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

Details The nature of the intermediate redshift optically red X-ray population The nature of the intermediate redshift optically red X-ray population

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.0302g&link_type=abstract

American Astronomical Society, HEAD meeting #8, #03.02; Bulletin of the American Astronomical Society, Vol. 36, p.907

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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