Astronomy and Astrophysics – Astronomy
Scientific paper
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.
Burg Richard
Giacconi Ricardo
Huchra John
Murray Stephen S.
Primini Francis A.
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