Access to Astronomical Catalogues

J/ApJS/183/17        The SDSS DR5/XMM-Newton quasar survey        (Young+, 2009)
The Fifth Data Release Sloan Digital Sky Survey/XMM-Newton Quasar Survey.
    Young M., Elvis M., Risaliti G.
   <Astrophys. J. Suppl. Ser., 183, 17-32 (2009)>
   =2009ApJS..183...17Y
ADC_Keywords: QSOs ; X-ray sources ; Radio sources ; Redshifts ; Spectroscopy

Keywords: accretion, accretion disks - quasars: general


Abstract:
    We present a catalog of 792 Fifth Data Release Sloan Digital Sky
    Survey quasars with optical spectra that have been observed
    serendipitously in the X-rays with the XMM-Newton. These quasars cover
    a redshift range of z=0.11-5.41 and a magnitude range of i=15.3-20.7.
    Substantial numbers of radio-loud (70) and broad absorption line (51)
    quasars exist within this sample. Significant X-ray detections at
    ≥2σ account for 87% of the sample (685 quasars), and 473
    quasars are detected at ≥6σ, sufficient to allow X-ray spectral
    fits. For detected sources, ∼60% have X-ray fluxes between
    F2-10keV=(1-10)x10-14erg/cm2/s. We fit a single power law, a
    fixed power law with intrinsic absorption left free to vary, and an
    absorbed power-law model to all quasars with X-ray signal-to-noise
    ratio ≥6, resulting in a weighted mean photon index
    Γ=1.91±0.08, with an intrinsic dispersion
    σΓ=0.38.

Description:
    As the DR5 quasar catalog (Schneider et al. 2007, Cat. VII/252) was
    not yet available at the time of selection, we selected quasars with
    optical spectra directly from the DR5 SDSS database (Cat. II/276).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        85      792   Properties of SDSS quasars with archival
                             XMM-Newton observations
                              (from erratum, ApJS, 785, 250)
table2.dat       151      792   X-ray spectral data of SDSS quasars
                              (from erratum, ApJS, 785, 250)


See also:
        B/xmm     : XMM-Newton Observation Log (XMM-Newton SOC, 2009)
        VII/252   : SDSS-DR5 quasar catalog (Schneider+, 2007)
  J/A+A/363/141   : Radio-loud galaxies in the ROSAT survey. IV. (Reich+, 2000)
  J/A+A/427/387   : QORG catalog of radio/X-ray sources (Flesch+, 2004)
  J/ApJS/165/1    : BAL QSOs from SDSS DR3 (Trump+, 2006)
  J/ApJ/665/990   : SDSS DR2 BAL QSOs (Ganguly+, 2007)
  J/MNRAS/382/412 : Catalog of SDSS-DR5/2MASS spectroscopic quasars (Ofek, 2007)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units    Label     Explanations

   1- 18  A18   ---      SDSS      SDSS object name (HHMMSS.ss+DDMMSS.s)
  20- 29  I10   ---      XMMid     XMM Observation ID
  31- 35  F5.3  ---      z         Redshift
  37- 44  E8.2 10+20/cm2 NHgal     Galactic hydrogen column density in the
                                    direction of the source
  46- 50  F5.1  ---      SNRX      X-ray signal-to-noise
  52- 56  F5.1  ks       ExpTime   "Live" exposure time of X-ray observation (1)
  58- 62  F5.1  arcmin   OAA       Off-axis angle
  64- 72  F9.1  ct       Cnet      Net source counts
  74- 79  F6.1  ct       Cbkg      Background counts; scaled to source
                                    extraction region
      82  A1    ---      RL        [012] Radio-loud flag (2)
      85  A1    ---      BAL       [01] Broad absorption line (BAL) flag (3)

