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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 792 Properties of SDSS quasars with archival
XMM-Newton observations
(from erratum, ApJS, 185, 250)
table2.dat 151 792 X-ray spectral data of SDSS quasars
(from erratum, ApJS, 185, 250)
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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
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Bytes Format Units Label Explanations
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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)
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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 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 2008ApJ...677..858S). The value 1 indicates a BAL quasar, and
0 a non-BAL quasar
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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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.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Jan-2010