Distribution and Variability of Cosmic X-Ray Sources
Abstract
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 × 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.
- Publication:
-
Science
- Pub Date:
- April 1967
- DOI:
- 10.1126/science.156.3773.374
- Bibcode:
- 1967Sci...156..374F