D-122 銀河団 X 線放射プラズマの磁気流体数値実験

概要

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Recent observations of cluster of galaxies by Chandra X-ray satellite revealed the existence of sharp discontinuity of X-ray intensity where temperature drops across the front. This front is called the cold front. We present the results of two-dimensional magnetohydrodynamic (MHD) simulations of the time evolution of a dense sub-cluster moving in cluster of galaxies. Anisotropic heat conduction along magnetic field lines is included. Numerical results indicate that in hydrodynamical models without magnetic fields, the cold dense plasma in the sub-cluster evaporates due to the heat conduction from the hot ambient plasma. When magnetic fields exist, however, we found that cold fronts can be maintained because heat conduction is suppressed across the magnetic field lines. Numerical results successfully reproduced the X-ray intensity distribution observed in A3667 cluster of galaxies.
2003-07-28