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XMM-Newton Observation of IC 310 in the Outer Region of the Perseus Cluster of Galaxies

K. Sato·T. Furusho·N. Y. Yamasaki·M. Ishida·K. Matsushita·T. Ohashi
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Abstract

We present results from an XMM-Newton observation of the head-tail radio galaxy IC 310 located in the southwest region of the Perseus cluster. The spectrum is well-fitted by an absorbed power-law model with a photon index of $2.50 \pm 0.02$ with no significant absorption excess. The X-ray image shows a point-like emission at IC 310 without any signs of a structure correlated with the radio halo tail. The temperature of the intracluster medium surrounding IC 310 declines as a function of distance from the cluster center, from $ kT \sim 6$ keV in the northeast corner of the field of view to about 3 keV in the southwest region. Although we do not find any sharp edges in the surface brightness profile, a brightness excess over a smooth $β$ model by about 20% is seen. The temperature also rises by about 10% in the same region. This indicates that the IC 310 region is a subcluster probably infalling into the Perseus cluster, and the gas in front of IC 310 towards the Perseus cluster is likely to be compressed by the large-scale motion, which supports the view that the IC 310 system is undergoing a merger.

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K. Sato, T. Furusho, N. Y. Yamasaki, M. Ishida, K. Matsushita, T. Ohashi. 2005-09-22. XMM-Newton Observation of IC 310 in the Outer Region of the Perseus Cluster of Galaxies. https://doi.org/10.1093/pasj%2F57.5.743

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