Star Formation Study Based on Polarization and Radiation Transfer: Role of Interstellar Magnetic Field

• Project/Area Number: 15K05032
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Tomisaka Kohji 国立天文台, 理論研究部, 教授 (70183879)
• Co-Investigator(Kenkyū-buntansha): 町田 正博 九州大学, 理学研究院, 准教授 (10402786)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 星間磁場 / 偏波 / 星形成 / 磁気流体力学 / フィラメント / 圧力平衡 / 重力安定性 / 偏光・偏波 / 観測的可視化

Outline of Final Research Achievements

Combining Herschel Space Observatory far infrared observations and interstellar polarization observations, it is shown molecular clouds are formed by ensembles of filaments which are perpendicularly threaded by the magnetic field. We obtained the magnetohydrostatic configuration and their maximum stable line-mass as a function of the magnetic flux per unit mass. Stability of such filament is studied with magnetohydrodynamical simulations. There exists the shortest wavelength above which the filament undergoes the gravitational instability (critical wavelength). The most unstable mode has a wavelength twice as long as the critical wavelength. The filament fragments with the most unstable wavelength and experiences runaway collapse as long as the gas is isothermal and forms a pseudo-disk which extends in the direction perpendicular to the magnetic field.

Research Products

• [Journal Article] Circumnuclear Multi-phase Gas in the Circinus Galaxy. I. Non-LTE Calculations of CO Lines (2018)
  • Author(s): Wada Keiichi、Fukushige Ryosuke、Izumi Takuma、Tomisaka Kohji
  • Journal Title: The Astrophysical Journal Volume: 852 Issue: 2 Pages: 88-88
  • DOI: 10.3847/1538-4357/aa9e53
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Massive outflows driven by magnetic effects - II. Comparison with observations (2018)
  • Author(s): Matsushita, Yuko; Sakurai, Yuya; Hosokawa, Takashi; Machida, Masahiro N.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 475 Issue: 1 Pages: 391-403
  • DOI: 10.1093/mnras/stx3070
  • Peer Reviewed
• [Journal Article] Different modes of star formation: gravitational collapse of magnetically subcritical cloud (2018)
  • Author(s): Machida, Masahiro N.; Higuchi, Koki; Okuzumi, Satoshi
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 473 Issue: 3 Pages: 3080-3094
  • DOI: 10.1093/mnras/stx2589
  • Peer Reviewed
• [Journal Article] Massive outflows driven by magnetic effects in star-forming clouds with high mass accretion rates (2018)
  • Author(s): Matsushita, Yuko; Machida, Masahiro N.; Sakurai, Yuya; Hosokawa, Takashi
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 475 Issue: 1 Pages: 1026-1049
  • DOI: 10.1093/mnras/stx893
  • Peer Reviewed
• [Journal Article] ALMA Observations of SMM11 Reveal an Extremely Young Protostar in Serpens Main Cluster (2017)
  • Author(s): Aso Yusuke、Ohashi Nagayoshi、Aikawa Yuri、Machida Masahiro N.、Saigo Kazuya、Saito Masao、Takakuwa Shigehisa、Tomida Kengo、Tomisaka Kohji、Yen Hsi-Wei、Williams Jonathan P.
  • Journal Title: The Astrophysical Journal Volume: 850 Issue: 1 Pages: L2-L2
  • DOI: 10.3847/2041-8213/aa9701
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] ALMA Observations of the Protostar L1527 IRS: Probing Details of the Disk and the Envelope Structures (2017)
  • Author(s): Aso Yusuke、Ohashi Nagayoshi、Aikawa Yuri、Machida Masahiro N.、Saigo Kazuya、Saito Masao、Takakuwa Shigehisa、Tomida Kengo、Tomisaka Kohji、Yen Hsi-Wei
  • Journal Title: The Astrophysical Journal Volume: 849 Issue: 1 Pages: 56-56
  • DOI: 10.3847/1538-4357/aa8264
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Distortion of Magnetic Fields in a Starless Core II: 3D Magnetic Field Structure of FeSt 1-457 (2017)
  • Author(s): Kandori et al.
