Subject: apparent magnitude / Publisher: CDS / Facility: ROSAT

ID:: ivo://CDS.VizieR/J/A+AS/126/509
Title:: HS 47.5/22: X-ray catalogue
Short Name:: J/A+AS/126/509
Date:: 21 Oct 2021
Publisher:: CDS
Description:: Table 4 contains the parameters of the PSPC pointings which form the medium deep survey in HS 47.5/22, table 5 is the final X-ray source catalogue, and table 6 gives the results of the optical follow-up observations.

ID:: ivo://CDS.VizieR/J/A+AS/139/575
Title:: RASS AGN sample
Short Name:: J/A+AS/139/575
Date:: 21 Oct 2021
Publisher:: CDS
Description:: 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(f_X_/f_opt_), 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.

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