Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-15
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures. To appear in a special issue of the Journal of the Korean Astronomical Society (JKAS). Proceedings of the
Scientific paper
High resolution observations of cluster of galaxies by Chandra have revealed the existence of an X-ray emitting comet-like galaxy C153 in the core of cluster of galaxies A2125. The galaxy C153 moving fast in the cluster core has a distinct X-ray tail on one side, obviously due to ram pressure stripping, since the galaxy C153 crossed the central region of A2125. The X-ray emitting plasma in the tail is substantially cooler than the ambient plasma. We present results of two-dimensional magnetohydrodynamic simulations of the time evolution of a subclump like C153 moving in magnetized intergalactic matter. Anisotropic heat conduction is included. We found that the magnetic fields are essential for the existence of the cool X-ray tail, because in non-magnetized plasma the cooler subclump tail is heated up by isotropic heat conduction from the hot ambient plasma and does not form such a comet-like tail.
Asai Naoki
Fukuda Naoya
Matsumoto Ryoji
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