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Science 21 April 1967:
Vol. 156. no. 3773, pp. 374 - 378
DOI: 10.1126/science.156.3773.374
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Articles

Distribution and Variability of Cosmic X-Ray Sources

H. Friedman 1, E. T. Byram 1, and T. A. Chubb 1

1 E. O. Hurlburt Center for Space Research, Naval Research Laboratory, Washington, D.C. 20390

At least 30 discrete cosmic x-ray sources have been detected thus far. The distribution is concentrated toward the galactic plane, and most of the sources are believed to lie within 2 kiloparsecs of the sun. It is estimated that the average luminosity of the observed sources is about 5 x 1036 ergs per second and that the entire galaxy contains about 1250 such sources. Comparisons of fluxes observed over the course of the past 2 years reveal that many sources are highly variable.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Relativistic Astrophysics.
S. P. Maran and A. G. W. Cameron (1967)
Science 157, 1517-1524
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