Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..669d&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
We have observed the cluster of galaxies Abell 85 with XMM-Newton and determined new temperature and metal abundance maps for the main part of the cluster. These maps show the existence of various hot regions which often - but not always - have metal abundances lower than the average value, and suggest that Abell 85 has had an active life and is in the process of cannibalising smaller galaxy groups. The radial temperature profile shows a clear rapid decrease towards the centre and a slower decrease towards the exterior. Taking this profile into account we determined new dynamical mass and baryon fraction profiles. Finally, for a number of selected regions we have estimated individual metal abundances and compared the observed ratio of alpha-elements and Ni with respect to iron to the theoretical ratios derived from supernova yields. We conclude that the enrichment of the intra-cluster medium cannot be explained either by an early burst of SN II or by a continuous enrichment by SN Ia, but that both kinds of supernovae must have contributed metals to the ICM.
Bierrenbach Lima Neto Gastão
Durret Florence
Forman William
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