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Xu D. W, Wei J. Y, Dong X. Y, Hu J. Y. High X-Ray-to-Optical Flux Ratio Sources From RASS[J]. Astronomical Techniques and Instruments, 1999, (S1): 311-313.
Citation: Xu D. W, Wei J. Y, Dong X. Y, Hu J. Y. High X-Ray-to-Optical Flux Ratio Sources From RASS[J]. Astronomical Techniques and Instruments, 1999, (S1): 311-313.
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High X-Ray-to-Optical Flux Ratio Sources From RASS

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  • 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 (RASSBSC).We have used lgC+04 R as an alternative expression for lg(fxfopt), 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 fo roptical spect roscopy.At present over 93% of the X-ray sources in the sample have been fully identified in the following classes:emission line AGNs, clusters of galaxies, BLLacertae objects, and stars.
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