The Population of High Redshift AGNs in the Chandra COSMOS survey

Details The Population of High Redshift AGNs in the Chandra COSMOS survey The Population of High Redshift AGNs in the Chandra COSMOS survey

2011-03-14

arxiv.org/abs/1103.2570v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 6 figures. ApJ in press. Table 3 is available in the published version

Scientific paper

We present the high redshift (33. 81 sources are selected in the 0.5-2 keV band, 14 are selected in the 2-10 keV and 6 in the 0.5-10 keV bands. We sample the high luminosity (log L_(2-10 keV)>44.15 erg/s) space density up to z~5 and a fainter luminosity range (43.53. We find that the space density of high-luminosity AGNs declines exponentially at all the redshifts, confirming the trend observed for optically selected quasars. At lower luminosity, the measured space density is not conclusive, and a larger sample of faint sources is needed. Comparisons with optical luminosity functions and BH formation models are presented together with prospects for future surveys.

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