The Cluster Abell 85 and its X-ray Filament Revisited by Chandra and XMM-Newton
We have observed with XMM-Newton the extended 4 Mpc filament detected by the ROSAT PSPC south east of the cluster of galaxies Abell 85. We confirm the presence of an extended feature and find that the X-ray emission from the filament is best described by thermal emission with a temperature of ~ 2 keV. This 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 or a chain of several groups of galaxies.
KeywordsDiffuse Emission Photoelectric Absorption Galaxy Distribution Hydrogen Column Density Azimuthal Average
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- Durret F, Lima Neto G.B., Forman W., Churazov E. 2003, A&A Letters in press, astroph/0303486Google Scholar