Ja En Unravelling the enigmatic ISM conditions in Minkowski's object
Zovaro, Henry R.~M., Sharp, Robert, Nesvadba, Nicole P.~H., Kewley, Lisa, Sutherland, Ralph, Taylor, Philip
...
研究成果・発表論文
Cosmological Vlasov─Poisson Simulations of Structure Formation with Relic Neutrinos: Nonlinear Clustering and the Neutrino Mass
Yoshikawa, Kohji, Tanaka, Satoshi, Yoshida, Naoki, Saito, Shun
...
2D numerical study for magnetic field dependence of neutrino-driven core-collapse supernova models
Matsumoto, J., Takiwaki, T., Kotake, K., Asahina, Y., Takahashi, H.~R.
...
CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview
Inoue, Akio K., Yamanaka, Satoshi, Ouchi, Masami, Iwata, Ikuru, Shimasaku, Kazuhiro, Taniguchi, Yoshiaki
...
Shock-multicloud interactions in galactic outflows - I. Cloud layers with lognormal density distributions
Banda-Barragán, W.~E., Brüggen, M., Federrath, C., Wagner, A.~Y., Scannapieco, E., Cottle, J.
...
The CO universe: modelling CO emission and H$_2$ abundance in cosmological galaxy formation simulations
Inoue, Shigeki, Yoshida, Naoki, Yajima, Hidenobu
...
Starbursting [O III] emitters and quiescent [C II] emitters in the reionization era
Arata, Shohei, Yajima, Hidenobu, Nagamine, Kentaro, Abe, Makito, Khochfar, Sadegh
...
The thermal-radiative wind in the neutron star low-mass X-ray binary GX 13 + 1
Tomaru, Ryota, Done, Chris, Ohsuga, Ken, Odaka, Hirokazu, Takahashi, Tadayuki
...
Radiation Magnetohydrodynamic Simulations of Sub-Eddington Accretion Flows in AGNs: Origin of Soft X-Ray Excess and Rapid Time Variabilities
Igarashi, Taichi, Kato, Yoshiaki, Takahashi, Hiroyuki R., Ohsuga, Ken, Matsumoto, Yosuke, Matsumoto, Ryoji
...
Formation of massive stars under protostellar radiation feedback: very metal-poor stars
Fukushima, Hajime, Hosokawa, Takashi, Chiaki, Gen, Omukai, Kazuyuki, Yoshida, Naoki, Kuiper, Rolf
...
Star cluster formation and cloud dispersal by radiative feedback: dependence on metallicity and compactness
Fukushima, Hajime, Yajima, Hidenobu, Sugimura, Kazuyuki, Hosokawa, Takashi, Omukai, Kazuyuki, Matsumoto, Tomoaki
...
Extremely Metal-poor Representatives Explored by the Subaru Survey (EMPRESS). I. A Successful Machine-learning Selection of Metal-poor Galaxies and the Discovery of a Galaxy with M* < 10$^6$ M$_\ensuremathødot$ and 0.016 Z$_\ensuremathødot$
Kojima, Takashi, Ouchi, Masami, Rauch, Michael, Ono, Yoshiaki, Nakajima, Kimihiko, Isobe, Yuki
...
High circular polarization of near-infrared light induced by micron-sized dust grains
Fukushima, Hajime, Yajima, Hidenobu, Umemura, Masayuki
...
Gas, dust, and star formation in the positive AGN feedback candidate 4C 41.17 at z = 3.8
Nesvadba, N.~P.~H., Bicknell, G.~V., Mukherjee, D., Wagner, A.~Y.
...
Chemical Variation among Protostellar Cores: Dependence on Prestellar Core Conditions
Aikawa, Yuri, Furuya, Kenji, Yamamoto, Satoshi, Sakai, Nami
...
The thermal-radiative wind in low-mass X-ray binary H1743-322 - II. Iron line predictions from Monte Carlo radiation transfer
Tomaru, Ryota, Done, Chris, Ohsuga, Ken, Odaka, Hirokazu, Takahashi, Tadayuki
...
R-process enrichment in ultrafaint dwarf galaxies
Tarumi, Yuta, Yoshida, Naoki, Inoue, Shigeki
...
