Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..705b&link_type=abstract
SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli
Astronomy and Astrophysics
Astrophysics
Scientific paper
Using a wavelet algorithm especially designed for that purpose, we have mapped, to the highest angular resolution allowed by the data, the temperature structure of the intra-cluster medium within eight bright and extended clusters of galaxies observed with XMM-Newton: A399, A401, A478, A1795, A2029, A2065, A2256, A2255. This set is an almost complete X-ray flux limited cluster sample, which includes merging and relaxed clusters. Being major mergers, we find that 5 out of 8 cluster show a rather complex thermal structure consistent with their merger dynamics. More surprisingly significant non-radial thermal structures are also observed outside the core region of two of the remaining ``relaxed" clusters. These findings question the validity limits of the elliptical symmetry hypothesis required for deriving cluster mass profiles from gas brightness and temperature profiles measurements.
Bourdin Herve
Mazzotta Pasquale
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