An observational study of the Magnetically floating loops in the Galactic center

• Project/Area Number: 23740149
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: Nagoya University
• Principal Investigator: TORII KAZUFUMI 名古屋大学, 理学(系)研究科(研究院), 研究員 (20444383)
• Project Period (FY): 2011 – 2013
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2011: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 銀河系中心部 / 電波天文学 / 磁気流体力学 / 星間物理学 / 国際研究者交流 アメリカ / 星間物質 / 磁場 / 国際研究者交流

Research Abstract

The present study aims to establish the understanding of the Galactic center magnetically floating loops. We carried out detailed and large scale molecular observations toward the Galactic center to identify individual magnetic loops, resulting discoveries of a dozen new loops, many vertically elongated filaments and molecular halo. In addition, we found the molecular counterparts of the Double Helix Nebula likely supported by the strong magnetic field, using the observed data sets, and discussed that the DHN was formed as the result of the magnetic jet emitted from the super massive black hole in the Galactic center "Sgr A*". The impacts on the surrounding medium by the magnetic loops were also studied; e.g., Destructive effects on the small scale grains, and acceleration of the cosmic-ray proton by the second order of the Fermi acceleration, strongly indicating that the magnetically floating loops provide significant impacts on the environment and evolution of the Galactic center.

Research Products

• [Journal Article] Detailed molecular observations toward the Double Helix Nebula (2014)
  • Author(s): Kazufumi TORII, et al
  • Journal Title: ApJ Volume: (印刷中)
  • Peer Reviewed
• [Journal Article] Discovery of possible molecular counterparts to the infrared Double Helix Nebula in the Galactic center (2014)
  • Author(s): Enokiya, R., et al.
  • Journal Title: The Astrophysical Journal Volume: 780 Issue: 1 Pages: 72-90
  • DOI: 10.1088/0004-637x/780/1/72
  • Peer Reviewed
• [Journal Article] Molecular Clouds toward the Super Star Cluster NGC 3603 Possible Evidence for a Cloud-Cloud Collision in Triggering the Cluster Formation (2014)
  • Author(s): Fukui, Y., Ohama, A., Hanaoka, N., Furukawa, N., Torii, K., Dawson, J. R., Mizuno, N., Hasegawa, K., Fukuda, T., Soga, S., Moribe, N., Kuroda, Y., Hayakawa, T., Kawamura, A., Kuwahara, T., Yamamoto, H., Okuda, T., Onishi, T., Maezawa, H., and Mizuno, A.
  • Journal Title: The Astrophysical Journal Volume: 780 Issue: 1 Pages: 36-36
  • DOI: 10.1088/0004-637x/780/1/36
  • Peer Reviewed
• [Journal Article] The Jet and Arc Molecular Clouds toward Westerlund 2, RCW 49, and HESS J1023-575 12CO and 13CO (J=2-1 and J=1-0) observations with NANTEN2 and Mopra Telescope (2014)
  • Author(s): Furukawa, N., et al.
  • Journal Title: The Astrophysical Journal Volume: 781 Issue: 2 Pages: 70-89
  • DOI: 10.1088/0004-637x/781/2/70
  • Peer Reviewed
• [Journal Article] Detailed molecular observations toward the Double Helix Nebula (2014)
  • Author(s): Torii, K., Enokiya, R., Morris, M. R., Hasegawa, K., Kudo, N., Fukui, Y.
  • Journal Title: The Astrophysical Journal Supplement Volume: 2013
  • Peer Reviewed
• [Journal Article] The Neutral Interstellar Gas toward SNR W44 : Candidates for Target Protons in Hadronic γ-Ray Production in a Middle-aged Supernova Remnant (2013)
  • Author(s): 吉池智史
  • Journal Title: The Astrophysical Journal Volume: 768 Issue: 2 Pages: 1-10
  • DOI: 10.1088/0004-637x/768/2/179
  • Peer Reviewed
• [Journal Article] Large-scale mapping of the massive star-forming region RCW 38 in the [CII] and PAH emission (2013)
  • Author(s): H. Kaneda
  • Journal Title: Astronomy & Astrophysics Volume: 556 Pages: 92-100
  • DOI: 10.1051/0004-6361/201321614
  • Peer Reviewed
• [Journal Article] Non-thermal X-rays and interstellar gas toward the y-ray supernova remnant RX J1713.7-3946 : Evidence for X-ray enhancement around CO and HI clumps The Astrophysical Journal' (2013)
  • Author(s): Sano, H., et al.
