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High resolution observations of cluster of galaxies by Chandra have revealedthe existence of an X-ray emitting comet-like galaxy C153 in the core ofcluster of galaxies A2125. The galaxy C153 moving fast in the cluster core hasa 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 emittingplasma in the tail is substantially cooler than the ambient plasma. We presentresults of two-dimensional magnetohydrodynamic simulations of the timeevolution of a subclump like C153 moving in magnetized intergalactic matter.Anisotropic heat conduction is included. We found that the magnetic fields areessential for the existence of the cool X-ray tail, because in non-magnetizedplasma the cooler subclump tail is heated up by isotropic heat conduction fromthe hot ambient plasma and does not form such a comet-like tail.

MHD SIMULATIONS OF A MOVING SUB CLUMP WITH HEAT CONDUCTION