A Search for Wandering Black Holes in the Milky Way with Gaia and DECaLS
A Search for Wandering Black Holes in the Milky Way with Gaia and DECaLS
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DOI：
10.3847/1538-4357/ac0896
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
J. Greene;Lachlan Lancaster;Y. Ting;Sergey E. Koposov;S. Danieli;Song Huang;F. Jiang;J. Greco
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文献类型：
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作者：
J. Greene;Lachlan Lancaster;Y. Ting;Sergey E. Koposov;S. Danieli;Song Huang;F. Jiang;J. Greco
我们提出了一个搜索“超紧凑”的星星集群在银河系中使用盖亚和暗能量相机遗产调查（DECaLS）的组合。这样的星系团，大小约为1000 pc，包含500-5000颗恒星，预计仍将与中等质量黑洞（M BH <$103 -105 M <$）结合，这些黑洞可能会被吸积到银河系的矮卫星晕中。使用半解析模型SatGen，我们发现一个预期的1000个游荡的中等质量黑洞，如果每个坠落的卫星主机的黑洞。我们在搜索中没有发现任何这样的集群。我们的上限排除了100%的占用率，但并没有对占用率施加严格的限制。当然，我们需要对假定的星星团的属性进行更强的约束，包括它们的假设大小和致密残余恒星的比例。
We present a search for “hypercompact” star clusters in the Milky Way using a combination of Gaia and the Dark Energy Camera Legacy Survey (DECaLS). Such putative clusters, with sizes of ∼1 pc and containing 500–5000 stars, are expected to remain bound to intermediate-mass black holes (M BH ≈ 103–105 M ⊙) that may be accreted into the Milky Way halo within dwarf satellites. Using the semianalytic model SatGen, we find an expected ∼100 wandering intermediate-mass black holes if every infalling satellite hosts a black hole. We do not find any such clusters in our search. Our upper limits rule out 100% occupancy but do not put stringent constraints on the occupation fraction. Of course, we need stronger constraints on the properties of the putative star clusters, including their assumed sizes and the fraction of stars that would be compact remnants.