Search Results 1-20 of 452

  • Dust formation and evolution from mass-losing stars to the solar system  [in Japanese]

    瀧川 晶

    遊・星・人 = Planetary people : 日本惑星科学会誌 29(1), 4-13, 2020-03

  • Constraints on the formation of brown dwarfs by turbulent compression

    Stamer Torsten , Inutsuka Shu-ichiro

    … We perform radiation hydrodynamical simulations in spherical symmetry in order to investigate the formation of very low mass objects, i.e. brown dwarfs, by external compression. …

    Monthly Notices of the Royal Astronomical Society 488(2), 2644-2649, 2019-09

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  • Orbital evolution of a circumbinary planet in a gaseous disk

    Yamanaka Akihiro , Sasaki Takanori

    … Sub-Jupiter classed circumbinary planets discovered in close-in binary systems have orbits just beyond the dynamically unstable region, which is determined by the eccentricity and mass ratio of the host binary stars. … This outward transportation is driven by the balance of orbital excitation of the central stars inside the gravitationally unstable region and damping by the gas-drag force. …

    Earth, Planets and Space (71), 2019-07-30

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  • The turbulent formation of stars  [in Japanese]

    フェデラース クリストフ , 松本 倫明 [訳]

    パリティ = Parity : 物理科学雑誌 34(5), 6-10, 2019-05

  • Spatial Distribution of AlO in a High-mass Protostar Candidate Orion Source I

    Tachibana Shogo , Kamizuka Takafumi , Hirota Tomoya , Sakai Nami , Oya Yoko , Takigawa Aki , Yamamoto Satoshi

    … UTokyo FOCUS Press releases "Our history in the stars : Matter around a young star helps astronomers explore our stellar history" https://www.u-tokyo.ac.jp/focus/en/press/z0508_00043.html …

    The Astrophysical Journal 875(2), L29, 2019-04-24

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  • Performance Evaluation for a Contactless Micro Vibration Isolator Using the Flux Pinning Effect  [in Japanese]

    Shibata Takuma , Sakai Shin-ichiro

    … <p>Micro vibrations and heat generated by reaction wheels and a refrigerator cause a problem in observing stars or galaxies with high pointing accuracy. …

    JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 67(4), 126-135, 2019

    J-STAGE 

  • Formation of Star Clusters with multiple stellar populations in a Galaxy-Galaxy Merging Process  [in Japanese]

    MATSUI Hidenori , TANIKAWA Ataru , SAITOH Takayuki R.

    … These SCs with multiple stellar populations are produced by capturing dense gas and forming next generation stars when they pass dense gas regions. … Since the captured gas is contaminated with metal ejected from TypeII supernovae, such SCs consists of stars with different metallicity.</p> …

    Journal of The National Institute of Technology, Asahikawa College 55.56(0), 31-36, 2019

    J-STAGE 

  • Formation of the first generation of stars and blackholes in the Universe

    YOSHIDA Naoki

    … The standard theoretical model based on an array of recent observations accurately predicts the physical conditions in the early Universe, and powerful super-computers allow us to simulate in detail the formation and evolution of cosmic structure to the present epoch. … We review recent progress in the study on the first generation of stars and blackholes. … We focus on the physics of early structure formation, while identifying several key issues and open questions. …

    Proceedings of the Japan Academy, Series B 95(1), 17-28, 2019

    J-STAGE 

  • Distortion of Magnetic Fields in a Starless Core. V. Near-infrared and Submillimeter Polarization in FeSt 1-457

    Kandori Ryo , Nagata Tetsuya , Tazaki Ryo , Tamura Motohide , Saito Masao , Tomisaka Kohji , Matsumoto Tomoaki , Kusakabe Nobuhiko , Nakajima Yasushi , Kwon Jungmi , Nagayama Takahiro , Tatematsu Ken'ichi

