RASS AGN sample (Wei+, 1999)

Details RASS AGN sample (Wei+, 1999) RASS AGN sample (Wei+, 1999)

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ycat..41390575w&link_type=abstract

VizieR On-line Data Catalog: J/A+AS/139/575. Originally published in: 1999A&AS..139..575W

Physics

X-Ray Sources, Active Gal. Nuclei, Magnitudes, Redshifts

Scientific paper

We present the first results of a program to identify the unknown bright active galactic nuclei (AGN) in the ROSAT All Sky Survey Bright Source Catalog (RASS-BSC). We have used logC+0.4R as an alternative expression for log(fX/fopt), where C is X-ray count rate and R stands for R magnitude. Then a high X-ray-to-optical flux ratio criterion has been used to select an AGN sample with 165 unidentified X-ray sources for optical spectroscopy. Those 165 X-ray sources have been identified in the following classes: 115 emission line AGN (QSOs and Seyferts), 2 BL Lac objects and 4 BL Lac candidates, 22 clusters of galaxies, 12 Galactic stars and 10 objects remain unidentified. This represent a success rate of about 73% for detecting AGN using our selection criteria. Plausibility is based upon the optical classification and X-ray characteristics of the sources. (1 data file).

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