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Cross-correlation of the X-ray background with nearby galaxiesThe detection of a signal in the cross-correlation of the diffuse 2-10 keV HEAO 1 A-2 X-ray surface brightness with the galaxy surface density derived from diameter-limited samples from the Uppsala General Catalogue is reported. An ad hoc relationship between the X-ray flux and the galaxy counts is used to estimate the local X-ray volume emissivity at 2.8 + or - 1.0 x 10 to the 38th ergs/s/cu Mpc. This result implies that unevolved populations of X-ray sources correlated with present-epoch galaxies can contribute only 13 + or - 5 percent of the cosmic X-ray background.
Document ID
19910067044
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Jahoda, Keith
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mushotzky, Richard F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Boldt, Elihu
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lahav, Ofer
(Cambridge University Institute of Astronomy, England; Institute for Advanced Study, Princeton, NJ, United States)
Date Acquired
August 14, 2013
Publication Date
September 10, 1991
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 378
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A51667
Funding Number(s)
CONTRACT_GRANT: NSF AST-88-02533
Distribution Limits
Public
Copyright
Other

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