An observer's guide to the (Local Group) dwarf galaxies: predictions for their own dwarf satellite populations
An observer's guide to the (Local Group) dwarf galaxies: predictions for their own dwarf satellite populations
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（本地群）矮星系观察者指南：对其自身矮卫星群的预测
DOI：
10.1093/mnras/stx1900
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发表时间：
2016
影响因子：
4.8
通讯作者：
A. Frebel
中科院分区：
文献类型：
--
作者：
Gregory A. Dooley;A. Peter;Tianyi Yang;B. Willman;Brendan Griffen;A. Frebel
最近在银河系新的超微弱矮卫星的发现激增，激发了寻找微弱卫星的想法，$10^3\，\mathrm{M_{\odot}}$99\%$的机会，至少有一个卫星的恒星质量$M_*> 10^5\，\mathrm{M_{\odot}}$存在于合并的五个本星系群场矮星系周围，具有最大的恒星质量。当考虑$M_*> 10^4\，\mathrm{M_{\odot}}$的卫星时，我们预测5个最大的场矮星的组合卫星数为5 -25$，整个本星系群场矮星的组合卫星数为10 -50$。由于预测的矮星数量相对较少，而且它们的空间分布范围很广，因此需要对每个本星系群矮星的维里体积进行测量，以确保发现。我们计算的卫星在特定的本星系群星系的一个给定的视野中的预测数量，作为最小卫星光度的函数，并明确获得这样的值为孤立的本地矮星调查。丰度匹配和再电离模型中的Understanding很大，这意味着全面的搜索可能会导致这两个模型的改进。
A recent surge in the discovery of new ultrafaint dwarf satellites of the Milky Way has inspired the idea of searching for faint satellites, $10^3\, \mathrm{M_{\odot}} 99\%$ chance that at least one satellite with stellar mass $M_*> 10^5\, \mathrm{M_{\odot}}$ exists around the combined five Local Group field dwarf galaxies with the largest stellar mass. When considering satellites with $M_*> 10^4\, \mathrm{M_{\odot}}$, we predict a combined $5-25$ satellites for the five largest field dwarfs, and $10-50$ for the whole Local Group field dwarf population. Because of the relatively small number of predicted dwarfs, and their extended spatial distribution, a large fraction each Local Group dwarf's virial volume will need to be surveyed to guarantee discoveries. We compute the predicted number of satellites in a given field of view of specific Local Group galaxies, as a function of minimum satellite luminosity, and explicitly obtain such values for the Solitary Local dwarfs survey. Uncertainties in abundance matching and reionization models are large, implying that comprehensive searches could lead to refinements of both models.
DOI：
10.1088/2041-8205/712/1/l103
发表时间：
2010-02
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
V. Belokurov;M. Walker;N. Evans;G. Gilmore;M. Irwin;D. Just;Sergey E. Koposov;M. Mateo;E. Olszewski;L. Watkins;L. W. IoA;Cambridge;S. Observatory;Tucson;U. Michigan
通讯作者：
V. Belokurov;M. Walker;N. Evans;G. Gilmore;M. Irwin;D. Just;Sergey E. Koposov;M. Mateo;E. Olszewski;L. Watkins;L. W. IoA;Cambridge;S. Observatory;Tucson;U. Michigan