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[3.02] The nature of the intermediate redshift optically red X-ray population

A. Georgakakis, I. Georgantopoulos (National Athens Observatory)

A striking result from X-ray surveys with the Chandra and the XMM-Newton is that a non-negligible fraction of the X-ray population is identified with optically extended sources suggesting intermediate redshift (z<1) galaxies. A large fraction of these systems have red optical colours suggesting either obscuration or an evolved stellar component.

In this paper we explore the nature of this enigmatic X-ray population using a wide area (about 6 sq. deg.) XMM-Newton survey combining both archival and proprietary observations that overlap with the Sloan Digital Sky Survey. The high quality optical and X-ray data available allow us to assess the fraction of obscured AGNs within these sources, estimate their mean X-ray spectral properties, investigate their significance as an XRB component, construct their luminosity function and explore their evolution with redshift.

The author(s) of this abstract have provided an email address for comments about the abstract: age@astro.noa.gr

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Bulletin of the American Astronomical Society, 36 #3
© 2004. The American Astronomical Soceity.