Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-21
Astron.Astrophys.403:L29-L32,2003
Astronomy and Astrophysics
Astrophysics
accepted for publication in Astronomy & Astrophysics Letters
Scientific paper
10.1051/0004-6361:20030424
We have observed with XMM-Newton the extended 4 Mpc filament detected by the ROSAT PSPC in the neighbourhood of the cluster of galaxies Abell 85. We confirm that there is an extended feature, aligned at the same position angle as the major axis of the central cD, the bright cluster galaxies, and nearby groups and clusters. We find that the X-ray emission from the filament is best described by thermal emission with a temperature of about 2 keV, which is significantly lower than the ambient cluster medium, but is significantly higher than anticipated for a gas in a weakly bound extended filament. It is not clear whether this is a filament of diffuse emission, a chain of several groups of galaxies, or stripped gas from the infalling south blob.
Bierrenbach Lima Neto Gastão
Churazov Eugene
Durret Florence
Forman William
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