Microlensing constraints on primordial black holes with Subaru/HSC Andromeda observations
Microlensing constraints on primordial black holes with Subaru/HSC Andromeda observations
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DOI：
10.1038/s41550-019-0723-1
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发表时间：
2019-04
期刊：
影响因子：
14.1
通讯作者：
Hiroko Niikura;M. Takada;N. Yasuda;R. Lupton;T. Sumi;S. More;Toshiki Kurita;Sunao Sugiyama;A. More;M. Oguri;M. Chiba
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作者：
Hiroko Niikura;M. Takada;N. Yasuda;R. Lupton;T. Sumi;S. More;Toshiki Kurita;Sunao Sugiyama;A. More;M. Oguri;M. Chiba
原始黑洞（PBH）长期以来一直被认为是难以捉摸的暗物质的可行候选者。这类PBH的丰度已经被许多天体物理学观测所限制，除了迄今尚未探索的MPBH = [10−14，10−9]太阳质量的质量窗口。在这里，我们进行了密集的节奏，7小时长的观测M31与斯巴鲁Hyper Suprime-Cam（HSC），寻找微透镜的恒星在M31的PBH位于银河系和M31的晕区。考虑到我们同时监测M31中的数千万颗恒星，如果这些亮的PBH构成了暗物质的很大一部分，我们预计会发现许多微透镜事件。然而，我们只确定了一个候选事件，这意味着在质量范围MPBH <$[10−11，10−6]太阳质量内PBH丰度的严格上限。
Primordial black holes (PBHs) have long been suggested as a viable candidate for the elusive dark matter. The abundance of such PBHs has been constrained using a number of astrophysical observations, except for a hitherto unexplored mass window ofMPBH= [10−14, 10−9] solar masses. Here we carry out a dense-cadence, 7-hour-long observation of M31 with the Subaru Hyper Suprime-Cam (HSC) to search for microlensing of stars in M31 by PBHs lying in the halo regions of the Milky Way and M31. Given our simultaneous monitoring of tens of millions of stars in M31, if such light PBHs make up a significant fraction of dark matter, we expect to find many microlensing events. However, we identify only a single candidate event, which translates into stringent upper bounds on the abundance of PBHs in the mass rangeMPBH≃ [10−11, 10−6] solar masses.