SIMBAD references

1999A&AS..139..575W - Astron. Astrophys., Suppl. Ser., 139, 575-599 (1999/November-1)

An AGN sample with high x-ray-to-optical flux ratio from RASS. I. The optical identification.

WEI J.Y., XU D.W., DONG X.Y. and HU J.Y.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): surveys - X-rays: general - X-rays: galaxies - galaxies: active

VizieR on-line data: <Available at CDS (J/A+AS/139/575): table2.dat>

Nomenclature: Table 2: [WXD99] JHHMMSS.ss+DDMMSS.s N=174.

Simbad objects: 193

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2019.10.18-02:03:46

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