  • Journal Title: The Astrophysical Journal Volume: 848 Issue: 2 Pages: 110-110
  • DOI: 10.3847/1538-4357/aa8d18
  • Peer Reviewed / Open Access
• [Journal Article] Fragmentation of a Filamentary Cloud Permeated by a Perpendicular Magnetic Field (2017)
  • Author(s): Hanawa Tomoyuki、Kudoh Takahiro、Tomisaka Kohji
  • Journal Title: The Astrophysical Journal Volume: 848 Issue: 1 Pages: 2-2
  • DOI: 10.3847/1538-4357/aa8b6d
  • Peer Reviewed / Open Access
• [Journal Article] Distortion of Magnetic Fields in a Starless Core: Near-infrared Polarimetry of FeSt 1-457 (2017)
  • Author(s): Kandori, R., Tamura, M., Kusakabe, N., Nakajima, Y., Kwon, J., Nagayama, T., Nagata, T., Tomisaka, K., Tatematsu, K.
  • Journal Title: The Astrophysical Journal Volume: 845 Issue: 1 Pages: 32-32
  • DOI: 10.3847/1538-4357/aa7d58
  • NAID: 120006782214
  • Peer Reviewed / Open Access
• [Journal Article] The Evidence of Radio Polarization Induced by the Radiative Grain Alignment and Self-scattering of Dust Grains in a Protoplanetary Disk (2017)
  • Author(s): Kataoka Akimasa、Tsukagoshi Takashi、Pohl Adriana、Muto Takayuki、Nagai Hiroshi、Stephens Ian W.、Tomisaka Kohji、Momose Munetake
  • Journal Title: The Astrophysical Journal Volume: 844 Issue: 1 Pages: L5-L5
  • DOI: 10.3847/2041-8213/aa7e33
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] First Results from BISTRO: A SCUBA-2 Polarimeter Survey of the Gould Belt (2017)
  • Author(s): Ward-Thompson, Derek et al.
  • Journal Title: The Astrophysical Journal Volume: 842 Issue: 1 Pages: 66-76
  • DOI: 10.3847/1538-4357/aa70a0
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The impact of the Hall effect during cloud core collapse: Implications for circumstellar disk evolution (2017)
  • Author(s): Tsukamoto Yusuke、Okuzumi Satoshi、Iwasaki Kazunari、Machida Masahiro N.、Inutsuka Shu-ichiro
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Issue: 6
  • DOI: 10.1093/pasj/psx113
  • Peer Reviewed
• [Journal Article] A Detached Protostellar Disk around a ~0.2 Mo Protostar in a Possible Site of a Multiple Star Formation in a Dynamical Environment in Taurus (2017)
  • Author(s): Tokuda Kazuki、Onishi Toshikazu、Saigo Kazuya、Hosokawa Takashi、Matsumoto Tomoaki、Inutsuka Shu-ichiro、Machida Masahiro N.、Tomida Kengo、Kunitomo Masanobu、Kawamura Akiko、Fukui Yasuo、Tachihara Kengo
  • Journal Title: The Astrophysical Journal Volume: 849 Issue: 2 Pages: 101-101
  • DOI: 10.3847/1538-4357/aa8e9e
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Disk-driven rotating bipolar outflow in Orion Source I (2017)
  • Author(s): 10.Hirota, T. *, Machida, M. N., Matsushita, Y., Motogi, K., Matsumoto, N., Kim, M. K., Burns, R. A., Honma, M.
