Microlensing constraints on primordial black holes with Subaru/HSC Andromeda observations

@article{Niikura2019MicrolensingCO,
  title={Microlensing constraints on primordial black holes with Subaru/HSC Andromeda observations},
  author={Hiroko Niikura and Masahiro Takada and Naoki Yasuda and Robert H. Lupton and Takahiro Sumi and Surhud More and Toshiki Kurita and Sunao Sugiyama and Anupreeta More and Masamune Oguri and Masashi Chiba},
  journal={Nature Astronomy},
  year={2019},
  volume={3},
  pages={524-534}
}
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 of MPBH = [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… 
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