On the Exotic Hard X-ray Source Populations in the Hellas2XMM survey

Details On the Exotic Hard X-ray Source Populations in the Hellas2XMM survey On the Exotic Hard X-ray Source Populations in the Hellas2XMM survey

2005-04-12

arxiv.org/abs/astro-ph/0504278v1

Astronomy and Astrophysics

Astrophysics

On behalf of the HELLAS2XMM Collaboration, 6 pages, 4 figures, contribution to the Proceedings of the COSPAR Scientific Assemb

Scientific paper

Recent hard X-ray surveys have proven to be effective in discovering large numbers of X-ray sources that, despite the likely association with active nuclei, appear to be characterized by "peculiar" properties. Among these "exotic" source populations, we will focus on the nature of two classes of hard X-ray sources: those characterized by high X-ray-to-optical flux ratios -- a fraction of these are associated with the rather elusive Type 2 quasars -- and the X-ray bright optically normal galaxies, also known as XBONGs.

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