XMM- Newton Observation of the Coma Galaxy Cluster: The temperature structure in the central region

Details XMM- Newton Observation of the Coma Galaxy Cluster: The temperature structure in the central region XMM- Newton Observation of the Coma Galaxy Cluster: The temperature structure in the central region

2000-11-03

arxiv.org/abs/astro-ph/0011086v1

Astronomy and Astrophysics

Astrophysics

7 pages, 8 figures, Accepted for publication in A&A (special Letter issue on XMM)

Scientific paper

10.1051/0004-6361:20000195

We present a temperature map and a temperature profile of the central part (r < 20' or 1/4 virial radius) of the Coma cluster. We combined 5 overlapping pointings made with XMM/EPIC/MOS and extracted spectra in boxes of 3.5' X 3.5'. The temperature distribution around the two central galaxies is remarkably homogeneous (r<10'), contrary to previous ASCA results, suggesting that the core is actually in a relaxed state. At larger distance from the cluster center we do see evidence for recent matter accretion. We confirm the cool area in the direction of NGC 4921, probably due to gas stripped from an infalling group. We find indications of a hot front in the South West, in the direction of NGC4839, probably due to an adiabatic compression.

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