Access to Astronomical Catalogues

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