The BEPPOSAX View of the Hot Cluster Abell 2319
Abstract
We present results from a BeppoSAX observation of the rich cluster Abell 2319. The broadband spectrum (2-50 keV) of the cluster can be adequately represented by an optically thin thermal emission model with a temperature of 9.6+/-0.3 keV and a metal abundance of 0.25+/-0.03 in solar units and with no evidence of a hard X-ray excess in the PDS spectrum. From the upper limit to the hard-tail component, we derive a lower limit of ~0.04 μG for the volume-averaged intracluster magnetic field. By performing spatially resolved spectroscopy in the medium energy band (2-10 keV), we find that the projected radial temperature and metal abundance profiles are constant out to a radius of 16' (1.4 Mpc). A reduction of the temperature of one-third, when going from the cluster core out to 16', can be excluded in the present data at the 99% confidence level. From the analysis of the temperature and abundance maps, we find evidence of a temperature enhancement and of an abundance decrement in a region localized 6'-8' northeast of the core, where a merger event may be taking place. Finally, the temperature map indicates that the subcluster located northwest of the main cluster may be somewhat cooler than the rest of the cluster.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1999
- DOI:
- 10.1086/312340
- arXiv:
- arXiv:astro-ph/9909228
- Bibcode:
- 1999ApJ...525L..73M
- Keywords:
-
- GALAXIES: CLUSTERS: INDIVIDUAL: ALPHANUMERIC: A2319;
- X-RAYS: GALAXIES;
- Galaxies: Clusters: Individual: Alphanumeric: A2319;
- X-Rays: Galaxies;
- Astrophysics
- E-Print:
- To appear in ApJ-Letters