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

Hiroko Niikura; Masahiro Takada; Naoki Yasuda; Robert H. Lupton; Takahiro Sumi; Surhud More; Toshiki Kurita; Sunao Sugiyama; Anupreeta More; Masamune Oguri; Masashi Chiba

doi:10.1038/s41550-019-0723-1

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

Hiroko Niikura, Masahiro Takada, Naoki Yasuda, Robert H. Lupton, Takahiro Sumi, Surhud More, Toshiki Kurita, Sunao Sugiyama, Anupreeta More, Masamune Oguri, Masashi Chiba

Astrophysical Sciences

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Abstract

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 ≃ [10⁻¹¹, 10⁻⁶] solar masses.

Original language	English (US)
Pages (from-to)	524-534
Number of pages	11
Journal	Nature Astronomy
Volume	3
Issue number	6
DOIs	https://doi.org/10.1038/s41550-019-0723-1
State	Published - Jun 1 2019

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics

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title = "Microlensing constraints on primordial black holes with Subaru/HSC Andromeda observations",

abstract = "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 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 MPBH ≃ [10−11, 10−6] solar masses.",

author = "Hiroko Niikura and Masahiro Takada and Naoki Yasuda and Lupton, {Robert H.} and Takahiro Sumi and Surhud More and Toshiki Kurita and Sunao Sugiyama and Anupreeta More and Masamune Oguri and Masashi Chiba",

note = "Publisher Copyright: {\textcopyright} 2019, The Author(s), under exclusive licence to Springer Nature Limited.",

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doi = "10.1038/s41550-019-0723-1",

language = "English (US)",

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AU - Niikura, Hiroko

AU - Takada, Masahiro

AU - Yasuda, Naoki

AU - Lupton, Robert H.

AU - Sumi, Takahiro

AU - More, Surhud

AU - Kurita, Toshiki

AU - Sugiyama, Sunao

AU - More, Anupreeta

AU - Oguri, Masamune

AU - Chiba, Masashi

PY - 2019/6/1

Y1 - 2019/6/1

N2 - 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 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 MPBH ≃ [10−11, 10−6] solar masses.

AB - 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 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 MPBH ≃ [10−11, 10−6] solar masses.

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

Abstract

All Science Journal Classification (ASJC) codes

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