The temperature structure in the central region
CEA/DSM/DAPNIA Saclay, Service d'Astrophysique, L'Orme des Merisiers, Bât. 709, 91191 Gif-sur-Yvette, France
2 IAS-CNRS, Université Paris Sud, Bât. 121, 91405 Orsay Cedex, France
3 CEA/DSM/DAPNIA Saclay, Service d'Électronique et d'Informatique, 91191 Gif-sur-Yvette, France
4 Space Science Dept., European Space Agency, ESTEC Postbus 299, 2200 AG Noordwijk, The Netherlands
5 Max-Planck-Institut für extraterrestrische Physik, 85740 Garching, Germany
6 - Science Operations Centre, ESA Space Science Department, PO Box 50727, 28080 Madrid, Spain
7 IFC/CNR, Via Bassini 15, 20133 Milano, Italy
8 Department of Space and Climate Physics, UCL, Mullard Space Science Laboratory, Holmbury St. Mary, Surrey, UK
9 University of California, Santa Barbara, CA 93110, USA
10 NIS-2, MS D436, Los Alamos National Laboratory Los Alamos, NM 87545, USA
Corresponding author: M. Arnaud, firstname.lastname@example.org
Accepted: 2 November 2000
We present a temperature map and a temperature profile of the central part ( 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 . The temperature distribution around the two central galaxies is remarkably homogeneous (), 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 NGC 4839, probably due to an adiabatic compression.
Key words: galaxies: intergalactic medium / Cosmology: observations / Cosmology: dark matter / Cosmology: large-scale structure of the Universe / X-rays: general
Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).
EPIC was developed by the EPIC Consortium led by the Principal Investigator, Dr. M. J. L. Turner. The consortium comprises the following Institutes: University of Leicester, University of Birmingham, (UK); CEA/Saclay, IAS Orsay, CESR Toulouse, (France); IAAP Tuebingen, MPE Garching, (Germany); IFC Milan, ITESRE Bologna, IAUP Palermo, Italy. EPIC is funded by: PPARC, CEA, CNES, DLR and ASI.
© ESO, 2001