Dark-matter-deficient galaxies in hydrodynamical simulations

Dark-matter-deficient galaxies in hydrodynamical simulations
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流体动力学模拟中缺乏暗物质的星系

DOI:
10.1093/mnras/stz1839
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发表时间:
2018-11
影响因子:
4.8
通讯作者:
Gao Liang
Gao Liang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Jing Yingjie;Wang Chunxiang;Li Ran;Liao Shihong;Wang Jie;Guo Qi;Gao Liang

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低质量星系被认为是暗物质主导的,即使在它们的中心区域。最近,两个观测报告了两个矮星系在一个群体环境中,其中心区域几乎没有暗物质。我们探索人口和暗物质缺乏星系(DMDG)的起源使用两个国家的最先进的流体动力学模拟,鹰和Illustris项目。对于M200 > 1013 M$\odot $的所有109 < M* < 1010 M$\odot$的卫星星系,我们发现EAGLE中约有2.6美元,Illustris中约有1.5美元是暗物质分数低于50美元的DMDG,cent}$在两倍于半恒星质量半径的范围内。我们表明,DMDG是高度潮汐中断星系,因为暗物质具有较高的结合能比恒星,质量损失的暗物质是更迅速的比恒星在DMDG潮汐相互作用。如果DMDG在观测中得到证实,那么它们将在当前的星系形成模型中得到应用。
Low-mass galaxies are expected to be dark-matter-dominated even within their central regions. Recently, two observations reported two dwarf galaxies in a group environment with very little dark matter in their central regions. We explore the population and origins of dark-matter-deficient galaxies (DMDGs) using two state-of-the-art hydrodynamical simulations, the EAGLE and Illustris projects. For all satellite galaxies with 109 < M* < 1010 M$\odot$ in groups with M200 > 1013 M$\odot$, we find that about $2.6\, {\rm per\, cent}$ of them in EAGLE, and $1.5\, {\rm per\, cent}$ in Illustris are DMDGs with dark matter fractions below $50\, {\rm per\, cent}$ inside two times the half-stellar-mass radius. We demonstrate that DMDGs are highly tidally disrupted galaxies, and that because dark matter has a higher binding energy than stars, mass loss of the dark matter is much more rapid than that of stars in DMDGs during tidal interactions. If DMDGs were confirmed in observations, they are expected in current galaxy formation models.
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