The connection between the cusp-to-core transformation and observation al universalities of DM haloes
The connection between the cusp-to-core transformation and observation al universalities of DM haloes
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DM晕的尖点到核心的转变与观测普遍性之间的联系
DOI：
10.1093/mnrasl/slu023
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Andreas Burkert
中科院分区：
文献类型：
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作者：
Go Ogiya;Masao Mori;Tomoaki Ishiyama;Andreas Burkert
观测揭示了暗物质(DM)晕的有趣的普遍性质，特别是在低质量星系周围。Strigari等人。结果表明，在300nC范围内，DM晕具有共同的封闭质量(Strigari关系)。Kormendy&Freeman报道了DM光晕具有几乎相同的中心表面密度(μ0D关系)。此外，还存在核心-尖点问题，即模拟晕和观测值之间的中心密度分布不一致。我们研究了尖顶晕通过某些动力学过程转变为核心的情景是否也能解释它们的普遍结构性质。结果表明，点到核的变换模型自然地再现了矮小星系的μ0D关系，而μ0D关系是从Strigari 0D关系而来的。我们还表明，核心暗晕的中心密度提供了关于它们形成红移的有价值的信息。
Observations have revealed interesting universal properties of dark matter (DM) haloes especially around low-mass galaxies. Strigari et al. showed that DM haloes have common enclosed masses within 300 pc (Strigari relation). Kormendy & Freeman reported DM haloes having almost identical central surface densities (the μ0Drelation). In addition, there exists a core–cusp problem, a discrepancy of the central density distribution between simulated haloes and observations. We investigate whether a scenario where cuspy haloes transform into cores by some dynamical processes can also explain their universal structural properties. It is shown that a cusp-to-core transformation model naturally reproduces the μ0Drelation and that Strigari relation follows from the μ0Drelation for dwarf galaxies. We also show that the central densities of cored dark haloes provide valuable information about their formation redshifts.