期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 339, 期 4, 页码 1095-1102出版社
OXFORD UNIV PRESS
DOI: 10.1046/j.1365-8711.2003.06259.x
关键词
galaxies : active; galaxies : evolution; diffuse radiation; infrared : galaxies; X-rays : galaxies
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-Newton 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 active galactic nuclei and star-forming activity.
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