研究成果・発表論文

Galaxy-scale AGN feedback - theory

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Wagner, A.~Y.,   Bicknell, G.~V.,   Umemura, M.,   Sutherland , R.~S.,   Silk, J.

Powerful relativistic jets in radio galaxies are capable of driving strong outflows but also inducing star-formation by pressure- triggering collapse of dense clouds. We review theoretical work on negative and positive active galactic nuclei feedback...

Radiation hydrodynamic simulations of line-driven disk winds for ultra-fast outflows

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Nomura, Mariko,   Ohsuga, Ken,   Takahashi, Hiroyuki R.,   Wada, Keiichi,   Yoshida, Tessei

Using two-dimensional radiation hydrodynamic simulations, we investigate the origin of the ultra-fast outflows (UFOs) that are often observed in luminous active galactic nuclei (AGNs). We found that the radiation force due to the spectral lines gener...

Spectral Line Survey toward Molecular Clouds in the Large Magellanic Cloud

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Nishimura, Yuri,   Shimonishi, Takashi,   Watanabe, Yoshimasa,   Sakai, Nami,   Aikawa, Yuri,   Kawamura, Akiko

Spectral line survey observations of seven molecular clouds in the Large Magellanic Cloud (LMC) have been conducted in the 3 mm band with the Mopra 22 m telescope to reveal chemical compositions in low metallicity conditions. Spectral lines of fundam...

Water deuteration and ortho-to-para nuclear spin ratio of H$_2$ in molecular clouds formed via the accumulation of H I gas

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Furuya, K.,   Aikawa, Y.,   Hincelin, U.,   Hassel, G.~E.,   Bergin, E.~A.,   Vasyunin, A.~I.

We investigate the water deuteration ratio and ortho-to-para nuclear spin ratio of H$_2$ (OPR(H$_2$)) during the formation and early evolution of a molecular cloud, following the scenario that accretion flows sweep and accumulate H i gas to form mole...

Double DCO$^+$ Rings Reveal CO Ice Desorption in the Outer Disk Around IM Lup

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Öberg, Karin I.,   Furuya, Kenji,   Loomis, Ryan,   Aikawa, Yuri,   Andrews, Sean M.,   Qi, Chunhua

In a protoplanetary disk, a combination of thermal and non-thermal desorption processes regulate where volatiles are liberated from icy grain mantles into the gas phase. Non-thermal desorption should result in volatile-enriched gas in disk-regions wh...

A new ray-tracing scheme for 3D diffuse radiation transfer on highly parallel architectures

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Tanaka, Satoshi,   Yoshikawa, Kohji,   Okamoto, Takashi,   Hasegawa, Kenji

We present a new numerical scheme to solve the transfer of diffuse radiation on three-dimensional mesh grids which is efficient on processors with highly parallel architecture such as recently popular GPUs and CPUs with multi- and many-core architect...

Early cosmic merger of multiple black holes

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Tagawa, H.,   Umemura, M.,   Gouda, N.,   Yano, T.,   Yamai, Y.

We perform numerical simulations on the merger of multiple black holes (BHs) in primordial gas at early cosmic epochs. We consider two cases of BH mass: M$_BH$ = 30 and 10$^4$ M$_☉$. Attention is concentrated on the effect of the dynamical friction b...

Light absorption efficiencies of photosynthetic pigments: the dependence on spectral types of central stars

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Komatsu, Yu,   Umemura, Masayuki,   Shoji, Mitsuo,   Kayanuma, Megumi,   Yabana, Kazuhiro,   Shiraishi, Kenji

For detecting life from reflection spectra on extrasolar planets, trace of photosynthesis is one of the indicators. However, it is not yet clear what kind of radiation environments is acceptable for photosynthesis. Light absorption in photosystems on...

Analytical Formulae of Molecular Ion Abundances and the N$_2$H$^+$ Ring in Protoplanetary Disks

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Aikawa, Yuri,   Furuya, Kenji,   Nomura, Hideko,   Qi, Chunhua

We investigate the chemistry of ion molecules in protoplanetary disks, motivated by the detection of the N$_2$H$^+$ ring around TW Hya. While the ring inner radius coincides with the CO snow line, it is not apparent why N$_2$H$^+$ is abundant outside...

Light absorption and excitation energy transfer calculations in primitive photosynthetic bacteria

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Komatsu, Yu,   Kayanuma, Megumi,   Shoji, Mitsuo,   Yabana, Kazuhiro,   Shiraishi, Kenji,   Umemura, Masayuki

In photosynthetic organisms, light energy is converted into chemical energy through the light absorption and excitation energy transfer (EET) processes. These processes start in light- harvesting complexes, which contain special photosynthetic pigmen...

IL-1 receptor antagonist-deficient mice develop autoimmune arthritis due to intrinsic activation of IL-17-producing CCR2$^+$V\ensuremathγ6$^+$\ensuremathγ\ensuremathδ T cells

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Akitsu, Aoi,   Ishigame, Harumichi,   Kakuta, Shigeru,   Chung, Soo-Hyun,   Ikeda, Satoshi,   Shimizu, Kenji

Interleukin-17 (IL-17)-producing \ensuremathγ\ensuremathδ T (\ensuremathγ\ensuremathδ17) cells have been implicated in inflammatory diseases, but the underlying pathogenic mechanisms remain unclear. Here, we show that both CD4$^+$ and \ensuremathγ\en...

