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Title:
A high-sensitivity X-ray survey using the Einstein Observatory and the discrete source contribution to the extragalactic X-ray background
Authors:
Giacconi, R.; Bechtold, J.; Branduardi, G.; Forman, W.; Henry, J. P.; Jones, C.; Kellogg, E.; van der Laan, H.; Liller, W.; Marshall, H.; Murray, S. S.; Pye, J.; Schreier, E.; Sargent, W. L. W.; Seward, F.; Tananbaum, H.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AD(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AE(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AF(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AG(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AH(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.; Leiden, Sterrewacht, Leiden, Netherlands)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Nov. 15, 1979, p. L1-L7. Research supported by the Science Research Council of England. (ApJ Homepage)
Publication Date:
11/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BACKGROUND RADIATION, COSMIC RAYS, HEAO 2, X RAY SOURCES, ASTRONOMICAL OBSERVATORIES, EXTRATERRESTRIAL RADIATION, SENSITIVITY
Comment:
A&AA ID. AAA026.142.123
DOI:
10.1086/183099
Bibliographic Code:
1979ApJ...234L...1G

Abstract

Surveys of two fields have been carried out utilizing the X-ray imaging instruments of the Einstein Observatory to a limiting flux of 1.3 x 10 to the -14th ergs/sq cm s in the 1-3 keV band, a several hundred-fold increase in sensitivity with respect to previous surveys. Forty-three objects are observed with positional accuracies varying from 5 to 60 arcsec. Optical and radio studies of candidate counterparts are described. The number-intensity relationship for extragalactic sources is evaluated, and the consequences of the findings are discussed with particular emphasis on the discrete source contribution to the extragalactic X-ray background. It is concluded that a large fraction of the background is due to previously unresolved discrete sources.

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