SIMBAD references

1998A&A...329..495S - Astronomy and Astrophysics, volume 329, 495-503 (1998/1-2)

The ROSAT deep survey. II. Optical identification, photometry and spectra of X-ray sources in the Lockman field.

SCHMIDT M., HASINGER G., GUNN J., SCHNEIDER D., BURG R., GIACCONI R., LEHMANN I., MacKENTY J., TRUEMPER J. and ZAMORANI G.

Abstract (from CDS):

The ROSAT Deep Survey includes a complete sample of 50 X-ray sources with fluxes in the 0.5-2keV band larger than 5.5x10–15erg/cm2/s in the Lockman field (Hasinger et al., Paper I). We have obtained deep broad-band CCD images of the field and spectra of many optical objects near the positions of the X-ray sources. We define systematically the process leading to the optical identifications of the X-ray sources. For this purpose, we introduce five identification (ID) classes that characterize the process in each case. Among the 50 X-ray sources, we identify 39 AGNs, 3 groups of galaxies, 1 galaxy and 3 galactic stars. Four X-ray sources remain unidentified so far; two of these objects may have an unusually large ratio of X-ray to optical flux.

Abstract Copyright:

Journal keyword(s): surveys - galaxies: active - quasars: emission lines - galaxies: Seyfert - X-rays: galaxies

Nomenclature: Table 1: RDS NNNA N=46

Simbad objects: 53

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