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Galaxy-scale AGN feedback - theory

Wagner, A.~Y.,   Bicknell, G.~V.,   Umemura, M.,   Sutherland , R.~S.,   Silk, J.

Powerful relativistic jets in radio galaxies are capable of driving strong outflows but also inducing star-formation by pressure- triggering collapse of dense clouds. We review theoretical work on negative and positive active galactic nuclei feedback...

平成28年 2月  
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Radiation hydrodynamic simulations of line-driven disk winds for ultra-fast outflows

Nomura, Mariko,   Ohsuga, Ken,   Takahashi, Hiroyuki R.,   Wada, Keiichi,   Yoshida, Tessei

Using two-dimensional radiation hydrodynamic simulations, we investigate the origin of the ultra-fast outflows (UFOs) that are often observed in luminous active galactic nuclei (AGNs). We found that the radiation force due to the spectral lines gener...

平成28年 2月   Publications of the Astronomical Society of Japan
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Spectral Line Survey toward Molecular Clouds in the Large Magellanic Cloud

Nishimura, Yuri,   Shimonishi, Takashi,   Watanabe, Yoshimasa,   Sakai, Nami,   Aikawa, Yuri,   Kawamura, Akiko

Spectral line survey observations of seven molecular clouds in the Large Magellanic Cloud (LMC) have been conducted in the 3 mm band with the Mopra 22 m telescope to reveal chemical compositions in low metallicity conditions. Spectral lines of fundam...

平成28年 2月   The Astrophysical Journal
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Reconstructing the history of water ice formation from HDO/H$_2$O and D$_2$O/HDO ratios in protostellar cores

Furuya, K.,   van Dishoeck, E.~F.,   Aikawa, Y.

Recent interferometer observations have found that the D$_2$O/HDO abundance ratio is higher than that of HDO/H$_2$O by about one order of magnitude in the vicinity of low-mass protostar NGC 1333-IRAS 2A, where water ice has sublimated. Previous labor...

平成28年 2月  
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Water deuteration and ortho-to-para nuclear spin ratio of H$_2$ in molecular clouds formed via the accumulation of H I gas

Furuya, K.,   Aikawa, Y.,   Hincelin, U.,   Hassel, G.~E.,   Bergin, E.~A.,   Vasyunin, A.~I.

We investigate the water deuteration ratio and ortho-to-para nuclear spin ratio of H$_2$ (OPR(H$_2$)) during the formation and early evolution of a molecular cloud, following the scenario that accretion flows sweep and accumulate H i gas to form mole...

平成27年 12月  
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Double DCO$^+$ Rings Reveal CO Ice Desorption in the Outer Disk Around IM Lup

Öberg, Karin I.,   Furuya, Kenji,   Loomis, Ryan,   Aikawa, Yuri,   Andrews, Sean M.,   Qi, Chunhua

In a protoplanetary disk, a combination of thermal and non-thermal desorption processes regulate where volatiles are liberated from icy grain mantles into the gas phase. Non-thermal desorption should result in volatile-enriched gas in disk-regions wh...

平成27年 9月   The Astrophysical Journal
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A new ray-tracing scheme for 3D diffuse radiation transfer on highly parallel architectures

Tanaka, Satoshi,   Yoshikawa, Kohji,   Okamoto, Takashi,   Hasegawa, Kenji

We present a new numerical scheme to solve the transfer of diffuse radiation on three-dimensional mesh grids which is efficient on processors with highly parallel architecture such as recently popular GPUs and CPUs with multi- and many-core architect...

平成27年 8月   Publications of the Astronomical Society of Japan
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Early cosmic merger of multiple black holes

Tagawa, H.,   Umemura, M.,   Gouda, N.,   Yano, T.,   Yamai, Y.

We perform numerical simulations on the merger of multiple black holes (BHs) in primordial gas at early cosmic epochs. We consider two cases of BH mass: M$_BH$ = 30 and 10$^4$ M$_☉$. Attention is concentrated on the effect of the dynamical friction b...

平成27年 8月   Monthly Notices of the Royal Astronomical Society
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Light absorption efficiencies of photosynthetic pigments: the dependence on spectral types of central stars

Komatsu, Yu,   Umemura, Masayuki,   Shoji, Mitsuo,   Kayanuma, Megumi,   Yabana, Kazuhiro,   Shiraishi, Kenji

For detecting life from reflection spectra on extrasolar planets, trace of photosynthesis is one of the indicators. However, it is not yet clear what kind of radiation environments is acceptable for photosynthesis. Light absorption in photosystems on...