Line-driven disc wind in near-Eddington active galactic nuclei: decrease of mass accretion rate due to powerful outflow
Nomura, Mariko, Ohsuga, Ken, Done, Chris
...
ART$^2$: a 3D parallel multiwavelength radiative transfer code for continuum and atomic and molecular lines
Li, Yuexing, Gu, Ming F., Yajima, Hidenobu, Zhu, Qirong, Maji, Moupiya
...
Polarization imaging of M 87 jets by general relativistic radiative transfer calculation based on GRMHD simulations
Tsunetoe, Yuh, Mineshige, Shin, Ohsuga, Ken, Kawashima, Tomohisa, Akiyama, Kazunori
...
Deeply cooled core of the Phoenix galaxy cluster imaged by ALMA with the Sunyaev-Zel'dovich effect
Kitayama, Tetsu, Ueda, Shutaro, Akahori, Takuya, Komatsu, Eiichiro, Kawabe, Ryohei, Kohno, Kotaro
...
Pulsed fraction of super-critical column accretion flows on to neutron stars: Modeling of ultraluminous X-ray pulsars
Inoue, Akihiro, Ohsuga, Ken, Kawashima, Tomohisa
...
Unravelling the enigmatic ISM conditions in Minkowski's object
Zovaro, Henry R.~M., Sharp, Robert, Nesvadba, Nicole P.~H., Kewley, Lisa, Sutherland, Ralph, Taylor, Philip
...
令和2年 12月 Monthly Notices of the Royal Astronomical Society
Cosmological Vlasov─Poisson Simulations of Structure Formation with Relic Neutrinos: Nonlinear Clustering and the Neutrino Mass
Yoshikawa, Kohji, Tanaka, Satoshi, Yoshida, Naoki, Saito, Shun
...
令和2年 12月 The Astrophysical Journal
2D numerical study for magnetic field dependence of neutrino-driven core-collapse supernova models
Matsumoto, J., Takiwaki, T., Kotake, K., Asahina, Y., Takahashi, H.~R.
...
令和2年 12月 Monthly Notices of the Royal Astronomical Society
CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview
Inoue, Akio K., Yamanaka, Satoshi, Ouchi, Masami, Iwata, Ikuru, Shimasaku, Kazuhiro, Taniguchi, Yoshiaki
...
令和2年 12月 Publications of the Astronomical Society of Japan
Shock-multicloud interactions in galactic outflows - I. Cloud layers with lognormal density distributions
Banda-Barragán, W.~E., Brüggen, M., Federrath, C., Wagner, A.~Y., Scannapieco, E., Cottle, J.
...
令和2年 12月 Monthly Notices of the Royal Astronomical Society
The CO universe: modelling CO emission and H$_2$ abundance in cosmological galaxy formation simulations
Inoue, Shigeki, Yoshida, Naoki, Yajima, Hidenobu
...
令和2年 11月 Monthly Notices of the Royal Astronomical Society
Starbursting [O III] emitters and quiescent [C II] emitters in the reionization era
Arata, Shohei, Yajima, Hidenobu, Nagamine, Kentaro, Abe, Makito, Khochfar, Sadegh
...
令和2年 11月 Monthly Notices of the Royal Astronomical Society
The thermal-radiative wind in the neutron star low-mass X-ray binary GX 13 + 1
Tomaru, Ryota, Done, Chris, Ohsuga, Ken, Odaka, Hirokazu, Takahashi, Tadayuki
...
令和2年 10月 Monthly Notices of the Royal Astronomical Society
Radiation Magnetohydrodynamic Simulations of Sub-Eddington Accretion Flows in AGNs: Origin of Soft X-Ray Excess and Rapid Time Variabilities
Igarashi, Taichi, Kato, Yoshiaki, Takahashi, Hiroyuki R., Ohsuga, Ken, Matsumoto, Yosuke, Matsumoto, Ryoji
...
令和2年 10月 The Astrophysical Journal
Formation of massive stars under protostellar radiation feedback: very metal-poor stars
Fukushima, Hajime, Hosokawa, Takashi, Chiaki, Gen, Omukai, Kazuyuki, Yoshida, Naoki, Kuiper, Rolf
...
