A Chandra mini-survey of X-ray weak quasars.

Details A Chandra mini-survey of X-ray weak quasars. A Chandra mini-survey of X-ray weak quasars.

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.2104r&link_type=abstract

American Astronomical Society, HEAD meeting #7, #21.04; Bulletin of the American Astronomical Society, Vol. 35, p.636

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Chandra observations of 18 spectroscopically selected broad line quasars, already known to be soft X-ray weak from previous ROSAT observations. All the sources but one are detected by Chandra. Most objects are underluminous by a factor from 5 to >100 in the 2-10 keV band. The spectral analysis suggests that this low observed emission is mostly due to intrinsic weakness, while absorption can only play a minor role. We discuss the possibility that this population of quasars, intrinsically different from the ``normal'' one, is a significant contributor to the X-ray background.
This is partially supported by NASA Contract NAS8-39073 and NASA Grant GO2-3142X

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