  • Journal Title: The Astrophysical Journal Volume: 778 Issue: 1 Pages: 59-77
  • DOI: 10.1088/0004-637x/778/1/59
  • Peer Reviewed
• [Journal Article] Introducing the CTA concept (2013)
  • Author(s): Acharya, et al.
  • Journal Title: Astroparticle Physics Volume: 43 Pages: 3-18
  • DOI: 10.1016/j.astropartphys.2013.01.007
  • Peer Reviewed
• [Journal Article] Molecular and Atomic Gas toward HESS J1745-303 in the Galactic Center : Further Support for the Hadronic Scenario (2012)
  • Author(s): Takahiro HAYAKAWA, Kazufumi TORII, Rei ENOKIYA, Takanobu AMANO, Yasuo FUKUI
  • Journal Title: ApJ Volume: 64 Issue: 1 Pages: 8-8
  • DOI: 10.1093/pasj/64.1.8
  • NAID: 10030386082
  • Year and Date: 2012-02-25
  • Peer Reviewed
• [Journal Article] Processing of polycyclic aromatic hydrocarbons in molecular-loop regions near the Galactic center revealed by AKARI (2012)
  • Author(s): H. Kaneda, D. Ishihara, A. Mouri, S. Oyabu, M. Yamagishi, T. Kondo, T. Onaka, Y. Fukui, A. Kawamura, K. Torii
  • Journal Title: Publications of the Astronomical Society of Japan Volume: Vol. 64 Issue: 2 Pages: 25-25
  • DOI: 10.1093/pasj/64.2.25
  • NAID: 10030747513
  • Peer Reviewed
• [Journal Article] Processing of Polycyclic Aromatic Hydrocarbons in Molecular-Loop Regions near the Galactic Center Revealed by AKARI (2012)
  • Author(s): Kaneda, Hidehiro; Ishihara, Daisuke; Mouri, Akio; Oyabu, Shinki; Yamagishi, Mitsuyoshi; Kondo, Toru; Onaka, Takashi; Fukui, Yasuo; Kawamura, Akiko; Torii, Kazufumi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 64 Pages: 25-33
  • NAID: 10030747513
  • Peer Reviewed
• [Journal Article] Dark gas : a new possible link between low and high-energy phenomena (2012)
  • Author(s): 鳥居和史
  • Journal Title: The Spectral Energy Distribution of Galaxies, Proceedings of the International Astronomical Union, IAU Symposium Volume: 284 Issue: S284 Pages: 389-392
  • DOI: 10.1017/s1743921312009477
  • Peer Reviewed
• [Journal Article] Molecular and Atomic Gas toward HESS J1745-303 in the Galactic Center: Further Support for the Hadronic Scenario (2012)
  • Author(s): Takahiro Hayakawa, Kazufumi Torii, Rei Enokiya, Takanobu Amano, Yasuo Fukui
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 64 Pages: 8-14
  • NAID: 10030386082
  • Peer Reviewed
• [Journal Article] A Detailed Study of the Molecular and Atomic Gas toward the γ-Ray Supernova Remnant RX J1713.7-3946 : Spatial TeV γ-Ray and Interstellar Medium Gas Correspondence (2012)
  • Author(s): Fukui, Y., et al
  • Journal Title: The Astrophysical Journal Volume: 746 Issue: 1 Pages: 82-82
  • DOI: 10.1088/0004-637x/746/1/82
  • Peer Reviewed
• [Journal Article] Processing of polycyclic aromatic hydrocarbons in molecular-loop regions near the Galactic Center revealed by AKARI (2012)
  • Author(s): Hidehiro Kaneda et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 64
  • Peer Reviewed
• [Journal Article] Stochastic Acceleration of Cosmic Rays in the Central Molecular Zone of the Galaxy (2011)