令和2年 9月 Monthly Notices of the Royal Astronomical Society
Star cluster formation and cloud dispersal by radiative feedback: dependence on metallicity and compactness
Fukushima, Hajime, Yajima, Hidenobu, Sugimura, Kazuyuki, Hosokawa, Takashi, Omukai, Kazuyuki, Matsumoto, Tomoaki
...
令和2年 9月 Monthly Notices of the Royal Astronomical Society
Extremely Metal-poor Representatives Explored by the Subaru Survey (EMPRESS). I. A Successful Machine-learning Selection of Metal-poor Galaxies and the Discovery of a Galaxy with M* < 10$^6$ M$_\ensuremathødot$ and 0.016 Z$_\ensuremathødot$
Kojima, Takashi, Ouchi, Masami, Rauch, Michael, Ono, Yoshiaki, Nakajima, Kimihiko, Isobe, Yuki
...
令和2年 8月 The Astrophysical Journal
High circular polarization of near-infrared light induced by micron-sized dust grains
Fukushima, Hajime, Yajima, Hidenobu, Umemura, Masayuki
...
令和2年 8月 Monthly Notices of the Royal Astronomical Society
Gas, dust, and star formation in the positive AGN feedback candidate 4C 41.17 at z = 3.8
Nesvadba, N.~P.~H., Bicknell, G.~V., Mukherjee, D., Wagner, A.~Y.
...
令和2年 7月
Chemical Variation among Protostellar Cores: Dependence on Prestellar Core Conditions
Aikawa, Yuri, Furuya, Kenji, Yamamoto, Satoshi, Sakai, Nami
...
令和2年 7月 The Astrophysical Journal
The thermal-radiative wind in low-mass X-ray binary H1743-322 - II. Iron line predictions from Monte Carlo radiation transfer
Tomaru, Ryota, Done, Chris, Ohsuga, Ken, Odaka, Hirokazu, Takahashi, Tadayuki
...
令和2年 5月 Monthly Notices of the Royal Astronomical Society
R-process enrichment in ultrafaint dwarf galaxies
Tarumi, Yuta, Yoshida, Naoki, Inoue, Shigeki
...
令和2年 5月 Monthly Notices of the Royal Astronomical Society
Line-driven disc wind in near-Eddington active galactic nuclei: decrease of mass accretion rate due to powerful outflow
Nomura, Mariko, Ohsuga, Ken, Done, Chris
...
令和2年 5月 Monthly Notices of the Royal Astronomical Society
ART$^2$: a 3D parallel multiwavelength radiative transfer code for continuum and atomic and molecular lines
Li, Yuexing, Gu, Ming F., Yajima, Hidenobu, Zhu, Qirong, Maji, Moupiya
...
令和2年 5月 Monthly Notices of the Royal Astronomical Society
Polarization imaging of M 87 jets by general relativistic radiative transfer calculation based on GRMHD simulations
Tsunetoe, Yuh, Mineshige, Shin, Ohsuga, Ken, Kawashima, Tomohisa, Akiyama, Kazunori
...
令和2年 4月 Publications of the Astronomical Society of Japan
Deeply cooled core of the Phoenix galaxy cluster imaged by ALMA with the Sunyaev-Zel'dovich effect
Kitayama, Tetsu, Ueda, Shutaro, Akahori, Takuya, Komatsu, Eiichiro, Kawabe, Ryohei, Kohno, Kotaro
...
令和2年 4月 Publications of the Astronomical Society of Japan
Pulsed fraction of super-critical column accretion flows on to neutron stars: Modeling of ultraluminous X-ray pulsars
Inoue, Akihiro, Ohsuga, Ken, Kawashima, Tomohisa
...
令和2年 4月 Publications of the Astronomical Society of JapanUnravelling the enigmatic ISM conditions in Minkowski's object
Zovaro, Henry R.~M., Sharp, Robert, Nesvadba, Nicole P.~H., Kewley, Lisa, Sutherland, Ralph, Taylor, Philip
令和2年 12月 Monthly Notices of the Royal Astronomical SocietyCosmological Vlasov─Poisson Simulations of Structure Formation with Relic Neutrinos: Nonlinear Clustering and the Neutrino Mass
Yoshikawa, Kohji, Tanaka, Satoshi, Yoshida, Naoki, Saito, Shun
令和2年 12月 The Astrophysical Journal2D numerical study for magnetic field dependence of neutrino-driven core-collapse supernova models
Matsumoto, J., Takiwaki, T., Kotake, K., Asahina, Y., Takahashi, H.~R.
