paper

X-ray analysis of the galaxy group UGC03957 beyond R200 with Suzaku

arXiv:1603.05255 · doi:10.1051/0004-6361/201527608

Abstract

We investigated the gas properties of the galaxy group UGC03957 up to Mpc in four azimuthal directions with the Suzaku satellit and performed a spectral analysis of five Suzaku observations of UGC03957 with 138ks good exposure time in total and five Chandra snapshot observations for point source detection. We found a temperature drop of a factor of from the center to the outskirts that is consistent with previous results for galaxy clusters. The metal abundance profile shows a flat behavior towards large radii, which is a hint for galactic winds as the primary ICM enrichment process. The entropy profile is consistent with numerical simulations after applying a gas mass fraction correction. Previous analyses for clusters and groups often showed an entropy flattening or even a drop around , which can be an indication of clumping or non-equilibrium states in the outskirts. Such entropy behavior is absent in UGC03957. The gas mass fraction is well below the cosmic mean but rises above this value beyond , which could be a hint for deviations from hydrostatic equilibrium at these large radii. We determined the relative number of different supernovae types and found that the abundance pattern can be described by a relative contribution of 80% - 100% of core-collapse supernovae. This result is in agreement with previous measurements for galaxy groups.

15 pages, 13 figures, accepted by A&A

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