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arXiv 1909.07979astro-ph.GAgr-qchep-ph
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Milky-Way矮球状星系没有暗物质吗?

Are Milky-Way dwarf-spheroidal galaxies dark-matter free?

F. Hammer, Y. B. Yang, J. L. Wang, F. Arenou, C. Babusiaux, M. Puech, H. Flores

摘要:

我们发现,矮球状星系(dSphs)的高速色散可以很好地解释银河系(MW)的潮汐冲击,它精确地再现了以前归因于暗物质(DM)的引力加速度。在这里,我们总结了Hammer等人(2019)的主要结果,他们研究了dSphs的主要标度关系,并展示了偏离平衡的暗物质自由星系如何很好地再现它们,而它们似乎对DM模型具有挑战性。这些结果与我们最近对dSph过去历史的了解一致,包括它们的轨道,它们过去的恒星形成历史和它们的祖先,它们可能是微小的矮不规则星系。

英文摘要:

We have found that the high velocity dispersions of dwarf spheroidal galaxies (dSphs) can be well explained by Milky Way (MW) tidal shocks, which reproduce precisely the gravitational acceleration previously attributed to dark matter (DM). Here we summarize the main results of Hammer et al. (2019) who studied the main scaling relations of dSphs and show how dark-matter free galaxies in departure from equilibrium reproduce them well, while they appear to be challenging for the DM model. These results are consistent with our most recent knowledge about dSph past histories, including their orbits, their past star formation history and their progenitors, which are likely tiny dwarf irregular galaxies.

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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