X-Ray Weak Quasars:. Absorption or AN Intrinsically Different Sed?

Details X-Ray Weak Quasars:. Absorption or AN Intrinsically Different Sed? X-Ray Weak Quasars:. Absorption or AN Intrinsically Different Sed?

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mas..conf..275r&link_type=abstract

MULTIWAVELENGTH AGN SURVEYS. Proceedings of the Guillermo Haro Conference 2003. Held 8-12 December 2003 in Cozumel, Mexico. Edit

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Chandra and XMM-Newton spectra, and optical and IR photometry of a sample of spectroscopically selected X-ray weak quasars. We discuss intrinsically different SEDs and obscuration as the two possible explanations for the low observed X-ray to optical ratio. We show that there is no obvious way to reproduce the observational data assuming an intrinsically standard emission and some kind of obscuration, even allowing for a dust-to-gas ratio different from Galactic. We conclude that our objects are likely to represent a class of intrinsically peculiar quasars, with a low X-ray emission and relatively red optical colors.

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