X-ray background synthesis: the infrared connection

Details X-ray background synthesis: the infrared connection X-ray background synthesis: the infrared connection

2002-11-06

arxiv.org/abs/astro-ph/0211129v1

Mon.Not.Roy.Astron.Soc.339:1095,2003

Astronomy and Astrophysics

Astrophysics

9 pages, 8 figures, MNRAS accepted

Scientific paper

10.1046/j.1365-8711.2003.06259.x

We present a synthesis model of the X-ray background based on the cross-correlation between mid-infrared and X-ray surveys, where the distribution of type 2 sources is assumed to follow that of luminous infrared galaxies while type 1 sources are traced by the observed ROSAT distribution. The best fits to both the X-ray number counts and background spectrum require at least some density evolution. We explore a limited range of parameter space for the evolutionary variables of the type 2 luminosity function. Matching the redshift distribution to that observed in deep Chandra and XMM fields, we find weak residuals as a signature of Fe emission from sources in a relatively peaked range of redshift. This extends the recent work of Franceschini et al., and emphasizes the possible correlation between obscured AGN and star-forming activity.

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