B-V) [0.2/1.5] B-V color excess
22- 26 F5.2 mag Kmag [13.6/15.3] K-band magnitude
28- 31 F4.2 mag r'-K [4.1/7] r'-K color index
33 A1 --- f_r'-K a: R-K mags from Glikman et al. (2007,
J/ApJ/667/673)
35- 38 F4.2 mag J-K [1.5/3.5] J-K color index
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- F2MS Quasar identifier (HHMM+DDMM; J2000)
11- 15 I5 0.1nm lambda [9381/24243] Wavelength in Angstroms
17- 26 E10.3 cW/m2/nm Flambda ? Flux in ergs/s/cm2/Angstrom
28- 36 E9.3 cW/m2/nm e_Flambda ? Error in Flux
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Feb-2016