1E 0657-56: A Contender for the Hottest Known Cluster of Galaxies
Abstract
We identify the extended Einstein IPC X-ray source 1E 0657-56 with a previously unknown cluster of galaxies at a redshift of z=0.296. Optical CCD images show the presence of a gravitational arc in this cluster, and galaxy spectra yield a cluster velocity dispersion of 1213+352-191 km s-1. X-ray data obtained with the ROSAT HRI and ASCA indicate that 1E 0657-56 is a highly luminous cluster in which a merger of subclusters may be occurring. The temperature of the hot gas in 1E 0657-56 is kT=17.4+/-2.5 keV, which makes it an unusually hot cluster, with important cosmological implications.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1998
- DOI:
- 10.1086/311234
- arXiv:
- arXiv:astro-ph/9801120
- Bibcode:
- 1998ApJ...496L...5T
- Keywords:
-
- GALAXIES: INTERGALACTIC MEDIUM;
- GALAXIES: CLUSTERS: INDIVIDUAL ALPHANUMERIC: 1E 0657-;
- 6;
- COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE;
- X-RAYS: GALAXIES;
- Galaxies: Clusters: Individual: Alphanumeric: 1E 0657-56;
- Galaxies: Intergalactic Medium;
- Cosmology: Large-Scale Structure of Universe;
- X-Rays: Galaxies;
- Astrophysics
- E-Print:
- 4 figures