Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..470..256h&link_type=abstract
The 9th astrophysics conference: After the dark ages, when galaxies were young (the Universe at 2<Z<5). AIP Conference Proceedi
Astronomy and Astrophysics
Astrophysics
1
Background Radiations, Observational Cosmology, Active And Peculiar Galaxies And Related Systems, X-Ray
Scientific paper
Deep X-ray surveys using ROSAT, ASCA and BeppoSAX have resolved a significant fraction of the cosmic X-ray background (XRB) into discrete sources and optical identifications are demonstrating that the XRB is largely due to accretion onto massive black holes, integrated over cosmic time. The deep soft X-ray surveys have detected a larger surface density of AGN than in any other waveband and find significant evolution in the space density of high-luminosity AGN contrary to the pure luminosity evolution which was the standard assumption so far. Considerable uncertainties still exist for the evolution of low-luminosity AGN. These findings are consistent with the notion that most larger galaxies contain black holes many of which have been active in the past. Of particular interest in the context of this conference is the space density of high-redshift AGN, which is consistent with a constant value in the range 2
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