HEAD 2003 Meeting
Session 21. Active Galactic Nuclei III
Poster, Sunday-Wednesday, March 23, 2003, Duration of Meeting

[Previous] | [Session 21] | [Next]

[21.04] A Chandra mini-survey of X-ray weak quasars.

G. Risaliti, M. Elvis (Harvard-Smithsonian Center for Astrophysics), A. Marconi, M. Salvati (Arcetri Observatory, ITALY)

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

The author(s) of this abstract have provided an email address for comments about the abstract: grisaliti@cfa.harvard.edu

[Previous] | [Session 21] | [Next]

Bulletin of the American Astronomical Society, 35#2
© 2003. The American Astronomical Soceity.