Achievements & Publications

Multiple Supernova Explosions in a Forming Galaxy

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Mori, Masao,   Umemura, Masayuki,   Ferrara, Andrea

Ultra-high resolution hydrodynamic simulations using 1024$^3$ grid points are performed of a very large supernova burst in a forming galaxy, with properties similar to those inferred for Lyman Break Galaxies (LBGs). Explosions produce kpc-sized expanding hot bubbles enclosed by cool, dense shells, and the engulfed gas is polluted with freshly-synthesised...

Why Are Massive Black Holes Small in Disk Galaxies?

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Kawakatu, Nozomu,   Umemura, Masayuki

A potential mechanism is proposed to account for the fact that supermassive black holes (SMBHs) in disk galaxies appear to be smaller than those in elliptigalaxies in the same luminosity range. We consider the formation of SMBHs by radiation drag (the Poynting-Robertson effect), which extracts angular momentum from interstellar matter...

The Discovery of Two Lyman \ensuremathα Emitters beyond Redshift 6 in the Subaru Deep Field

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Kodaira, Keiichi,   Taniguchi, Yoshiaki,   Kashikawa, Nobunari,   Kaifu, Norio,   Ando, Hiroyasu,   Karoji, Hiroshi

We performed a deep optical imaging survey using a narrow-band filter (NB921) centered at \ensuremathłambda = 9196 ̊A together with i' and z'broadband filters covering an 814 arcmin$^2$area of the Subaru Deep Field. We obtained a sample of 73 strongNB921-excess objects based on the following two color criteria: z -...

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Multiple Supernova Explosions in a Forming Galaxy

Mori, Masao,   Umemura, Masayuki,   Ferrara, Andrea

Ultra-high resolution hydrodynamic simulations using 1024$^3$ grid points are performed of a very large supernova burst in a forming galaxy, with properties similar to those inferred for Lyman Break Galaxies (LBGs). Explosions produce kpc-sized expanding hot bubbles enclosed by cool, dense shells, and the engulfed gas is polluted with freshly-synthesised...

January 2004   Publications of the Astronomical Society of Australia
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Why Are Massive Black Holes Small in Disk Galaxies?

Kawakatu, Nozomu,   Umemura, Masayuki

A potential mechanism is proposed to account for the fact that supermassive black holes (SMBHs) in disk galaxies appear to be smaller than those in elliptigalaxies in the same luminosity range. We consider the formation of SMBHs by radiation drag (the Poynting-Robertson effect), which extracts angular momentum from interstellar matter...

January 2004   The Astrophysical Journal Letters
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The Discovery of Two Lyman \ensuremathα Emitters beyond Redshift 6 in the Subaru Deep Field

Kodaira, Keiichi,   Taniguchi, Yoshiaki,   Kashikawa, Nobunari,   Kaifu, Norio,   Ando, Hiroyasu,   Karoji, Hiroshi

We performed a deep optical imaging survey using a narrow-band filter (NB921) centered at \ensuremathłambda = 9196 ̊A together with i' and z'broadband filters covering an 814 arcmin$^2$area of the Subaru Deep Field. We obtained a sample of 73 strongNB921-excess objects based on the following two color criteria: z -...

April 2003   Publications of the Astronomical Society of Japan