  • Author(s): Takanobu AMANO, Kazufumi TORII, Takahiro HAYAKAWA, Yasuo FUKUI
  • Journal Title: PASJ Volume: 63L Issue: 6 Pages: 63-63
  • DOI: 10.1093/pasj/63.6.l63
  • NAID: 10030385043
  • Year and Date: 2011-12-25
  • Peer Reviewed
• [Journal Article] Molecular Clouds in the Trifid Nebula M20 : Possible Evidence for a Cloud-Cloud Collision in Triggering the Formation of the First Generation Stars (2011)
  • Author(s): 鳥居和史
  • Journal Title: The Astrophysical Journal Volume: 738 Issue: 1 Pages: 46-46
  • DOI: 10.1088/0004-637x/738/1/46
  • Peer Reviewed
• [Journal Article] Molecular Loops in the Galactic Center : Detailed Observations of the Footpoint of the Loops (2011)
  • Author(s): Kazufumi TORII, Yasuo FUKUI, Natsuko KUDO, et al
  • Journal Title: Proceedings of a workshop held at Shanghai (2009. Edited by Mark R. Morris, Q. Daniel Wang, and Feng Yuan. San Francisco : Astronomical Society of the Pacific) Pages: 71-71
• [Journal Article] Stochastic Acceleration of Cosmic Rays in the Central Molecular Zone of the Galaxy (2011)
  • Author(s): Takanobu Amano, Kazufumi Torii, Takahiro Hayakawa, Yasuo Fukui
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 63 Pages: 63-66
  • NAID: 10030385043
  • Peer Reviewed
• [Journal Article] Neutral Pion Emission from Accelerated Protons in the Supernova Remnant W44 (2011)
  • Author(s): Giuliani, A., et al
  • Journal Title: The Astrophysical Journal Letters Volume: 742 Issue: 2 Pages: 30-35
  • DOI: 10.1088/2041-8205/742/2/l30
  • Peer Reviewed
• [Presentation] High mass star formation in M20 triggered by cloud-cloud collisions (2014)
  • Author(s): Kazufumi TORII, et al
  • Organizer: The Impact of Galactic Structure on Star Formation
  • Place of Presentation: Sapporo, Japan
• [Presentation] 銀河系中心部いて座A 領 域南の高銀緯・高速度分子雲の発見" (2014)
  • Author(s): 鳥居和史, 他
  • Organizer: 日本天文学会2014年春季年会
  • Place of Presentation: 国際基督教大学
• [Presentation] 銀河系中心部銀経正方向の分子雲ループ探査 (2014)
  • Author(s): 臼井僚, 古橋絵利, 榎谷玲依, 鳥居和史, 他
  • Organizer: 日本天文学会2014年春季年会
  • Place of Presentation: 国際基督教大学
• [Presentation] 銀河系中心部いて座A 領域南の高銀緯・高速度分子雲の発見 (2014)
  • Author(s): 榎谷玲依, 鳥居和史, 他
  • Organizer: 日本天文学会2014年春季年会
  • Place of Presentation: 国際基督教大学
• [Presentation] High mass star formation in M20 triggered by cloud-cloud collisions (2014)
  • Author(s): 鳥居和史
  • Organizer: The Impact of Galactic Structure on Star Formation 2014
  • Place of Presentation: 北海道, 日本
• [Presentation] Mopra望遠鏡を用いたHII領域RCW 120に対するCO輝線観測：分子雲衝突による大質量星形成 (2014)
  • Author(s): 鳥居和史
  • Organizer: 日本天文学会2014年春季年会
  • Place of Presentation: 東京, 日本
• [Presentation] 銀河系中心部銀経正方向の分子雲ループ探査 (2014)
  • Author(s): 臼井僚
  • Organizer: 日本天文学会2014年春季年会
  • Place of Presentation: 東京, 日本
• [Presentation] 銀河系中心部いて座A領域南の高銀緯・高速度分子雲の発見 (2014)
  • Author(s): 榎谷玲依
  • Organizer: 日本天文学会2014年春季年会
  • Place of Presentation: 東京, 日本
• [Presentation] Detailed Distributions of the CO J=2-1/J=1-0 Intensity Ratios towards a Large Area of the Central Molecular Zone (2013)
