arXiv 1809.059382018-09-16astro-ph.GAgr-qchep-phhep-th

暗物质缺乏星系在Illustris平坦- $Λ$ CDM模型结构形成模拟中的作用

Dark matter deficient galaxies in the Illustris flat-$Λ$CDM model structure formation simulation

Hai Yu, Bharat Ratra, Fa-Yin Wang

备注：: submitted

摘要：

调查暗物质缺乏的星系（那些与暗物质质量恒星质量比$M_{\rm dm}/M_{\rm star}<1$）在平面$Λ$ CDM宇宙演化的结构形成的Illustris模拟，我们发现$M_{\rm star} \approx 2 \times 10^8\, M_\sun$星系的属性相似的归因于\citet{vanDokkumetal2018a}的超扩散星系NGC 1052-DF 2。Illustris模拟还包含了更多的发光暗物质缺乏星系。插图星系次晕476171是一个特别有趣的异常值，它是一个质量很大、非常紧凑的星系，具有$M_{\rm star} \approx 9 \times 10^{10}\, M_\sun$和$M_{\rm dm}/M_{\rm star} \approx 0.1$，半恒星质量半径为$\approx 2$ kpc。如果Illustris模拟和$Λ$ CDM模型是准确的，那么就有相当数量的缺乏暗物质的星系，包括大质量的发光致密星系。这将是有趣的观测发现这些星系，也更清楚地了解他们是如何形成的，因为他们可能提供新的见解和约束模型的结构形成和暗物质的性质。

英文摘要：

Surveying dark matter deficient galaxies (those with dark matter mass to stellar mass ratio $M_{\rm dm}/M_{\rm star}<1$) in the Illustris simulation of structure formation in the flat-$Λ$CDM cosmogony, we find $M_{\rm star} \approx 2 \times 10^8\, M_\sun$ galaxies that have properties similar to those ascribed by \citet{vanDokkumetal2018a} to the ultra-diffuse galaxy NGC1052-DF2. The Illustris simulation also contains more luminous dark matter deficient galaxies. Illustris galaxy subhalo 476171 is a particularly interesting outlier, a massive and very compact galaxy with $M_{\rm star} \approx 9 \times 10^{10}\, M_\sun$ and $M_{\rm dm}/M_{\rm star} \approx 0.1$ and a half-stellar-mass radius of $\approx 2$ kpc. If the Illustris simulation and the $Λ$CDM model are accurate, there are a significant number of dark matter deficient galaxies, including massive luminous compact ones. It will be interesting to observationally discover these galaxies, and to also more clearly understand how they formed, as they are likely to provide new insight into and constraints on models of structure formation and the nature of dark matter.

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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