    The Astrophysical Journal 868(2), 2018-11-27

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  • Distortion of Magnetic Fields in a Starless Core. IV. Magnetic Field Scaling on Density and Mass-to-flux Ratio Distribution in FeSt 1-457

    Kandori Ryo , Tomisaka Kohji , Tamura Motohide , Saito Masao , Kusakabe Nobuhiko , Nakajima Yasushi , Kwon Jungmi , Nagayama Takahiro , Nagata Tetsuya , Tatematsu Ken'ichi

    The Astrophysical Journal (865), 2018-09-28

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  • The Impact of Feedback in Massive Star Formation. II. Lower Star Formation Efficiency at Lower Metallicity

    Tanaka Kei E. I. , Tan Jonathan C. , Zhang Yichen , Hosokawa Takashi

    … We conduct a theoretical study of the formation of massive stars over a wide range of metallicities from 10⁻⁵ to 1 Z☉ and evaluate the star formation efficiencies (SFEs) from prestellar cloud cores taking into account multiple feedback processes. …

    The Astrophysical Journal 861(1), 2018-07-01

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  • RCW 36 in the Vela Molecular Ridge: Evidence for high-mass star-cluster formation triggered by cloud–cloud collision

    Sano Hidetoshi , Enokiya Rei , Hayashi Katsuhiro , Yamagishi Mitsuyoshi , Saeki Shun , Okawa Kazuki , Tsuge Kisetsu , Tsutsumi Daichi , Kohno Mikito , Hattori Yusuke , Yoshiike Satoshi , Fujita Shinji , Nishimura Atsushi , Ohama Akio , Tachihara Kengo , Torii Kazufumi , Hasegawa Yutaka , Kimura Kimihiro , Ogawa Hideo , Wong Graeme F , Braiding Catherine , Rowell Gavin , Burton Michael G , Fukui Yasuo

    … A collision between two molecular clouds is one possible candidate for high-mass star formation. … The H ii region RCW 36, located in the Vela molecular ridge, contains a young star cluster (∼ 1 Myr old) and two O-type stars. … We also found a high intensity ratio of ∼ 0.6–1.2 for CO J = 3–2/1–0 toward both clouds, indicating that the gas temperature has been increased due to heating by the O-type stars. …

    Publications of the Astronomical Society of Japan 70(SP2), S43, 2018-05

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  • Distortion of Magnetic Fields in a Starless Core. III. Polarization–Extinction Relationship in FeSt 1-457

    Kandori Ryo , Tamura Motohide , Nagata Tetsuya , Tomisaka Kohji , Kusakabe Nobuhiko , Nakajima Yasushi , Kwon Jungmi , Nagayama Takahiro , Tatematsu Ken'ichi

    The relationship between dust polarization and extinction was determined for the cold dense starless molecular cloud core FeSt 1-457 based on the background star polarimetry of dichroic extinction at …

    The Astrophysical Journal (857), 2018-04-20

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  • Anomaly of Hydrogen Recombination Line Ratio in Ultraluminous Infrared Galaxies

    矢野 健一 , 中川 貴雄 , Malkan Matthew , 磯部 直樹 , 白旗 麻衣 , 馬場 俊介 , 道井 亮介 , Bhalotia Vanshree , Yano Kenichi , Nakagawa Takao , Malkan Matthew , Isobe Naoki , Shirahata Mai , Baba Shunsuke , Doi Ryosuke , Bhalotia Vanshree

    … Hence our results suggest that star-formation activity in ULIRGs occurs preferentially in high-density clouds.Physical characteristics: Original contains color illustrations …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 379-382, 2018-03-09

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  • DEIMOS Spectroscopy of Star-Forming Galaxies in the AKARI North Ecliptic Pole-Deep Field

    Kim Helen K. , Malkan Matthew A. , 大井 渚 , Burgarella Denis , Buat Veronique , 高木 俊暢 , 松原 英雄 , Kim Helen K. , Malkan Matthew A. , Oi Nagisa , Burgarella Denis , Buat Veronique , Takagi Toshinobu , Matsuhara Hideo