  • Journal Title: Nature Astronomy Volume: 1 Issue: 7 Pages: 0146-0146
  • DOI: 10.1038/s41550-017-0146
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Circumstellar disks and outflows in turbulent molecular cloud cores: possible formation mechanism for misaligned systems (2017)
  • Author(s): Tomoaki Matsumoto; Masahiro, N. Machida; Shu-Ichiro Inutsuka
  • Journal Title: The Astrophysical Journal Volume: 839(1) Issue: 1 Pages: 69-69
  • DOI: 10.3847/1538-4357/aa6a1c
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] First results from BISTRO -- a SCUBA-2 polarimeter survey of the Gould Belt (2017)
  • Author(s): Derek Ward-Thompson他
  • Journal Title: The Astrophysical Journal Volume: -
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Massive Outflows Driven by Magnetic Effects in Star Forming Clouds with High Mass Accretion Rates (2017)
  • Author(s): Yuko Matsushita, Masahiro N. Machida, Yuya Sakurai, Takashi Hosokawa
  • Journal Title: Monthly Notices Royal Astronomical Society Volume: -
  • Peer Reviewed
• [Journal Article] Conditions for circumstellar disc formation - II. Effects of initial cloud stability and mass accretion rate (2016)
  • Author(s): Machida, Masahiro N.; Matsumoto, Tomoaki; Inutsuka, Shu-ichiro
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 463(4) Issue: 4 Pages: 4246-4267
  • DOI: 10.1093/mnras/stw2256
  • Peer Reviewed
• [Journal Article] Accretion phase of star formation in clouds with different metallicities (2015)
  • Author(s): Machida, Masahiro N.; Nakamura, Teppei
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 448 Issue: 2 Pages: 1405-1429
  • DOI: 10.1093/mnras/stu2633
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Polarization Structure of Filamentary Clouds (2015)
  • Author(s): Tomisaka, Kohji
  • Journal Title: Astrophysical Journal Volume: 807 Issue: 1 Pages: 47-47
  • DOI: 10.1088/0004-637x/807/1/47
  • Peer Reviewed
• [Journal Article] ALMA Observations of the Transition from Infall Motion to Keplerian Rotation around the Late-phase Protostar TMC-1A (2015)
  • Author(s): Aso, Yusuke; Aso, Yusuke; Ohashi, Nagayoshi; Saigo, Kazuya; Koyamatsu, Shin; Aikawa, Yuri; Hayashi, Masahiko; Machida, Masahiro N.; Saito, Masao; Takakuwa, Shigehisa; Tomida, Kengo; Tomisaka, Kohji; Yen, Hsi-Wei
  • Journal Title: Astrophysical Journal Volume: 812 Issue: 1 Pages: 27-27
  • DOI: 10.1088/0004-637x/812/1/27
  • Peer Reviewed / Int'l Joint Research
• [Presentation] グロビュールの砂時計型磁場構造の探査 (2018)
  • Author(s): 神鳥亮 , 田村元秀, 富阪幸治, 齋藤正雄, 立松健一, IRSF/SIRPOL チーム
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] Class 0 天体 MMS5 から駆動するアウトフローとジェットの軸のずれ (2018)
  • Author(s): 松下祐子, 高橋智子, 町田正博, 富阪幸治
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] 円盤形成におけるホール効果の影響：ダストサイズ分布と宇宙線強度依存性 (2018)
  • Author(s): 古賀駿大, 塚本裕介, 奥住聡, 町田正博
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] 銀河系ハローにおける超金属欠乏炭素過剰星の起源と星・連星系形成史 (2018)
  • Author(s): 山田志真子, 須田拓馬 , 小宮悠, 町田正博, 藤本正行
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] 3 次元モンテカルロ輻射輸送計算によるCircinus galaxy の分子ガス構造の解明 (2017)