令和2年 12月 Monthly Notices of the Royal Astronomical SocietyCHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview
Inoue, Akio K., Yamanaka, Satoshi, Ouchi, Masami, Iwata, Ikuru, Shimasaku, Kazuhiro, Taniguchi, Yoshiaki
令和2年 12月 Publications of the Astronomical Society of JapanShock-multicloud interactions in galactic outflows - I. Cloud layers with lognormal density distributions
Banda-Barragán, W.~E., Brüggen, M., Federrath, C., Wagner, A.~Y., Scannapieco, E., Cottle, J.
令和2年 12月 Monthly Notices of the Royal Astronomical SocietyThe CO universe: modelling CO emission and H$_2$ abundance in cosmological galaxy formation simulations
Inoue, Shigeki, Yoshida, Naoki, Yajima, Hidenobu
令和2年 11月 Monthly Notices of the Royal Astronomical SocietyStarbursting [O III] emitters and quiescent [C II] emitters in the reionization era
Arata, Shohei, Yajima, Hidenobu, Nagamine, Kentaro, Abe, Makito, Khochfar, Sadegh
令和2年 11月 Monthly Notices of the Royal Astronomical SocietyThe thermal-radiative wind in the neutron star low-mass X-ray binary GX 13 + 1
Tomaru, Ryota, Done, Chris, Ohsuga, Ken, Odaka, Hirokazu, Takahashi, Tadayuki
令和2年 10月 Monthly Notices of the Royal Astronomical SocietyRadiation Magnetohydrodynamic Simulations of Sub-Eddington Accretion Flows in AGNs: Origin of Soft X-Ray Excess and Rapid Time Variabilities
Igarashi, Taichi, Kato, Yoshiaki, Takahashi, Hiroyuki R., Ohsuga, Ken, Matsumoto, Yosuke, Matsumoto, Ryoji
令和2年 10月 The Astrophysical JournalFormation of massive stars under protostellar radiation feedback: very metal-poor stars
Fukushima, Hajime, Hosokawa, Takashi, Chiaki, Gen, Omukai, Kazuyuki, Yoshida, Naoki, Kuiper, Rolf
令和2年 9月 Monthly Notices of the Royal Astronomical SocietyStar cluster formation and cloud dispersal by radiative feedback: dependence on metallicity and compactness
Fukushima, Hajime, Yajima, Hidenobu, Sugimura, Kazuyuki, Hosokawa, Takashi, Omukai, Kazuyuki, Matsumoto, Tomoaki
令和2年 9月 Monthly Notices of the Royal Astronomical SocietyExtremely Metal-poor Representatives Explored by the Subaru Survey (EMPRESS). I. A Successful Machine-learning Selection of Metal-poor Galaxies and the Discovery of a Galaxy with M* < 10$^6$ M$_\ensuremathødot$ and 0.016 Z$_\ensuremathødot$
Kojima, Takashi, Ouchi, Masami, Rauch, Michael, Ono, Yoshiaki, Nakajima, Kimihiko, Isobe, Yuki
令和2年 8月 The Astrophysical JournalHigh circular polarization of near-infrared light induced by micron-sized dust grains
Fukushima, Hajime, Yajima, Hidenobu, Umemura, Masayuki
令和2年 8月 Monthly Notices of the Royal Astronomical SocietyGas, dust, and star formation in the positive AGN feedback candidate 4C 41.17 at z = 3.8
Nesvadba, N.~P.~H., Bicknell, G.~V., Mukherjee, D., Wagner, A.~Y.