    … Star formation rates (SFRs) were estimated from the luminosities of either brackets O II brackets lambda 3727 or H alpha, and agreed reasonably (50% scatter). …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 371-374, 2018-03-09

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  • Line flux measurement of infrared galaxies in the AKARI NEP field with Keck/DEIMOS

    正垣 綾乃 , 松浦 周二 , 大井 渚 , 後藤 友嗣 , 松原 英雄 , 村田 一心 , 高木 俊暢 , 大塚 拓也 , Malkan Matthew , 中禮 沙也加 , Shogaki Ayano , Matsuura Shuji , Oi Nagisa , Goto Tomotsugu , Matsuhara Hideo , Murata Kazumi , Takagi Toshinobu , Otsuka Takuya , Malkan Matthew , Churei Sayaka

    We analyzed 553 spectra of infrared sources in the AKARI NEP deep field observed with Keck/DEIMOS in 2011. In previous work, we conducted a spectroscopic diagnostics of the sources based on relative l …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 367-370, 2018-03-09

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  • AKARI MIR slitless spectroscopic survey of galaxies at z less than 0.5

    大山 陽一 , 和田 武彦 , 松原 英雄 , 高木 俊暢 , Malkan M. , 後藤 友嗣 , 江上 英一 , Lee Hyung Mok , Im Myung , Kim J. -H. , Pearson Chris , 稲見 華恵 , 大薮 進喜 , 臼井 文彦 , Burgarella Denis , Mazyed F. , 今西 昌俊 , Jeong Woong-Seob , 宮地 崇光 , DiazTello J. , 中川 貴雄 , Oyama Yoichi , Wada Takehiko , Matsuhara Hideo , Takagi Toshinobu , Malkan M. , Goto Tomotsugu , Egami Eiichi , Lee Hyung Mok , Im Myung , Kim J. -H. , Pearson Chris , Inami Hanae , Oyabu Shinki , Usui Fumihiko , Burgarella Denis , Mazyed F. , Imanishi Masatoshi , Jeong Woong-Seob , Miyaji Takamitsu , DiazTello J. , Nakagawa Takao

    … We aim to study star-forming galaxies by using a blind spectroscopic survey at mid-infrared (MIR) wavelengths to understand evolution of their star formation rate (SFR) and specific SFR (SFR per stellar mass) up to z in the order of 0.5, by paying particular attention to their Polycyclic Aromatic Hydrocarbon (PAH) properties. …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 359-362, 2018-03-09

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  • Surface density: a new parameter in the fundamental metallicity relation of star-forming galaxies

    橋本 哲也 , 後藤 友嗣 , 百瀬 莉恵子 , Hashimoto Tetsuya , Goto Tomotsugu , Momose Rieko

    … Star-forming galaxies display a close relation among stellar mass, metallicity and star-formation rate (or molecular-gas mass). … The dilution time scale of gas inflow and the star-formation efficiency could explain the observational dependence on surface density of stellar mass. …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 351-354, 2018-03-09

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  • A systematic search for ULIRGs/HyLIRGs at intermediate redshifts with optically-faint AKARI FIS Bright sources

    Chen Xiaoyang , 秋山 正幸 , 野田 博文 , 渡邉 達朗 , Abdurrouf , 鳥羽 儀樹 , 山村 一誠 , Chen Xiaoyang , Akiyama Masayuki , Noda Hirofumi , Watanabe Tatsuro , Abdurrouf , Toba Yoshiki , Yamamura Issei

    … The co-existence of extreme outflow and high SFR (in the order of 1000 solar mass yr(exp -1)) suggest the galaxy evolves into its most active stage when both of the AGN and star formation activities reach the peak period.Physical characteristics: Original contains color illustrations …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 345-346, 2018-03-09

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