Achievements & Publications

Hunting a Wandering Supermassive Black Hole in the M31 Halo Hermitage

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Miki, Yohei,   Mori, Masao,   Kawaguchi, Toshihiro,   Saito, Yuriko

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 10$^-3$ times the mass of its spheroidal component. Consequently, SMBHs are expected to...

First Systematic Search for Oxygen-line Blobs at High Redshift: Uncovering AGN Feedback and Star Formation Quenching

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Yuma, Suraphong,   Ouchi, Masami,   Drake, Alyssa B.,   Simpson, Chris,   Shimasaku, Kazuhiro,   Nakajima, Kimihiko

We present the first systematic search for extended metal-line [O II] \ensuremathłambda\ensuremathłambda3726, 3729 nebulae, or [O II] blobs (O IIBs), at z = 1.2 using deep narrowband imaging with a survey volume of 1.9 × 10$^5$ Mpc$^3$ on the 0.62 deg$^2$ sky of Subaru-XMM Deep Survey (SXDS) field. We discover...

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

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Miki, Yohei,   Takahashi, Daisuke,   Mori, Masao

We have developed a highly optimized code for collisionless N-body calculations based on direct summation. Our new optimization hides the global memory access latency, and the resulting CUDA code has a peak performance of 1006.7 GFlop/s in single precision (assuming 26 floating-point operations per interaction) with a single NVIDIA Tesla...

Transonic solutions of isothermal galactic winds in a cold dark matter halo

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Tsuchiya, Masami,   Mori, Masao,   Nitta, Shin-ya

We study fundamental properties of steady, spherically symmetric, isothermal galactic outflows in appropriate gravitational potential models. We aim at constructing a universal scale-free theory not only for galactic winds, but also for winds from clusters/groups of galaxies. In particular, we consider effects of mass-density distribution on the formation of transonic...

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Hunting a Wandering Supermassive Black Hole in the M31 Halo Hermitage

Miki, Yohei,   Mori, Masao,   Kawaguchi, Toshihiro,   Saito, Yuriko

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 10$^-3$ times the mass of its spheroidal component. Consequently, SMBHs are expected to...

March 2014   The Astrophysical Journal
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First Systematic Search for Oxygen-line Blobs at High Redshift: Uncovering AGN Feedback and Star Formation Quenching

Yuma, Suraphong,   Ouchi, Masami,   Drake, Alyssa B.,   Simpson, Chris,   Shimasaku, Kazuhiro,   Nakajima, Kimihiko

We present the first systematic search for extended metal-line [O II] \ensuremathłambda\ensuremathłambda3726, 3729 nebulae, or [O II] blobs (O IIBs), at z = 1.2 using deep narrowband imaging with a survey volume of 1.9 × 10$^5$ Mpc$^3$ on the 0.62 deg$^2$ sky of Subaru-XMM Deep Survey (SXDS) field. We discover...

December 2013   The Astrophysical Journal
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Highly scalable implementation of an N-body code on a GPU cluster

Miki, Yohei,   Takahashi, Daisuke,   Mori, Masao

We have developed a highly optimized code for collisionless N-body calculations based on direct summation. Our new optimization hides the global memory access latency, and the resulting CUDA code has a peak performance of 1006.7 GFlop/s in single precision (assuming 26 floating-point operations per interaction) with a single NVIDIA Tesla...

September 2013  
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Transonic solutions of isothermal galactic winds in a cold dark matter halo

Tsuchiya, Masami,   Mori, Masao,   Nitta, Shin-ya

We study fundamental properties of steady, spherically symmetric, isothermal galactic outflows in appropriate gravitational potential models. We aim at constructing a universal scale-free theory not only for galactic winds, but also for winds from clusters/groups of galaxies. In particular, we consider effects of mass-density distribution on the formation of transonic...

July 2013   Monthly Notices of the Royal Astronomical Society