  • Author(s): Kazufumi TORII, et al
  • Organizer: IAU 303 Symposium - The Galactic Center : Feeding and Feedback in a Normal Galactic Nucleus
  • Place of Presentation: Santa Fe, USA
• [Presentation] High mass star formation in M20 triggered by cloud-cloud collision (2013)
  • Author(s): Kazufumi TORII, et al
  • Organizer: The National Astronomy Meeting of the Royal Astronomical Society
  • Place of Presentation: St. Andrews, UK
• [Presentation] A new CO survey of the nearby galaxies with NANTEN2 (2013)
  • Author(s): Kazufumi TORII, et al
  • Organizer: The National Astronomy Meeting of the Royal Astronomical Society
  • Place of Presentation: St. Andrews, UK
• [Presentation] NANTEN2 の広域観測による Central Molecular Zone の詳細解析3 (2013)
  • Author(s): 榎谷玲依, 鳥居和史, 他
  • Organizer: 日本天文学会2013年秋季年会
  • Place of Presentation: 東北大学
• [Presentation] NANTEN2 の広域観測による Central Molecular Zone の詳細解析2 (2013)
  • Author(s): 榎谷玲依, 鳥居和史, 他
  • Organizer: 日本天文学会2013年春季年会
  • Place of Presentation: 埼玉大学
• [Presentation] High mass star formation in M20 triggered by cloud-cloud collision (2013)
  • Author(s): 鳥居和史
  • Organizer: National Astronomy Meeting 2013
  • Place of Presentation: St. Andrews, UK
• [Presentation] Detailed Distributions of the CO J=2-1/J=1-0 Intensity Ratios towards a Large Area of the Central Molecular Zone (2013)
  • Author(s): 鳥居和史
  • Organizer: The Galactic Center: Feeding and Feedback in a Normal Galactic Nucleus
  • Place of Presentation: Santa Fe, USA
• [Presentation] 銀河系中心部の分子雲ループと分子雲衝突 (2013)
  • Author(s): 鳥居和史
  • Organizer: ALMA銀中Wokshop 2013
  • Place of Presentation: 神奈川, 日本
• [Presentation] Molecular Observations toward Infrared Filaments in the Galactic Centre (2013)
  • Author(s): Kazufumi Torii
  • Organizer: Dust mini-workshop
  • Place of Presentation: University of Oxford
• [Presentation] NANTEN2の広域観測による Central Molecular Zone の詳細解析 (2013)
  • Author(s): 榎谷玲依, 鳥居和史, 他
  • Organizer: 日本天文学会2013年春季年会
  • Place of Presentation: 埼玉大学
• [Presentation] Molecular observations of the Spitzer bubbles : High-mass star formation via cloud-cloud collision (2012)
  • Author(s): Kazufumi TORII, et al
  • Organizer: Workshop "Cloud collisions and triggered high-mass star formation"
  • Place of Presentation: Nagoya University, Japan
• [Presentation] 分子雲衝突によって誘発された大質量星形成1 : 全体像 (2012)
  • Author(s): 鳥居和史, 他
  • Organizer: 日本天文学会2012年秋季年会
  • Place of Presentation: 大分大学
• [Presentation] NANTEN2 を用いた銀河面サーベイ計画 (2012)
  • Author(s): 鳥居和史, 他
  • Organizer: 天の川銀河研究会
• [Presentation] NANTEN2 の広域観測による Central Molecular Zone の詳細解析 (2012)
  • Author(s): 榎谷玲依, 鳥居和史, 他
  • Organizer: 日本天文学会2012年秋季年会
  • Place of Presentation: 大分大学
• [Presentation] 三裂星雲M20 に付随する分子雲 : 分子雲衝突による大質量星形成 (2012)
  • Author(s): 鳥居和史, 他
  • Organizer: 日本天文学会2012年春季年会
  • Place of Presentation: 龍谷大学
• [Presentation] 銀河系中心部のDouble Helix Nebula に付随する分子雲の発見2 (2012)
  • Author(s): 榎谷玲依, 鳥居和史, 他
  • Organizer: 日本天文学会2012年春季年会
  • Place of Presentation: 龍谷大学
