The CfA Einstein Observatory extended deep X-ray survey

Details The CfA Einstein Observatory extended deep X-ray survey The CfA Einstein Observatory extended deep X-ray survey

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...374..440p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 374, June 20, 1991, p. 440-455.

Astronomy and Astrophysics

Astronomy

36

Extragalactic Radio Sources, Quasars, Sky Surveys (Astronomy), X Ray Analysis, X Ray Astronomy, Active Galactic Nuclei, Astronomical Photography, Signal To Noise Ratios

Scientific paper

All IPC exposures in the Einstein Extended Deep X-ray Survey program have been reanalyzed. The current survey covers about 2.3 sq deg with a typical limiting sensitivity of about 5 x 10 to the -14th ergs/sq cm/s in the energy range from 0.8-3.5 keV. A total of 25 IPC sources are detected above a threshold of 4.5 sigma. A total of 18 are detected independently in the HRI, leading to the identification of six with stars and 11 with extragalactic objects. The remaining sources are classified as extragalactic. The population of identified extragalactic objects is dominated by QSOs, with one or two possible clusters. The basic conclusions of the original survey remain unchanged.

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