A2163: an Exceptionally Hot Cluster of Galaxies
Abstract
We measured the X-ray spectrum of the distant galaxy cluster A2163 in the energy range 1-18 keV with the Ginga satellite. A combined analysis of these data with data previously obtained with the Einstein Observatory is presented. The mean temperature and X-ray luminosity we derive are exceptionally high compared to other clusters: kT = 12.9 keV, L_x_ (2-10 keV) = 3.5 x 10^45^ ergs s^-1^ for z = 0.15, as are the gas mass (6.7 x 10^14^M_sun_) and binding mass (25 x 10^14^M_sun_). The very existence of such a cluster can provide interesting constraints on the relative distribution of "visible" mass and dark matter, an important parameter in cold dark matter models for formation of structure in the universe.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 1992
- DOI:
- 10.1086/171285
- Bibcode:
- 1992ApJ...390..345A
- Keywords:
-
- Dark Matter;
- Galactic Clusters;
- Galactic Radiation;
- X Ray Sources;
- Heao 2;
- Satellite Observation;
- Spaceborne Astronomy;
- Spectrum Analysis;
- X Ray Spectra;
- Astrophysics;
- COSMOLOGY: DARK MATTER;
- GALAXIES: CLUSTERING;
- X-RAYS: GALAXIES