ASCA AGN optical identifications (Akiyama+, 2003)

Details ASCA AGN optical identifications (Akiyama+, 2003) ASCA AGN optical identifications (Akiyama+, 2003)

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ycat..21480275a&link_type=abstract

VizieR On-line Data Catalog: J/ApJS/148/275. Originally published in: 2003ApJS..148..275A

Computer Science

X-Ray Sources, Active Gal. Nuclei, Photometry: Infrared, Equivalent Widths

Scientific paper

We present the results of optical spectroscopic identifications of a bright subsample of 2-10keV hard X-ray-selected sources from the ASCA Medium Sensitivity Survey in the northern sky (AMSSn). The flux limit of the subsample is 3x10-13erg/s/cm2 in the 2-10keV band. All but one of the 87 hard X-ray-selected sources are optically identified, with AGNs (including broad-line AGNs, narrow-line AGNs, and three BL Lac objects), seven clusters of galaxies, and one galactic star. It is the largest complete sample of hard X-ray-selected AGNs at the bright flux limit. Amounts of absorption to their nuclei are estimated to be hydrogen column densities (NH) of up to 3x1023cm-2 from their X-ray spectra. Optical properties of X-ray absorbed AGNs with NH>1x1022cm-2 indicate the effects of dust absorption: at redshifts z<0.6, AGNs without broad H{beta} emission lines have significantly larger NH-values than AGNs with broad H{beta} emission lines. At z>0.6, the X-ray absorbed AGNs have a large hard X-ray to optical flux ratio (logf2-10keV/fR>+1). However, three X-ray absorbed z>0.6 AGNs show strong broad lines. In combination with hard X-ray-selected AGN samples from the ASCA Large Sky Survey, the ASCA Deep Survey in the Lockman Hole, and Chandra Deep Field North, the luminosity distributions of absorbed (NH>1x1022cm-2) and less-absorbed (NH<1x1022cm-2) AGNs are compared.
(4 data files).

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