Dissipative dark matter and the Andromeda plane of satellites
Dissipative dark matter and the Andromeda plane of satellites
复制标题
耗散暗物质和仙女座卫星平面
DOI：
10.1088/1475-7516/2015/09/057
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发表时间：
2014
影响因子：
6.4
通讯作者：
J. Scholtz
中科院分区：
文献类型：
--
作者：
L. Randall;J. Scholtz
我们表明，耗散暗物质可以潜在地解释在最近发现的仙女座周围平面结构中观察到的矮卫星星系的巨大质光比，这被认为是星系合并期间潮汐力的结果。虽然由普通盘形成的矮星系缺乏暗物质，但星系平面内的暗物质不仅提供了暗物质源，而且由于暗物质速度较低，暗物质更容易被束缚。这项最初的 N 体研究表明，重子盘内有一个薄薄的暗物质盘，当潮汐力拉出大小类似于暗盘托姆不稳定性尺度的斑块时，可以产生高达 ?(90) 的质光比。需要进行完整的模拟来确认这一结果。
We show that dissipative dark matter can potentially explain the large observed mass to light ratio of the dwarf satellite galaxies that have been observed in the recently identified planar structure around Andromeda, which are thought to result from tidal forces during a galaxy merger. Whereas dwarf galaxies created from ordinary disks would be dark matter poor, dark matter inside the galactic plane not only provides a source of dark matter, but one that is more readily bound due to the dark matter's lower velocity. This initial N-body study shows that with a thin disk of dark matter inside the baryonic disk, mass-to-light ratios as high as ?(90) can be generated when tidal forces pull out patches of sizes similar to the scales of Toomre instabilities of the dark disk. A full simulation will be needed to confirm this result.