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J/ApJ/726/20 X-ray emission from quasars (Miller+, 2011)
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Beginning of ReadMe :J/ApJ/726/20 X-ray emission from quasars (Miller+, 2011)
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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
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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.