J/ApJ/726/20 X-ray emission from quasars (Miller+, 2011)
X-ray emission from optically selected radio-intermediate and radio-loud quasars. Miller B.P., Brandt W.N., Schneider D.P., Gibson R.R., Steffen A.T., Wu J. <Astrophys. J., 726, 20 (2011)> =2011ApJ...726...20M
ADC_Keywords: Photometry, SDSS ; Redshifts ; QSOs ; Radio sources ; X-ray sources Keywords: galaxies: active - quasars: general Abstract: We present the results of an investigation into the X-ray properties of radio-intermediate and radio-loud quasars (RIQs and RLQs, respectively). We combine large, modern optical (e.g., SDSS) and radio (e.g., FIRST) surveys with archival X-ray data from Chandra, XMM-Newton, and ROSAT to generate an optically selected sample that includes 188 RIQs and 603 RLQs. This sample is constructed independently of X-ray properties but has a high X-ray detection rate (85%); it provides broad and dense coverage of the l-z plane, including at high redshifts (22% of objects have z=2-5), and it extends to high radio-loudness values (33% of objects have R*=3-5, using logarithmic units). We measure the "excess" X-ray luminosity of RIQs and RLQs relative to radio-quiet quasars (RQQs) as a function of radio loudness and luminosity, and parameterize the X-ray luminosity of RIQs and RLQs both as a function of optical/UV luminosity and also as a joint function of optical/UV and radio luminosity. RIQs are only modestly X-ray bright relative to RQQs; it is only at high values of radio loudness (R*≳3.5) and radio luminosity that RLQs become strongly X-ray bright. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 85 654 Primary sample radio-intermediate (RIQs) and radio-lound (RLQs) quasars table2.dat 66 31 RIQs and RLQs selected from deep surveys
See also: VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) J/A+A/535/A80 : Type-2 QSOs in XMM-COSMOS (Mainieri+, 2011) J/ApJS/191/124 : Optical spectroscopy of ECDF-S sources (Silverman+, 2010) J/ApJS/187/560 : Photometric redshifts of the 2Ms CDF-S (Luo+, 2010) J/ApJ/720/368 : Color-magnitude relations of galaxies in CDFs (Xue+, 2010) J/ApJS/180/67 : Photometric selection of QSOs from SDSS. II. (Richards+, 2009) J/ApJ/696/1195 : COSMOS AGN spectroscopic survey. I. (Trump+, 2009) J/ApJ/698/1095 : The FIRST-2MASS red QSO survey. II. (Urrutia+, 2009) J/ApJ/693/8 : High-redshift QSOs in the COSMOS survey (Brusa+, 2009) J/ApJ/689/687 : GOODS-N spectroscopic survey (Barger+, 2008) J/ApJS/179/1 : The OPTX project: CLANS, CLASXS and CDF-N (Trouille+, 2008) J/MNRAS/391/369 : New z≥3.6 QSOs from FIRST-SDSS DR5 (Carballo+, 2008) J/ApJ/644/100 : SDSS quasars in the COSMOS field (Prescott+, 2006) J/A+A/437/883 : K20 survey: spectroscopic catalogue (Mignoli+, 2005) J/ApJS/155/271 : CDF-South: Optical spectroscopy (Szokoly+, 2004) J/AJ/126/632 : UBVRIz'HK' photometry of 2Ms CDFN sources (Barger+, 2003) J/AJ/121/1872 : FIRST radio-selected QSOs (Helfand+, 2001) J/ApJS/135/227 : The FIRST bright quasar survey. III. (Becker+, 2001) J/A+A/323/739 : ROSAT detected quasars. II. (Brinkmann+ 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 18 A18 --- Name Object name (HHMMSS.ss+DDMMSS.s; J2000, truncated coordinates) 20- 24 F5.3 --- z Redshift (1) 26- 30 F5.2 mag imag SDSS PSF i-band magnitude corrected for Galactic absorption 32- 36 F5.2 mag d(i-g) Object (g-i) minus typical (g-i) of similar z SDSS quasars 38- 42 F5.2 [10-7W/Hz] logLR Log of Radio luminosity (G1) 44- 48 F5.2 [10-7W/Hz] logL Log of optical/UV luminosity (G1) 50- 54 F5.2 [10-7W/Hz] logLX Log of X-ray luminosity (G1) 56 I1 --- X [0/1] X-ray detection flag (1=X-ray detected or 0=X-ray upper limit (95% confidence)) 58- 61 F4.2 [-] RL Radio loudness (G2) 63- 67 F5.2 --- aox Optical/UV-to-X-ray spectral slope αox (aox=0.384*(log(LX/L))) 69- 73 F5.2 --- ar ?