Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19916109h&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #161.09; Bulletin of the American Astronomical Society, Vol. 34, p.573
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an analysis of BeppoSAX observations of the galaxy clusters, Abell 1750 and IC1262. Abell 1750 is a merging double cluster with two distinct X-ray peaks. We report an overall cluster temperature of 4.1 - 4.7 keV, and the discovery of weak non-thermal emission, 3.0-6.0x10-4 erg cm-2 s-1 keV-1 at 1 keV, with a photon index (α x) between 0.9 and 1.6. The non-thermal emission is identified with the region between the two peaks. IC1262 is a cD dominated, X-ray bright, galaxy cluster with a single X-ray peak. We present the first temperature and abudance measurements of this cluster. Two models have been fit to this cluster: a two component Raymond-Smith model and a Raymond-Smith model with a powerlaw. The two component Raymond-Smith model provides a marginally better fit, and gives a high temperature of 2.2 - 3.1 keV, and a low temperature between 0.9 - 1.2 keV. The abundance is constrained between .31 and .65. The Raymond-Smith with powerlaw model gives a temperature of 1.7 - 2.2 keV, an abundance of .62 - 1.46, and a photon index (α x) of 1.8 - 2.9. We discuss the plausibility of the two models, and the possibility that the non-thermal emission could be produced in IC1262's intracluster medium, a feature that is usually associated with much larger, hotter clusters. We thank NSF Grant No. AST-9626716/9996269 for support.
Henriksen Mark J.
Hudson Daniel S.
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