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The CfA Einstein Observatory extended deep X-ray surveyAll 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.
Document ID
19910056258
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Primini, F. A. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Murray, S. S. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Huchra, J. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Schild, R. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Burg, R. (Space Telescope Science Institute Baltimore, MD, United States)
Date Acquired
August 15, 2013
Publication Date
June 20, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 374
ISSN: 0004-637X
Subject Category
SPACE RADIATION
Funding Number(s)
CONTRACT_GRANT: NAS8-30751
CONTRACT_GRANT: NAG8-530
Distribution Limits
Public
Copyright
Other