• [Presentation] NANTEN2を用いた銀河面サーベイ計画 (2012)
  • Author(s): 鳥居和史
  • Organizer: 天の川銀河研究会
  • Place of Presentation: 鹿児島大学
• [Presentation] 分子雲衝突によって誘発された大質量星形成1：全体像 (2012)
  • Author(s): 鳥居和史
  • Organizer: 日本天文学会2012年秋季年会
  • Place of Presentation: 大分大学
• [Presentation] Molecular observations of the Spitzer bubbles: High-mass star formation via cloud-cloud collision (2012)
  • Author(s): Kazufumi Torii
  • Organizer: Workshop "Cloud collisions and triggered high-mass star formation"
  • Place of Presentation: Nagoya University
• [Presentation] Statistics of CO clouds in Spitzer bubbles (2012)
  • Author(s): Kazufumi Torii
  • Organizer: Workshop "Cloud collisions and triggered high-mass star formation"
  • Place of Presentation: Hokkaido University
• [Presentation] NANTEN2の広域観測による Central Molecular Zone の詳細解析II (2012)
  • Author(s): 榎谷玲依, 鳥居和史, 他
  • Organizer: 日本天文学会2012年秋季年会
  • Place of Presentation: 大分大学
• [Presentation] 三裂星雲M20に付随する分子雲：分子雲衝突による大質量星形成 (2012)
  • Author(s): 鳥居和史
  • Organizer: 日本天文学会2012年春季年会
  • Place of Presentation: 龍谷大学
• [Presentation] Triggered star formation via cloud-cloud collision (2011)
  • Author(s): Kazufumi TORII, et al
  • Organizer: Global COE program "Quest for Fundamental Principles in the Universe" Annual Meeting
  • Place of Presentation: Nagoya University, Japan
• [Presentation] Large scale sensitive CO observations of the CMZ with NANTEN2 (2011)
  • Author(s): Kazufumi TORII, et al
  • Organizer: The Emerging, Multi-wavelength Picture of the Galactic Centre Environment
  • Place of Presentation: Max-Planck Haus, Germany
• [Presentation] Dark Gas : A New Possible Link Between Low And High-Energy Phenomena (2011)
  • Author(s): Kazufumi TORII, et al
  • Organizer: IAU Symposium 284 : SED2011
  • Place of Presentation: the University of Central Lancashire, UK
• [Presentation] 銀河系中心CMZ のTeVγ線天体と分子雲・原子雲の比較 (2011)
  • Author(s): 早川貴敬, 鳥居和史, 他
  • Organizer: 日本天文学会2011年秋季年会
  • Place of Presentation: 鹿児島大学
• [Presentation] 銀河系中心部のDouble Helix Nebula に付随する分子雲の発見 (2011)
  • Author(s): 榎谷玲依, 鳥居和史, 他
  • Organizer: 日本天文学会2011年秋季年会
  • Place of Presentation: 鹿児島大学
• [Presentation] Large scale sensitive CO observations of the CMZ with NANTEN2 (2011)
  • Author(s): Kazufumi Torii
  • Organizer: The Emerging, Multi-wavelength Picture of the Galactic Centre Environment
  • Place of Presentation: ドイツ、ハイデルベルク
• [Presentation] Dark Gas: A New Possible Link Between Low And High-Energy Phenomena (2011)
  • Author(s): Kazufumi Torii
  • Organizer: IAU Symposium 284: SED2011
  • Place of Presentation: イギリス、セントラルランカシャー大学
• [Presentation] NANTEN2 Super CO Survey 計画 Planck を用いたBモード偏波の検出に向けてその２：計画の現状 (2011)
  • Author(s): 鳥居和史
  • Organizer: 日本物理学会2011年秋季年会
  • Place of Presentation: 弘前大学
• [Presentation] Spitzer bubbleと分子雲衝突の関係
  • Author(s): 鳥居和史
  • Organizer: NRO銀河面サーベイワークショップ -- ALMAを見据えたサイエンス検討 --
  • Place of Presentation: 東京, 日本
• [Book] 宇宙100の謎２ (2012)
  • Author(s): 福井康雄
  • Total Pages: 223
  • Publisher: 東京新聞出版局