Microlensing constraints on primordial black holes with the Subaru/HSC Andromeda observation

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

Microlensing constraints on primordial black holes with the Subaru/HSC Andromeda observation

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

SCI - Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Primordial black holes (PBHs) have long been suggested as a viable candidate for the elusive dark matter (DM). 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]M_⊙. Here we carry out a dense-cadence (2 min sampling rate), 7 hour-long observation of the Andromeda galaxy (M31) with the Subaru Hyper Suprime-Cam to search for microlensing of stars in M31 by PBHs lying in the halo regions of the Milky Way (MW) and M31. Given our simultaneous monitoring of more than tens of millions of stars in M31, if such light PBHs make up a significant fraction of DM, we expect to find many microlensing events for the PBH DM scenario. However, we identify only a single candidate event, which translates into the most stringent upper bounds on the abundance of PBHs in the mass range M_PBH≃ [10^-11, 10^-6]M_⊙.

Original language	English
Journal	Unknown Journal
Publication status	Published - 2017 Jan 9

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Microlensing constraints on primordial black holes with the Subaru/HSC Andromeda observation. / Niikura, Hiroko; Takada, Masahiro; Yasuda, Naoki; Lupton, Robert H.; Sumi, Takahiro; More, Surhud; Kurita, Toshiki; Sugiyama, Sunao; More, Anupreeta; Oguri, Masamune; Chiba, Masashi.

In: Unknown Journal, 09.01.2017.

Research output: Contribution to journal › Article › peer-review

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

abstract = "Primordial black holes (PBHs) have long been suggested as a viable candidate for the elusive dark matter (DM). 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]M⊙. Here we carry out a dense-cadence (2 min sampling rate), 7 hour-long observation of the Andromeda galaxy (M31) with the Subaru Hyper Suprime-Cam to search for microlensing of stars in M31 by PBHs lying in the halo regions of the Milky Way (MW) and M31. Given our simultaneous monitoring of more than tens of millions of stars in M31, if such light PBHs make up a significant fraction of DM, we expect to find many microlensing events for the PBH DM scenario. However, we identify only a single candidate event, which translates into the most stringent upper bounds on the abundance of PBHs in the mass range MPBH≃ [10-11, 10-6]M⊙.",

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",

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T1 - Microlensing constraints on primordial black holes with the Subaru/HSC Andromeda observation

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 - 2017/1/9

Y1 - 2017/1/9

N2 - Primordial black holes (PBHs) have long been suggested as a viable candidate for the elusive dark matter (DM). 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]M⊙. Here we carry out a dense-cadence (2 min sampling rate), 7 hour-long observation of the Andromeda galaxy (M31) with the Subaru Hyper Suprime-Cam to search for microlensing of stars in M31 by PBHs lying in the halo regions of the Milky Way (MW) and M31. Given our simultaneous monitoring of more than tens of millions of stars in M31, if such light PBHs make up a significant fraction of DM, we expect to find many microlensing events for the PBH DM scenario. However, we identify only a single candidate event, which translates into the most stringent upper bounds on the abundance of PBHs in the mass range MPBH≃ [10-11, 10-6]M⊙.

AB - Primordial black holes (PBHs) have long been suggested as a viable candidate for the elusive dark matter (DM). 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]M⊙. Here we carry out a dense-cadence (2 min sampling rate), 7 hour-long observation of the Andromeda galaxy (M31) with the Subaru Hyper Suprime-Cam to search for microlensing of stars in M31 by PBHs lying in the halo regions of the Milky Way (MW) and M31. Given our simultaneous monitoring of more than tens of millions of stars in M31, if such light PBHs make up a significant fraction of DM, we expect to find many microlensing events for the PBH DM scenario. However, we identify only a single candidate event, which translates into the most stringent upper bounds on the abundance of PBHs in the mass range MPBH≃ [10-11, 10-6]M⊙.

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