X-Ray Observations of Clusters of Galaxies
Abstract
The situation regarding identifications of clusters of galaxies with X-ray sources is reviewed, and the luminosity function and possibly relationships between a number of cluster X-ray and optical properties are discussed for clusters listed in the second Ariel catalog. Recent X-ray observations of superclusters are also recounted along with cluster structural measurements by means of rocket observations with imaging X-ray telescopes. The present status of iron-line observations at 6.7 keV is described, and estimates of the iron abundance that result from the iron-line data are examined. The contributions of clusters and of X-ray emitting Seyfert galaxies to the diffuse X-ray background are set at 14% and 6%, respectively, for the energy range from 2 to 10 keV. The X-ray structures of the Perseus, Virgo, Centaurus, and Abell 478 clusters are briefly described. It is noted that 30 to 40 clusters are known to be X-ray sources and that essentially all clusters of galaxies will probably be X-ray sources.
- Publication:
-
Large Scale Structures in the Universe
- Pub Date:
- 1978
- Bibcode:
- 1978IAUS...79..165C
- Keywords:
-
- Galactic Clusters;
- X Ray Astronomy;
- X Ray Sources;
- Astronomical Catalogs;
- Luminous Intensity;
- Rocket-Borne Instruments;
- Seyfert Galaxies;
- X Ray Spectra;
- X Ray Telescopes;
- Astrophysics