Note (1): Indicates the exposure time left after intervals of flaring
          high-energy background have been removed.
Note (2): Radio-loud defined as RLP=f(5GHz)/f(440nm)>10 (rest frame; e.g.,
     Kellermann et al., 1989AJ.....98.1195K). The rest-frame 5GHz flux
     density is computed from the observed-frame 1.4GHz flux density
     assuming a radio power-law slope of α=-0.8, with
     f(ν)∝να.
     The numbers have the following meaning:
    0 = Radio-quiet sources
    1 = Radio-loud sources
    2 = Radio-loudness is undetermined (RLP is an upper-limit and >10).
Note (3): Broad absorption line (BAL) criteria are defined in Shen et al.
     (2008ApJ...677..858S). The value 1 indicates a BAL quasar, and
     0 a non-BAL quasar


Byte-by-byte Description of file: table2.dat

   Bytes Format Units      Label   Explanations

   1- 18  A18   ---        SDSS    SDSS object name
  20- 27  E8.2  mW/m2      FsoftO  ?=0.00 Observed-frame flux in 0.5-2keV band
  29- 36  E8.2  mW/m2      FhardO  ?=0.00 Observed-frame flux in 2-10keV band
  38- 45  E8.2  mW/m2      FsoftR  ?=0.00 Rest-frame flux in 0.5-2keV band
  47- 54  E8.2  mW/m2      FhardR  ?=0.00 Rest-frame flux in 2-10keV band
  56- 63  E8.2  10-7W      LsoftR  ?=0.00 Rest-frame luminosity in
                                          0.5-2keV band (1)
  65- 72  E8.2  10-7W      LhardR  ?=0.00 Rest-frame luminosity in
                                          2-10keV band (1)
  74- 78  F5.2  ---        aox     ?=9.99 Optical-to-X-ray spectral index (2)
  80- 81  I2    ---        Xfit    Flag indicating X-ray fit (3)
  84- 90  F7.2  ---        Gam     ?=-999 X-ray photon index for best-fit model
  93- 99  F7.2  ---        Gam.l   ?=-999 The 90% lower value of X-ray photon
                                   index interval
 102-108  F7.2  ---        Gam.u   ?=-999 The 90% upper value of X-ray photon
                                   index interval
 110-118  E9.2  10+22/cm2  NH      ?=-9.99e+02 Intrinsic X-ray absorption
 120-128  E9.2  10+22/cm2  NH.l    ?=-9.99e+02 The 90% lower value on intrinsic
                                   X-ray absorption interval
 130-138  E9.2  10+22/cm2  NH.u    ?=-9.99e+02 The 90% upper value of intrinsic
                                   X-ray absorption interval
 140-146  F7.1  ---        chi2    Chi-square value for best-fit model
 148-151  I4    ---        dof     Degrees of freedom for best-fit model

Note (1): Luminosities are computed using H0=70km/s/Mpc, ΩM=0.3,
          and ΩΛ=0.7.
Note (2): aox is defined as log(L(2keV)/L(250nm))/log(E(2keV)/E(250nm)).
     The value is listed as 9.99 if the fit to the X-ray spectrum did not
     converge properly, resulting in bad/null X-ray fluxes.
Note (3): X-Ray fit flags as follows:
 -1 = Undetected source ; upper-limits on flux and luminosity values are listed.
  0 = Detected source with S/N<6 ; detected flux and luminosity values 
      are listed.
  1 = Sources with S/N>6 and a single power-law model (SPL) is preferred;
      the SPL power-law parameters are listed, as well as the 90% upper
      limit on intrinsic absorption from the intrinsically absorbed 
      power-law (APL) model.
  2 = Sources with S/N>6 and a fixed power-law (FPL) model with variable 
      NH is preferred. The best-fit slope from the SPL is listed, 
      as well as the best-fit NH from the FPL model.
  3 = Sources with S/N>6 and the APL model is preferred; 
      the APL power-law and absorption parameters are listed.


History:
    From electronic version of the journal
(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    05-Jan-2010