  • Author(s): 福重亮佑、和田桂一、泉拓磨、富阪幸治
  • Organizer: 日本天文学会2017年度春季年会
  • Place of Presentation: 九州大学（福岡県・福岡市）
  • Year and Date: 2017-03-15
• [Presentation] 垂直な磁場に貫かれたフィラメント状分子雲のJeans 不安定 (2017)
  • Author(s): 花輪知幸, 工藤哲洋, 富阪幸治
  • Organizer: 日本天文学会2017年度春季年会
  • Place of Presentation: 九州大学（福岡県・福岡市）
  • Year and Date: 2017-03-15
• [Presentation] 磁場に垂直に貫かれたフィラメント状星間雲の動的収縮 (2017)
  • Author(s): 富阪幸治、松本倫明
  • Organizer: 日本天文学会2017年度春季年会
  • Place of Presentation: 九州大学（福岡県・福岡市）
  • Year and Date: 2017-03-15
• [Presentation] ALMA Cycle 2/3 のよるClass I 原始星L1489 IRS の観測 (2017)
  • Author(s): 崔仁士，大橋永芳，齋藤正雄，西合一矢，麻生有佑，Hsi-Wei Yen，高桑繁久，相川祐里，富阪幸治，町田正博，富田賢吾，小屋松進
  • Organizer: 日本天文学会2017年度春季年会
  • Place of Presentation: 九州大学（福岡県・福岡市）
  • Year and Date: 2017-03-15
• [Presentation] ALMA望遠鏡を用いたオリオン座分子雲中の原始星(Class I 天体) 周囲の回転 構造の研究 (2017)
  • Author(s): 西海拓, 高橋智子, Edward B. Fomalont, 富阪幸治, 町田正博, 中西康一郎
  • Organizer: 日本天文学会2017年度春季年会
  • Place of Presentation: 九州大学（福岡県・福岡市）
  • Year and Date: 2017-03-15
• [Presentation] 乱流による実効的な圧力を考慮したフィラメントモデルの安定性 (2017)
  • Author(s): 花輪知幸，工藤哲洋， 富阪幸治
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] 中間質量星形成領域 OMC-3 MMS5 に付随する EHV アウトフロー (2017)
  • Author(s): 松下祐子, 高橋智子, 町田正博, 富阪幸治
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] Serpens Main の ALMA Cycle 3 観測：ミリ波で見る進化段階 (2017)
  • Author(s): 麻生有佑 , 平野尚美, 大橋永芳 , 西合一矢 , 齋藤正雄, 富阪幸治, 相川祐理, 高桑繁久, 富田賢吾, 町田正博, YEN Hsi-Wei, Jonathan P. WILLIAMS
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] 磁場に貫かれたフィラメント状分子雲の自己重力不安定性：線形解析と数値 シミュレーションとの比較 (2017)
  • Author(s): 工藤哲洋，花輪知幸，富阪幸治
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] ALMA による Class I 原始星 L1489 IRS の観測 II: 歪んだ円盤構造 (2017)
  • Author(s): 崔仁士, 大橋永芳, 西合一矢, 松本倫明, 高桑繁久, 齋藤正雄, 麻生有佑 , 相川祐理 , 黒瀬一平, Hsi-Wei Yen, 富阪幸治, 富田賢吾, 町田正博
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] 低金属量環境における星形成過程 (2017)
  • Author(s): 樋口公紀 , 町田正博, 須佐元
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] 炭素過剰超金属欠乏星と宇宙初期における星・連星系形成史 (2017)
  • Author(s): 藤本正行, 山田志真子, 須田拓馬 , 小宮悠, 町田正博
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] 動き始めたBISTRO：JCMT搭載サブミリ波偏波計POL-2 を用いた星形 成領域の網羅的観測の現状 (2016)
  • Author(s): 古屋玲他
  • Organizer: 日本天文学会2016年度秋季年会
  • Place of Presentation: 愛媛大学（愛媛県・松山市）
  • Year and Date: 2016-09-14
• [Presentation] 磁場に貫かれたフィラメント状分子雲の不安定性 (2016)
  • Author(s): 工藤哲洋，富阪幸治，花輪知幸
  • Organizer: 日本天文学会2016年度秋季年会
  • Place of Presentation: 愛媛大学（愛媛県・松山市）
  • Year and Date: 2016-09-14
• [Presentation] ALMA Cycle 1 による原始星L1448-mmの観測 (2016)
  • Author(s): 黒瀬一平、大橋永芳、麻生有佑、西合一矢、Hsi-Wei Yen, 高桑繁久、相川祐理、富阪幸治、斉藤正雄、林正彦、深川美里、町田正博、富田賢吾
  • Organizer: 日本天文学会2016年春季年会
  • Place of Presentation: 首都大学東京（東京都八王子市）
  • Year and Date: 2016-03-14
• [Presentation] 原始星L1527 IRS 周囲のダストとガスの構造 (2016)
  • Author(s): 麻生有佑、大橋永芳、相川祐理、西合一矢、斎藤正雄、富阪幸治、高桑繁久、Hsi-Wei Yen、富田賢吾、町田正博
  • Organizer: 日本天文学会2016年春季年会
  • Place of Presentation: 首都大学東京（東京都八王子市）
  • Year and Date: 2016-03-14
• [Presentation] 磁場と回転の効果による円盤の方向の空間依存性 (2015)
  • Author(s): 町田正博
  • Organizer: 日本天文学会2015年秋季年会
  • Place of Presentation: 甲南大学（兵庫県神戸市）
  • Year and Date: 2015-09-10