AGN Population at 10-13 erg s-1 cm-2: Results from Optical Identification of ASCA Surveys
Abstract
In this paper, results of optical identification of ASCA surveys are summarized. To understand luminous AGNs in the z<1 universe, the ASCA AGN sample is still better than samples of AGNs from deep Chandra or XMM-Newton surveys. Combining the identified sample of AGNs from ASCA Large Sky Survey and Medium Sensitivity Survey, the sample of hard X-ray selected AGNs have been expanded up to about 80 AGNs above the flux limit of 10-13 erg s-1 cm-2 in the 2-10keV band. One fifth of the ASCA AGNs are absorbed narrow-line AGNs. The luminosity distribution of the absorbed AGNs is limited below 1045 erg s-1, though there are 14 non-absorbed broad-line AGNs are detected above the luminosity. The result suggests lack of absorbed luminous AGNs (deficiency of type 2 QSO).
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