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WHERE IS THE DARK MATTER?

机译：黑暗的地方在哪里？

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How much dark matter is there in the universe and where is it located? These are two of the most fundamental questions in cosmology. We use in this paper optical and X-ray mass determinations of galaxies, groups, and clusters of galaxies to suggest that most of the dark matter may reside in very large halos around galaxies, typically extending to ～200 kpc for bright galaxies. We show that the mass-to-light ratio of galaxy systems does not increase significantly with linear scale beyond the very large halos suggested for individual galaxies. Rather, the total mass of large-scale systems such as groups and rich clusters of galaxies, even superclusters, can on average be accounted for by the total mass of their member galaxies, including their large halos (which may be stripped off in the dense cluster environment but still remain in the clusters) plus the mass of the hot intracluster gas. This conclusion also suggests that we may live in a low-density universe with Ω ～ 0.2-0.3.
机译：宇宙中有多少暗物质，它位于何处？这是宇宙学中两个最基本的问题。我们在本文中使用光学和X射线质量测定星系，星系和星系团，表明大多数暗物质可能存在于星系周围非常大的晕圈中，对于明亮的星系而言通常扩展到约200 kpc。我们表明，星系系统的质光比不会随线性尺度的增加而显着增加，超出单个星系建议的非常大的光环。相反，大型系统的总质量，例如星系的群和富星团，甚至超级集群，平均可以由其成员星系的总质量来解释，包括它们的大光环（在密集的星系中可能会剥落）集群环境，但仍保留在集群中）加上热集群内气体的质量。该结论还表明我们可能生活在Ω〜0.2-0.3的低密度宇宙中。

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