AGN Populations from Optical Identification of ASCA Surveys
Abstract
In this paper, properties of AGNs obtained from optical identification of ASCA surveys are discussed. To understand luminous AGNs in the z < 1 universe, the ASCA AGN samples are 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 80 AGNs above the flux limit of 10-13 erg s-1 cm-2 in the 2-10 keV hard X-ray 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 detected above the luminosity. The result suggests lack of absorbed luminous AGNs (deficiency of type-2 QSO).
- Publication:
-
IAU Colloq. 184: AGN Surveys
- Pub Date:
- 2002
- DOI:
- 10.48550/arXiv.astro-ph/0201495
- arXiv:
- arXiv:astro-ph/0201495
- Bibcode:
- 2002ASPC..284..245A
- Keywords:
-
- Astrophysics
- E-Print:
- 6 pages with 4 figures, to appear in the proceeding of IAU Colloquium 184 "AGN Surveys" (18-22 June 2001, Armenia)