J/MNRAS/461/2346 Radio-loud and radio-quiet quasars sample (Gupta+, 2016)
Covering factors of the dusty obscurers in radio-loud and radio-quiet quasars.
Gupta M., Sikora M., Nalewajko K.
<Mon. Not. R. Astron. Soc., 461, 2346-2352 (2016)>
=2016MNRAS.461.2346G 2016MNRAS.461.2346G (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Photometry, infrared ; Redshifts ; Radio sources
Keywords: quasars: general - infrared: galaxies
Abstract:
We compare covering factors of circumnuclear dusty obscurers in
radio-loud and radio-quiet quasars. The radio-loud quasars are
represented by a sample of FR II quasars obtained by cross-matching a
catalog of the FR II radio sources selected by van Velzen et al. with
the SDSS DR7 catalog of quasars. Covering factors of FR II quasars are
compared with covering factors of the radio-quiet quasars matched with
them in redshift, black hole mass, and Eddington-ratio. We found that
covering factors, proxied by the infrared-to-bolometric luminosity
ratio, are on average slightly smaller in FR II quasars than in
radio-quiet quasars, however, this difference is statistically
significant only for the highest Eddington ratios. For both samples,
no statistically significant dependence of a median covering factor on
Eddington ratio, black hole mass, nor redshift can be claimed.
Description:
We performed matching of the FR II quasar sample of van Velzen et al.
(2015, Cat. J/MNRAS/446/2985) (1108 sources) with the SDSS DR7 quasar
catalogue (Schneider et al., 2010AJ....139.2360S 2010AJ....139.2360S, Cat. VII/260) (105
783 sources). We used a matching radius of 5 arcsec and obtained 899
objects. This resulting sample of FR II quasars was then matched with
the sample of SDSS DR7 quasars detected by the Wide-field Infrared
Survey Explorer (WISE) (Wu et al., 2012, Cat. J/AJ/144/49). This gave
us 895 FR II quasars detected in the MIR band.
The RQ sample with MIR data is constructed by matching the DR7 quasar
catalogue (Schneider et al., 2010AJ....139.2360S 2010AJ....139.2360S, Cat. VII/260) and
Wise all-sky catalogue (Wu et al., 2012, Cat. J/AJ/144/49), using a
matching radius of 1 arcsec, resulting in 101 853 objects. From these
we remove the 899 RL quasars matched with the catalogue by van Velzen
et al. (2015, Cat. J/MNRAS/446/2985), this leaves us with 100 958
quasars. We then remove objects that were detected by the FIRST survey
(Becker et al. 1995ApJ...450..559B 1995ApJ...450..559B, Cat. VIII/92), this gives us 92
648. We repeat the same process with the NVSS (Condon, Cotton &
Broderick, 1998AJ....115.1693C 1998AJ....115.1693C, Cat. VIII/65) and end up with 92 445
objects. We also removed those objects that were outside the FIRST
observation region.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rlsample.dat 152 797 FR II quasar sample catalogue
rqsample.dat 115 67480 Radio-quiet (RQ) sample catalogue
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See also:
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)
J/AJ/144/49 : Quasars from SDSS-DR7, WISE and UKIDSS surveys (Wu+, 2012)
J/MNRAS/446/2985 : Double-lobed radio sources catalog (van Velzen+, 2015)
Byte-by-byte Description of file: rlsample.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- SDSS SDSS nanme from DR7 (HHMMSS.ss+DDMMSS.s)
20- 28 F9.5 deg RAdeg Right ascension (J2000)
30- 38 F9.5 deg DEdeg Declination (J2000)
40- 45 F6.4 --- z Redshift
47- 51 F5.2 [Msun] logMBH Fiducial virial black hole mass
53- 57 F5.2 [-] logEdd Eddington ratio based on the fiducial
virial black hole mass
59- 64 F6.3 [W] logLbol Bolometric luminosity
66- 71 F6.3 mag W3mag Magnitude of WISE W3 band
73- 80 E8.3 mW/m2/Hz FluxW3 Flux of WISE W3 band
82- 90 F9.6 [W] logv3Lv3 Luminosity of WISE W3 band
92-100 F9.6 [W] LIR MIR luminosity
102-112 F11.9 --- R Ratio of MIR luminosity to bolometric
luminosity
114-125 F12.8 deg RArdeg Right ascension, geometrical centre of lobes
(J2000)
127-138 F12.8 deg DErdeg Declination, geometrical centre of lobes
(J2000)
140-145 F6.4 Jy Flobe Total lobe flux
147-152 F6.4 Jy Fcore ?=0 Core flux (zero if no core is detected)
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Byte-by-byte Description of file: rqsample.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- SDSS SDSS nanme from DR7 (HHMMSS.ss+DDMMSS.s)
20- 28 F9.5 deg RAdeg Right ascension (J2000)
30- 38 E9.5 deg DEdeg Declination (J2000)
40- 45 F6.4 --- z Redshift
47- 51 F5.2 [Msun] logMBH Fiducial virial black hole mass
53- 57 F5.2 [-] logEdd Eddington ratio based on the fiducial
virial black hole mass
59- 64 F6.3 [W] logLbol Bolometric luminosity
66- 71 F6.3 mag W3mag Magnitude of WISE W3 band
73- 80 E8.3 mW/m2/Hz FluxW3 Flux of WISE W3 band
82- 92 F11.8 [W] logv3Lv3 Luminosity of WISE W3 band
94-102 F9.6 [W] LIR MIR luminosity
104-115 F12.9 --- R Ratio of MIR luminosity to bolometric
luminosity
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 07-Dec-2017