Chandra observations of X-ray weak Quasars

Details Chandra observations of X-ray weak Quasars Chandra observations of X-ray weak Quasars

2003-03-04

arxiv.org/abs/astro-ph/0303080v2

Astrophys.J. 587 (2003) L9-L14

Astronomy and Astrophysics

Astrophysics

11 Pages, 3 figures, accepted for publication in ApJ Letters

Scientific paper

10.1086/375048

We present Chandra observations of 18 spectroscopically selected quasars, already known to be X-ray weak from previous ROSAT observations. All the sources but one are detected by Chandra, and spectral analysis suggests that most of them are intrinsically underluminous in the X-rays (by a factor from 3 to >100). These objects could represent a large population of quasars with a Spectral Energy Distribution different from that of standard blue quasars. We discuss the possibility that a significant fraction of the obscured AGN needed in Synthesis models of the X-ray background could be instead optically broad-line, X-ray weak quasars.

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