The dark matter halo masses of galaxies can be estimated from their stellar masses via abundance matching (AM). For both the Milky Way and M31, the AM mass is higher than the mass inferred from kinematics. The higher AM masses exacerbate the missing satellite problem. The difference is especially pronounced for M31, for which but . This is more than expected from scatter in the AM relation, and may suggest the need for separate AM relations for early and late type galaxies.

中文翻译：

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来自丰度匹配和运动学的暗物质晕质量：银河系和 M31 的张力

星系的暗物质晕质量可以通过丰度匹配（AM）从它们的恒星质量来估计。对于银河系和 M31，AM 质量高于从运动学推断的质量。较高的 AM 质量会加剧丢失卫星的问题。M31 的差异尤其明显，但. 这超出了 AM 关系中分散的预期，并且可能表明早期和晚期类型星系需要单独的 AM 关系。