Compact Sunyaev-Zeldovich `hole' in the Bullet Cluster

Details Compact Sunyaev-Zeldovich `hole' in the Bullet Cluster Compact Sunyaev-Zeldovich `hole' in the Bullet Cluster

2010-05-09

arxiv.org/abs/1005.1394v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 3 figures

Scientific paper

We present 18~GHz observations of the Bullet cluster from the Australia Telescope Compact Array; in particular, a high angular resolution measurement of the substructure in Sunyaev-Zel'dovich Effect (SZE). We report the discovery of a compact SZE `hole' in the galaxy cluster. The SZE hole does not correspond to any bright feature in X-ray, optical or lensing maps; in general, the relatively deeper SZE features appear to avoid the regions with the most intense X-ray emission. These imply that the gas pressure distribution differs significantly from the distributions in gas emission measure, galaxy and dark matter distributions. This has implications for the gas physics and evolution in the cluster merger event. SZE displaced from X-ray centres implies that modeling cluster dynamics is non-trivial; our observations indicate that our current lack of understanding cluster merger astrophysics may be a limitation to modeling the cosmological distribution in SZE cluster counts and the cluster SZE contribution to small-angle cosmic microwave background (CMB) anisotropy. The SZE distribution in the western parts of the cluster are cospatial with the radio halo indicative of a common origin for the hot and relativistic electrons in the turbulent wake of the Bullet.

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