Does dark matter protect cluster dwarf galaxies from disruption?

暗物质能否保护星团矮星系免受破坏？

• 批准号: 191797926
• 负责人: Privatdozent Dr. Thorsten Lisker
• 金额: --
• 依托单位: Astronomisches Rechen-Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/191797926?language=en
• 关键词: Does; dark; matter; protect; cluster

High ratios of dark to luminous mass appear to be typical for dwarf spheroidal galaxies, not only as Milky Way satellites: Recently it was shown that these faint, diffuse galaxies would be disrupted in the Perseus cluster center if they did not contain a major amount of dark matter. However, in both environments the argumentation hinges on a critical assumption: the galaxies need to be in an equilibrium state. If they are instead in the process of disruption, no significant dark matter content could be inferred, making the dwarfs a crucial test for our understanding of galaxy formation in the cosmological context. Deep imaging will reveal tidal tails and signs of disruption around these galaxies – or provide a strong confirmation on the presence of unseen mass and therefore of CDM in general.

暗质量与亮质量的高比率似乎是矮球状星系的典型特征，而不仅仅是银河系的卫星：最近的研究表明，如果这些暗淡的弥散星系不包含大量的暗物质，它们将在英仙座星系团中心被破坏。然而，在这两种环境中，论证都取决于一个关键的假设：星系需要处于平衡状态。如果它们处于分裂过程中，则无法推断出显着的暗物质含量，这使得矮星成为我们在宇宙学背景下理解星系形成的关键测试。深度成像将揭示这些星系周围的潮汐尾和分裂迹象-或者提供一个强有力的确认存在看不见的质量，因此一般的CDM。