期刊
NATURE ASTRONOMY
卷 3, 期 6, 页码 524-534出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41550-019-0723-1
关键词
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资金
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- FIRST programme 'Subaru Measurements of Images and Redshifts (SuMIRe)', CSTP, Japan
- JSPS Promotion of Science [23340061, 26610058, 15H03654]
- MEXT [15H05887, 15H05892, 15H05893, 15K21733]
- JSPS Program for Advancing Strategic International Networks to Accelerate the Circulation of Talented Researchers
- FIRST programme from Japanese Cabinet Office
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- Japan Science and Technology Agency (JST)
- Toray Science Foundation
- NAOJ
- Kavli IPMU
- KEK
- ASIAA
- Princeton University
- National Aeronautics and Space Administration under Planetary Science Division of the NASA Science Mission Directorate [NNX08AR22G]
- National Science Foundation [AST-1238877]
- Grants-in-Aid for Scientific Research [15H05892] Funding Source: KAKEN
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 M-PBH = [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 range M-PBH similar or equal to [10(-11), 10(-6)] solar masses.
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