平成27年 7月  
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Analytical Formulae of Molecular Ion Abundances and the N$_2$H$^+$ Ring in Protoplanetary Disks

Aikawa, Yuri,   Furuya, Kenji,   Nomura, Hideko,   Qi, Chunhua

We investigate the chemistry of ion molecules in protoplanetary disks, motivated by the detection of the N$_2$H$^+$ ring around TW Hya. While the ring inner radius coincides with the CO snow line, it is not apparent why N$_2$H$^+$ is abundant outside...

平成27年 7月   The Astrophysical Journal
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Light absorption and excitation energy transfer calculations in primitive photosynthetic bacteria

Komatsu, Yu,   Kayanuma, Megumi,   Shoji, Mitsuo,   Yabana, Kazuhiro,   Shiraishi, Kenji,   Umemura, Masayuki

In photosynthetic organisms, light energy is converted into chemical energy through the light absorption and excitation energy transfer (EET) processes. These processes start in light- harvesting complexes, which contain special photosynthetic pigmen...

平成27年 6月  
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IL-1 receptor antagonist-deficient mice develop autoimmune arthritis due to intrinsic activation of IL-17-producing CCR2$^+$V\ensuremathγ6$^+$\ensuremathγ\ensuremathδ T cells

Akitsu, Aoi,   Ishigame, Harumichi,   Kakuta, Shigeru,   Chung, Soo-Hyun,   Ikeda, Satoshi,   Shimizu, Kenji

Interleukin-17 (IL-17)-producing \ensuremathγ\ensuremathδ T (\ensuremathγ\ensuremathδ17) cells have been implicated in inflammatory diseases, but the underlying pathogenic mechanisms remain unclear. Here, we show that both CD4$^+$ and \ensuremathγ\en...

平成27年 6月  

Galaxy-scale AGN feedback - theory

Wagner, A.~Y.,   Bicknell, G.~V.,   Umemura, M.,   Sutherland , R.~S.,   Silk, J.
平成28年 2月  

Radiation hydrodynamic simulations of line-driven disk winds for ultra-fast outflows

Nomura, Mariko,   Ohsuga, Ken,   Takahashi, Hiroyuki R.,   Wada, Keiichi,   Yoshida, Tessei
平成28年 2月   Publications of the Astronomical Society of Japan

Spectral Line Survey toward Molecular Clouds in the Large Magellanic Cloud

Nishimura, Yuri,   Shimonishi, Takashi,   Watanabe, Yoshimasa,   Sakai, Nami,   Aikawa, Yuri,   Kawamura, Akiko
平成28年 2月   The Astrophysical Journal

Reconstructing the history of water ice formation from HDO/H$_2$O and D$_2$O/HDO ratios in protostellar cores

Furuya, K.,   van Dishoeck, E.~F.,   Aikawa, Y.
平成28年 2月  

Water deuteration and ortho-to-para nuclear spin ratio of H$_2$ in molecular clouds formed via the accumulation of H I gas

Furuya, K.,   Aikawa, Y.,   Hincelin, U.,   Hassel, G.~E.,   Bergin, E.~A.,   Vasyunin, A.~I.
平成27年 12月  

Double DCO$^+$ Rings Reveal CO Ice Desorption in the Outer Disk Around IM Lup

Öberg, Karin I.,   Furuya, Kenji,   Loomis, Ryan,   Aikawa, Yuri,   Andrews, Sean M.,   Qi, Chunhua
平成27年 9月   The Astrophysical Journal

A new ray-tracing scheme for 3D diffuse radiation transfer on highly parallel architectures

Tanaka, Satoshi,   Yoshikawa, Kohji,   Okamoto, Takashi,   Hasegawa, Kenji
平成27年 8月   Publications of the Astronomical Society of Japan

Early cosmic merger of multiple black holes

Tagawa, H.,   Umemura, M.,   Gouda, N.,   Yano, T.,   Yamai, Y.
平成27年 8月   Monthly Notices of the Royal Astronomical Society

Light absorption efficiencies of photosynthetic pigments: the dependence on spectral types of central stars

Komatsu, Yu,   Umemura, Masayuki,   Shoji, Mitsuo,   Kayanuma, Megumi,   Yabana, Kazuhiro,   Shiraishi, Kenji
平成27年 7月  

Analytical Formulae of Molecular Ion Abundances and the N$_2$H$^+$ Ring in Protoplanetary Disks

Aikawa, Yuri,   Furuya, Kenji,   Nomura, Hideko,   Qi, Chunhua
平成27年 7月   The Astrophysical Journal

Light absorption and excitation energy transfer calculations in primitive photosynthetic bacteria

Komatsu, Yu,   Kayanuma, Megumi,   Shoji, Mitsuo,   Yabana, Kazuhiro,   Shiraishi, Kenji,   Umemura, Masayuki
平成27年 6月  

IL-1 receptor antagonist-deficient mice develop autoimmune arthritis due to intrinsic activation of IL-17-producing CCR2$^+$V\ensuremathγ6$^+$\ensuremathγ\ensuremathδ T cells

Akitsu, Aoi,   Ishigame, Harumichi,   Kakuta, Shigeru,   Chung, Soo-Hyun,   Ikeda, Satoshi,   Shimizu, Kenji
平成27年 6月