Southern Extension of Optical Identification of the ASCA Medium Sensitivity Survey

Details Southern Extension of Optical Identification of the ASCA Medium Sensitivity Survey Southern Extension of Optical Identification of the ASCA Medium Sensitivity Survey

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..128a&link_type=abstract

NOAO Proposal ID #2001B-0128

Computer Science

Scientific paper

In order to expand a sample of bright hard X-ray sources, here we propose spectroscopic observations for optical identification of 24 hard X-ray sources detected in the ASCA Medium Sensitivity Survey in the southern sky (AMSSs). AMSS is a serendipitous source survey, based on 176 ASCA pointing observations covering 60 deg^2 of the sky. The flux limit is ~ 3×10^-13 erg s^-1 cm^-2 in the 2-10 keV band. The sample contains 118 hard X-ray sources in total. Because surface number density of such bright sources is low, the sample of bright hard X-ray sources is still unique, even in comparison with surveys with Chandra and XMM-Newton satellites for studies of luminous absorbed AGNs in the intermediate redshift universe. In the northern sky (AMSSn), we finished optical identification of all 94 hard X-ray sources, except for 4 sources. 70% and 15% of the sources were identified with broad-line and narrow-line AGNs, respectively. Non-detection of type-2 QSOs in the sample suggests deficiency of narrow-line AGN with high-luminosity. In order to expand the sample of bright hard sources as large as possible, here we propose to extend the optical identification program to the southern sky.

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