令和2年 7月Chemical Variation among Protostellar Cores: Dependence on Prestellar Core Conditions
Aikawa, Yuri, Furuya, Kenji, Yamamoto, Satoshi, Sakai, Nami
令和2年 7月 The Astrophysical JournalThe thermal-radiative wind in low-mass X-ray binary H1743-322 - II. Iron line predictions from Monte Carlo radiation transfer
Tomaru, Ryota, Done, Chris, Ohsuga, Ken, Odaka, Hirokazu, Takahashi, Tadayuki
令和2年 5月 Monthly Notices of the Royal Astronomical SocietyR-process enrichment in ultrafaint dwarf galaxies
Tarumi, Yuta, Yoshida, Naoki, Inoue, Shigeki
令和2年 5月 Monthly Notices of the Royal Astronomical SocietyLine-driven disc wind in near-Eddington active galactic nuclei: decrease of mass accretion rate due to powerful outflow
Nomura, Mariko, Ohsuga, Ken, Done, Chris
令和2年 5月 Monthly Notices of the Royal Astronomical SocietyART$^2$: a 3D parallel multiwavelength radiative transfer code for continuum and atomic and molecular lines
Li, Yuexing, Gu, Ming F., Yajima, Hidenobu, Zhu, Qirong, Maji, Moupiya
令和2年 5月 Monthly Notices of the Royal Astronomical SocietyPolarization imaging of M 87 jets by general relativistic radiative transfer calculation based on GRMHD simulations
Tsunetoe, Yuh, Mineshige, Shin, Ohsuga, Ken, Kawashima, Tomohisa, Akiyama, Kazunori
令和2年 4月 Publications of the Astronomical Society of JapanDeeply cooled core of the Phoenix galaxy cluster imaged by ALMA with the Sunyaev-Zel'dovich effect
Kitayama, Tetsu, Ueda, Shutaro, Akahori, Takuya, Komatsu, Eiichiro, Kawabe, Ryohei, Kohno, Kotaro
令和2年 4月 Publications of the Astronomical Society of JapanPulsed fraction of super-critical column accretion flows on to neutron stars: Modeling of ultraluminous X-ray pulsars
Inoue, Akihiro, Ohsuga, Ken, Kawashima, Tomohisa
令和2年 4月 Publications of the Astronomical Society of Japan- Unravelling the enigmatic ISM conditions in Minkowski's object Zovaro, Henry R.~M., Sharp, Robert, Nesvadba, Nicole P.~H., Kewley, Lisa, Sutherland, Ralph, Taylor, Philip ... , 令和2年 12月 , Monthly Notices of the Royal Astronomical Society
- Cosmological Vlasov─Poisson Simulations of Structure Formation with Relic Neutrinos: Nonlinear Clustering and the Neutrino Mass Yoshikawa, Kohji, Tanaka, Satoshi, Yoshida, Naoki, Saito, Shun , 令和2年 12月 , The Astrophysical Journal
- 2D numerical study for magnetic field dependence of neutrino-driven core-collapse supernova models Matsumoto, J., Takiwaki, T., Kotake, K., Asahina, Y., Takahashi, H.~R. , 令和2年 12月 , Monthly Notices of the Royal Astronomical Society
- CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview Inoue, Akio K., Yamanaka, Satoshi, Ouchi, Masami, Iwata, Ikuru, Shimasaku, Kazuhiro, Taniguchi, Yoshiaki ... , 令和2年 12月 , Publications of the Astronomical Society of Japan
- Shock-multicloud interactions in galactic outflows - I. Cloud layers with lognormal density distributions Banda-Barragán, W.~E., Brüggen, M., Federrath, C., Wagner, A.~Y., Scannapieco, E., Cottle, J. , 令和2年 12月 , Monthly Notices of the Royal Astronomical Society
- The CO universe: modelling CO emission and H$_2$ abundance in cosmological galaxy formation simulations Inoue, Shigeki, Yoshida, Naoki, Yajima, Hidenobu , 令和2年 11月 , Monthly Notices of the Royal Astronomical Society
- Starbursting [O III] emitters and quiescent [C II] emitters in the reionization era Arata, Shohei, Yajima, Hidenobu, Nagamine, Kentaro, Abe, Makito, Khochfar, Sadegh , 令和2年 11月 , Monthly Notices of the Royal Astronomical Society
