Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..139..575w&link_type=abstract
Astronomy and Astrophysics Supplement, v.139, p.575-599
Astronomy and Astrophysics
Astrophysics
32
Surveys, X-Rays: General, X-Rays: Galaxies, Galaxies: Active
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 log C + 0.4 R as an alternative expression for log (f_X/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.
Dong Xiao-Yi
Hu Jiang-Yao
Wei Jian-Yan
Xu D.-W.
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