=0 Radio spectral slope α_r_ (2) 75 A1 --- l_logLRc [<] Core detection flag: < = core not in FIRST catalog or blank = core in FIRST catalog 77- 81 F5.2 [10-7W/Hz] logLRc Core radio luminosity (3) 83 A1 --- of [SP] Optical selection flag (4) 85 A1 --- Xc X-ray coverage flag (5)
Note (1): Spectroscopic if available from SDSS-DR5 or NED, otherwise photometric from Richards et al. (2009, Cat. J/ApJS/180/67) Note (2): calculated between 1.4 and 5GHz where Green Bank fluxes are available and is otherwise based on low-frequency (Texas and Westerbork) surveys. Values of 0.00 indicate a lack of multifrequency data. Note (3): Limits calculated for 1mJy at 1.4GHz. Note (4): Optical flag as follows: S = spectroscopic, from Schneider et al. (2007, Cat. VII/252; superseded by Cat. VII/260); P = photometric, from Richards et al. (2009, Cat. J/ApJS/180/67). Note (5): X-ray flag as follows: C = Chandra catalog; X = XMM-Newton catalog; c = our Chandra measurement; x = our XMM-Newton measurement; r = Rosat.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 A2 --- S [C /BL] Selection set (C = color selected or BL = Broad-line selected) 4- 22 A19 --- Name Object name (HHMMSS.ss+DDMMSS.s; J2000, truncated optical coordinates) 23- 27 F5.3 --- z Redshift 29- 33 F5.2 mag imag i-band magnitude 35- 39 F5.2 [10-7W/Hz] logLR Log of Radio luminosity (G1) 41- 45 F5.2 [10-7W/Hz] logL Log of optical/UV luminosity (G1) 47 A1 --- l_logLX Limit flag on logLX 48- 52 F5.2 [10-7W/Hz] logLX Log of X-ray luminosity (G1)(1) 54- 57 F4.2 [---] RL Radio loudness (G2) 59 A1 --- l_aox Limit flag on aox 60- 64 F5.2 --- aox Optical/UV-to-X-ray spectral slope αox (aox=0.384*(log(LXL))) 66 I1 --- Ref ? Reference for redshift (2)
Note (1): X-ray luminosities are from Chandra observations except for the broad-line selected COSMOS objects, for which the X-ray luminosities are from XMM-Newton observations. See Section 2.2.3 for details. Note (2): References for redshifts (1-8 = spectroscopic) as follows: 1 = Luo et al. 2009ApJ...695.1227L; 2 = Mignoli et al. 2005, Cat. J/A+A/437/883; 3 = Silverman et al. 2010, Cat. J/ApJS/191/124; 4 = Szokoly et al. 2004, Cat. J/ApJS/155/271; 5 = Barger et al. 2003, Cat. J/AJ/126/632; 6 = Barger et al. 2008, Cat. J/ApJ/689/687; 7 = Trouille et al. 2008, Cat. J/ApJS/179/1; 8 = Trump et al. 2009, Cat. J/ApJ/696/1195. Unlabled redshift values are photometric from Luo et al. (2010, Cat. J/ApJS/187/560; CDF-S X-ray detections); Rafferty et al. ((2011ApJ...742....3R; X-ray limits and E-CDF-S detections); Xue et al. (2010, Cat. J/ApJ/720/368; CDF-N); and Ilbert et al. (2009ApJ...690.1236I; COSMOS).
Global notes: Note (G1): In units of erg/s/Hz at rest-frame 5GHz (logLR), 2500Å (logL), and 2keV (logX), respectively. Note (G2): Ratio of radio-to-optical/UV luminosities, expressed as a logarithm (i.e., RL=log(LR/L)).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 16-Aug-2012
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