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arXiv 0705.2556astro-ph
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冷暗物质宇宙学中的卫星生存

Satellite survival in cold dark matter cosmology

C. M. Boily, N. Nakastao, R. Spurzem, T. Tsuchiya

摘要:

我们研究了在较大的自引力暗物质晕中子结构(团块)的生存。从N-体计算的剧烈弛豫的标度关系的基础上,我们认为,潮汐场的星系和晕只能破坏子结构,如果球对称施加在形成。我们探索其他机制,可能会定制的晕子结构的数量在男性化的过程中。除非更大的晕是建立在几个大的团块,我们发现,丛丛遇到不太可能均匀的动态时间尺度上的晕。相混合在内部进行得更快,允许恒星盘的长期演化。

英文摘要:

We study the survival of substructures (clumps) within larger self-gravitating dark matter halos. Building on scaling relations obtained from N-body calculations of violent relaxation, we argue that the tidal field of galaxies and halos can only destroy substructures if spherical symmetry is imposed at formation. We explore other mechanisms that may tailor the number of halo substructures during the course of virialization. Unless the larger halo is built up from a few large clumps, we find that clump-clump encounters are unlikely to homogenize the halo on a dynamical timescale. Phase mixing would proceed faster in the inner parts and allow for the secular evolution of a stellar disk.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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