乱流磁場中を運動する銀河団サブクラスターの3次元磁気流体数値実験(宇宙流体(3),一般講演)

概要

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Sharp temperature discontinuities in clusters of galaxies, called cold fronts, are striking objects which reveal thermal properties of the intracluster medium. They cannot survive unless magnetic fields suppress evaporation by thermal conduction. We carried out three-dimensional magnetohydrodynamic simulations of a subcluster moving in turbulent magnetic fields. Numerical results show that the cold front is maintained for at least 1 Gyr because the conduction across the front is suppressed by magnetic fields stretched along the front. We also found that a moving subcluster works as an amplifier of magnetic fields. Stretched turbulent magnetic fields accumulate behind the subcluster and are further amplified by vortex motions. The moving subcluster creates a long tail of ordered magnetic fields.
2007-08-06