Abstract
We present the rst 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 : 4Ras an alterna- tive 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 unidentied X-ray sources for op- tical spectroscopy. Those 165 X-ray sources have been identied in the following classes: 115 emission line AGN (QSOs and Seyferts), 2 BL Lac objects and 4 BL Lac can- didates, 22 clusters of galaxies, 12 Galactic stars and 10 objects remain unidentied. This represent a success rate of about 73% for detecting AGN using our selection cri- teria. Plausibility is based upon the optical classication and X-ray characteristics of the sources.
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