Yohei Miki

Hunting a Wandering Supermassive Black Hole in the M31 Halo Hermitage

In the hierarchical structure formation scenario, galaxies enlarge through multiple merging events with less massive galaxies. In addition, the Magorrian relation indicates that almost all galaxies are occupied by a central supermassive black hole (SMBH) of mass

Formation of the Andromeda Giant Stream: Asymmetric Structure and Disc Progenitor

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Studying the core-cusp problem in cold dark matter halos using N-body simulations on GPU clusters

of its spheroidal component. Consequently, SMBHs are expected to wander in the halos of their host galaxies following a galaxy collision, although evidence of this activity is currently lacking. We investigate a current plausible location of an SMBH wandering in the halo of the Andromeda galaxy (M31). According to theoretical studies of

Off-Loading LET Generation to PEACH2: A Switching Hub for High Performance GPU Clusters

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RELICS OF GALAXY MERGING: OBSERVATIONAL PREDICTIONS FOR A WANDERING MASSIVE BLACK HOLE AND ACCOMPANYING STAR CLUSTER IN THE HALO OF M31

-body simulations, some of the many substructures in the M31 halo are remnants of a minor merger occurring about 1 Gyr ago. First, to evaluate the possible parameter space of the infalling orbit of the progenitor, we perform numerous parameter studies using a Graphics Processing Unit (GPU) cluster. To reduce uncertainties in the predicted position of the expected SMBH, we then calculate the time evolution of the SMBH in the progenitor dwarf galaxy from

Puzzling outer-density profile of the dark matter halo in the Andromeda galaxy

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COLLISION TOMOGRAPHY: PHYSICAL PROPERTIES OF POSSIBLE PROGENITORS OF THE ANDROMEDA STELLAR STREAM

-body simulations using the plausible parameter sets. Our results show that the SMBH lies within the halo (

Highly scalable implementation of an N-body code on a GPU cluster

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A Fast Implementation and Performance Analysis of Collisionless N-body Code Based on GPGPU

20--50 kpc from the M31 center), closer to the Milky Way than the M31 disk. Furthermore, the predicted current positions of the SMBH were restricted to an observational field of

Resolving the outer density profile of dark matter halo in Andromeda galaxy

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