The medium sensitivity survey - A new sample of X-ray sources with optical identifications and the revised extragalactic log N-log S

Details The medium sensitivity survey - A new sample of X-ray sources with optical identifications and the revised extragalactic log N-log S The medium sensitivity survey - A new sample of X-ray sources with optical identifications and the revised extragalactic log N-log S

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..495g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. 495-511. Research supported by the Consiglio Naziona

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Galactic Nuclei, Heao 2, Quasars, Seyfert Galaxies, X Ray Sources, Astronomical Photometry, Bl Lacertae Objects, Cosmology, Red Shift, Space Density, X Ray Spectra

Scientific paper

The Einstein Observatory Medium Sensitivity Survey has been extended. 49 new, high galactic latitude X-ray sources have been detected in ≡150 IPC fields (≡40 deg2) with sensitivities in the range 7×10-14 to 2×10-12ergs cm-2s-1. The optical program undertaken to identify these new sources has yielded a virtual 100% identification rate. These sources have been combined with those previously selected resulting in a sample of 112 serendipitous X-ray sources. Of these, 75% are associated with extragalactic objects, and 25% are identified with galactic stars. Active galactic nuclei (AGNs-quasars and Seyfert galaxies) constitute the large majority of the extragalactic population (68%). The log N-log S relations for the two classes of objects for which enough statistics are present, AGNs and clusters of galaxies, have been computed.

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