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Microlensing constraints on primordial black holes with Subaru/HSC Andromeda observations
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,…
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The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of the 8.2m Subaru telescope on the summit of Maunakea. A team of scientists from Japan, Taiwan and Princeton University is…
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Constraints on Earth-mass primordial black holes from OGLE 5-year microlensing events
We constrain the abundance of primordial black holes (PBH) using 2622 microlensing events obtained from 5-years observations of stars in the Galactic bulge by the Optical Gravitational Lensing…
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First data release of the Hyper Suprime-Cam Subaru Strategic Program
This paper presents the second data release of the Hyper Suprime-Cam Subaru Strategic Program, a wide-field optical imaging survey on the 8.2 meter Subaru Telescope. The release includes data from…
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Detection of universality of dark matter profile from Subaru weak lensing measurements of 50 massive clusters
We develop a novel method of measuring the lensing distortion profiles of clusters with stacking the scaled amplitudes of background galaxy ellipticities as a function of the scaled centric radius…
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Microlensing constraints on $10^{-10}M_\odot$-scale primordial black holes from high-cadence observation of M31 with Hyper Suprime-Cam
We use the Subaru Hyper Suprime-Cam (HSC) to conduct a high-cadence (2~min sampling) 7~hour long observation of the Andromeda galaxy (M31) to search for the microlensing magnification of stars in M31…
Earth-mass black holes? - Constraints on primordial black holes with 5-years OGLE microlensing events
We constrain the abundance of primordial black holes (PBH) using 2622 microlensing events obtained from 5-years observations of stars in the Galactic bulge by the Optical Gravitational Lensing…
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Modifications to the Etherington Distance Duality Relation and Observational Limits
The Etherington distance duality relation, which relates the luminosity distance, the angular diameter distance and the redshift of objects, depends only upon a conservation law for light that traces…
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