Extragalactic X-ray sources.
Abstract
The X-ray and optical properties of extragalactic X-ray sources are discussed on the basis of a division of all the 3U X-ray sources into high- and low-galactic-latitude sources. Emphasis is on describing facts and recent observational data rather than on providing theoretical explanations. The correlations between the optical and X-ray properties of rich clusters of galaxies are revealed, and an upper limit is set to the number of distant rich clusters of galaxies that could be present among the so far unidentified high-latitude 3U sources. The identified extragalactic X-ray sources including galaxies, clusters of galaxies, and a QSO are examined. The possibility of using the sizes of clusters of galaxies in placing constraints on some cosmological models is considered.
- Publication:
-
Seventh Texas Symposium on Relativistic Astrophysics
- Pub Date:
- October 1975
- DOI:
- 10.1111/j.1749-6632.1975.tb31450.x
- Bibcode:
- 1975NYASA.262..361B
- Keywords:
-
- Galactic Clusters;
- Galactic Radiation;
- Optical Properties;
- X Ray Sources;
- Astronomical Models;
- Cosmology;
- Extragalactic Radio Sources;
- Light Emission;
- X Ray Astronomy;
- Astrophysics