- The thermal-radiative wind in the neutron star low-mass X-ray binary GX 13 + 1 Tomaru, Ryota, Done, Chris, Ohsuga, Ken, Odaka, Hirokazu, Takahashi, Tadayuki , 令和2年 10月 , Monthly Notices of the Royal Astronomical Society
- Radiation Magnetohydrodynamic Simulations of Sub-Eddington Accretion Flows in AGNs: Origin of Soft X-Ray Excess and Rapid Time Variabilities Igarashi, Taichi, Kato, Yoshiaki, Takahashi, Hiroyuki R., Ohsuga, Ken, Matsumoto, Yosuke, Matsumoto, Ryoji , 令和2年 10月 , The Astrophysical Journal
- Formation of massive stars under protostellar radiation feedback: very metal-poor stars Fukushima, Hajime, Hosokawa, Takashi, Chiaki, Gen, Omukai, Kazuyuki, Yoshida, Naoki, Kuiper, Rolf , 令和2年 9月 , Monthly Notices of the Royal Astronomical Society
- Star cluster formation and cloud dispersal by radiative feedback: dependence on metallicity and compactness Fukushima, Hajime, Yajima, Hidenobu, Sugimura, Kazuyuki, Hosokawa, Takashi, Omukai, Kazuyuki, Matsumoto, Tomoaki , 令和2年 9月 , Monthly Notices of the Royal Astronomical Society
- Extremely Metal-poor Representatives Explored by the Subaru Survey (EMPRESS). I. A Successful Machine-learning Selection of Metal-poor Galaxies and the Discovery of a Galaxy with M* < 10$^6$ M$_\ensuremathødot$ and 0.016 Z$_\ensuremathødot$ Kojima, Takashi, Ouchi, Masami, Rauch, Michael, Ono, Yoshiaki, Nakajima, Kimihiko, Isobe, Yuki ... , 令和2年 8月 , The Astrophysical Journal
- High circular polarization of near-infrared light induced by micron-sized dust grains Fukushima, Hajime, Yajima, Hidenobu, Umemura, Masayuki , 令和2年 8月 , Monthly Notices of the Royal Astronomical Society
- Gas, dust, and star formation in the positive AGN feedback candidate 4C 41.17 at z = 3.8 Nesvadba, N.~P.~H., Bicknell, G.~V., Mukherjee, D., Wagner, A.~Y. , 令和2年 7月 ,
- Chemical Variation among Protostellar Cores: Dependence on Prestellar Core Conditions Aikawa, Yuri, Furuya, Kenji, Yamamoto, Satoshi, Sakai, Nami , 令和2年 7月 , The Astrophysical Journal
- The thermal-radiative wind in low-mass X-ray binary H1743-322 - II. Iron line predictions from Monte Carlo radiation transfer Tomaru, Ryota, Done, Chris, Ohsuga, Ken, Odaka, Hirokazu, Takahashi, Tadayuki , 令和2年 5月 , Monthly Notices of the Royal Astronomical Society
- R-process enrichment in ultrafaint dwarf galaxies Tarumi, Yuta, Yoshida, Naoki, Inoue, Shigeki , 令和2年 5月 , Monthly Notices of the Royal Astronomical Society
- Line-driven disc wind in near-Eddington active galactic nuclei: decrease of mass accretion rate due to powerful outflow Nomura, Mariko, Ohsuga, Ken, Done, Chris , 令和2年 5月 , Monthly Notices of the Royal Astronomical Society
- ART$^2$: a 3D parallel multiwavelength radiative transfer code for continuum and atomic and molecular lines Li, Yuexing, Gu, Ming F., Yajima, Hidenobu, Zhu, Qirong, Maji, Moupiya , 令和2年 5月 , Monthly Notices of the Royal Astronomical Society
- Polarization imaging of M 87 jets by general relativistic radiative transfer calculation based on GRMHD simulations Tsunetoe, Yuh, Mineshige, Shin, Ohsuga, Ken, Kawashima, Tomohisa, Akiyama, Kazunori , 令和2年 4月 , Publications of the Astronomical Society of Japan
- Deeply cooled core of the Phoenix galaxy cluster imaged by ALMA with the Sunyaev-Zel'dovich effect Kitayama, Tetsu, Ueda, Shutaro, Akahori, Takuya, Komatsu, Eiichiro, Kawabe, Ryohei, Kohno, Kotaro ... , 令和2年 4月 , Publications of the Astronomical Society of Japan
- Pulsed fraction of super-critical column accretion flows on to neutron stars: Modeling of ultraluminous X-ray pulsars Inoue, Akihiro, Ohsuga, Ken, Kawashima, Tomohisa , 令和2年 4月 , Publications of the Astronomical Society of Japan