Observational Study of Helically Moving HI Gas and the Galactic Magnetic Field

• Project/Area Number: 26800104
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: Kagoshima University
• Principal Investigator: Nakanishi Hiroyuki 鹿児島大学, 理工学域理学系, 准教授 (90419846)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 銀河系 / 宇宙磁場 / 中性水素原子ガス / 電波天文学

Outline of Final Research Achievements

We searched for helically moving HI clouds using Galactic All Sky Survey data obtained with Parkes 64m telescope in Australia in order to examine if the Galactic magnetic field is amplified with Galactic dynamo process. As a result, we found that they can be explained as magnetically floating loops and the emerging rate is comparable to a predicted value by the Galactic dynamo hypothesis. We developed an HI observation system for JAXA Usuda 64-m telescope to conduct high-velocity resolution observation for a helically moving HI cloud.

Research Products

• [Int'l Joint Research] Australian National University(オーストラリア)
• [Journal Article] Three-dimensional distribution of the ISM in the Milky Way galaxy. III. The total neutral gas disk (2016)
  • Author(s): H. Nakanishi & Y. Sofue
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68 Issue: 1 Pages: 5-5
  • DOI: 10.1093/pasj/psv108
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Sensitivity for 21cm Bispectrum from Epoch of Reionization (2015)
  • Author(s): Shintaro Yoshiura, Hayato Shimabukuro, Keitaro Takahashi, Rieko Momose, Hiroyuki Nakanishi and Hiroshi Imai,
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 451 Issue: 1 Pages: 266-274
  • DOI: 10.1093/mnras/stv855
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Outer Rotation Curve of the Galaxy with VERA II: Annual Parallax and Proper Motion of the Star-Forming Region IRAS21379+5106 (2015)
  • Author(s): Hiroyuki Nakanishi, Nobuyuki Sakai, Tomoharu Kurayama, Mitsuhiro Matsuo, Hiroshi Imai, Ross A. Burns, Takeaki Ozawa, Mareki Honma, Katsunori Shibata,& Noriyuki Kawaguchi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 4 Pages: 13-13
  • DOI: 10.1093/pasj/psv012
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Outer rotation curve of the Galaxy with VERA. III. Astrometry of IRAS 07427-2400 and test of the density-wave theory (2015)
  • Author(s): N. Sakai, H. Nakanishi, M. Matsuo, N. Koide, D. Tezuka, T. Kurayama, K.M. Shibata, Y. Ueno, & M. Honma
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 4 Pages: 69-69
  • DOI: 10.1093/pasj/psv049
  • Peer Reviewed
• [Journal Article] Trigonometric Distance and Proper Motion of IRAS 20056+3350: a Massive Star Forming Region on the Solar Circle (2015)
  • Author(s): R.A.Burns, T. Nagayama, T. Handa, T. Omodaka, A. Nakagawa, H. Nakanishi, M. Hayashi, & M. Shizugami
  • Journal Title: Publications of The Korean Astronomical Society Volume: 30 Issue: 2 Pages: 121-121
  • DOI: 10.5303/pkas.2015.30.2.121
  • Peer Reviewed
• [Journal Article] JVLA S- and X-band polarimetry of the merging cluster Abell 2256 (2015)
  • Author(s): Takeaki Ozawa, Hiroyuki Nakanishi, Takuya Akahori, Kenta Anraku, Motokazu Takizawa, Ikumi Takahashi, Sachiko Onodera, Yuya Tsuda, Yoshiaki Sofue
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 6 Pages: 110-110
  • DOI: 10.1093/pasj/psv082
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Trigonometric parallax of IRAS 22555+6213 with VERA: Three-dimensional view of sources along the same line of sight (2014)
  • Author(s): James O. Chibueze, Hirofumi Sakanoue, Takumi Nagayama, Toshihiro Omodaka, Toshihiro Handa, Tatsuya Kamezaki, Ross A. Burns, Hideyuki Kobayashi, Hiroyuki Nakanishi, Mareki Honma, Yuji Ueno, Tomoharu Kurayama, Mitsuhiro Matsuo,& Nobuyuki Sakai
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 66 Issue: 6 Pages: 104-104
  • DOI: 10.1093/pasj/psu106
  • Peer Reviewed
• [Journal Article] Trigonometric Distance and Proper Motion of Iras 20056+3350: A Massive Star-forming Region on the solar Circle (2014)
  • Author(s): Ross A. Burns, Takumi Nagayama, Toshihiro Handa, Toshihiro Omodaka, Akiharu Nakagawa, Hiroyuki Nakanishi, Masahiko Hayashi,& Makoto Shizugami
  • Journal Title: The Astrophysical Journal Volume: 797 Issue: 1 Pages: 39-39
  • DOI: 10.1088/0004-637x/797/1/39
  • Peer Reviewed
• [Journal Article] Phase transition between atomic and molecular hydrogen in nearby spiral galaxies (2014)
  • Author(s): Ayako Tanaka, Hiroyuki Nakanishi, Nario Kuno,& Akihiko Hirota
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 66 Issue: 3 Pages: 66-66
  • DOI: 10.1093/pasj/psu039
  • NAID: 40020140552
  • Peer Reviewed
• [Presentation] Helically moving HI cloud found in the outer Galactic disk (2016)
  • Author(s): H. Nakanishi, N. McClure-Griffiths, C. Saita, & M. Machida
  • Organizer: 日本天文学会春期年会
  • Place of Presentation: 首都大学東京（東京都八王子市）
  • Year and Date: 2016-03-15
• [Presentation] 可視・電波観測で探る銀河・銀河系の構造 (2016)
  • Author(s): 中西裕之
  • Organizer: 第6回インターネット望遠鏡プロジェクトシンポジウム
  • Place of Presentation: 慶応大学日吉キャンパス（神奈川県横浜市）
  • Year and Date: 2016-02-20
  • Invited
• [Presentation] Galaxy Evolution with SKA (2015)
  • Author(s): H. Nakanishi
  • Organizer: ALPACA Workshop
  • Place of Presentation: 国立天文台（東京都三鷹市）
  • Year and Date: 2015-12-03
  • Int'l Joint Research / Invited
• [Presentation] Helically Moving HI Cloud (2015)
  • Author(s): H. Nakanishi, N. McClure-Griffiths, C. Saita, & M. Machida
  • Organizer: SKAサイエンス会議 宇宙磁場2015
  • Place of Presentation: 鹿児島大学（鹿児島県鹿児島市）
  • Year and Date: 2015-09-18
• [Presentation] 螺旋運動するHIガス雲の観測的研究 (2015)
  • Author(s): H. Nakanishi, N. McClure-Griffiths, C. Saita, & M. Machida
  • Organizer: 第18 回九州地区宇宙物理学合同セミナー
  • Place of Presentation: 九州地区国立大学九重共同研修所（大分県玖珠郡九重町）
  • Year and Date: 2015-09-03
• [Presentation] Molecular fraction of gaseous disk of nearby spiral galaxies (2015)
  • Author(s): Hiroyuki Nakanishi
  • Organizer: Nagoya Workshop on the Interstellar Hydrogen
  • Place of Presentation: Nadya Park, Sakae, Nagoya
  • Year and Date: 2015-03-26 – 2015-03-28
• [Presentation] 臼田宇宙空間観測所64m電波望遠鏡による中性水素原子ガス21cm線の観測 (2014)
  • Author(s): 中西裕之, 齊田智恵(鹿児島大学), 村田泰宏, 坪井昌人(宇宙科学研究所), 米倉覚則(茨城大学), 土橋一仁(東京学芸大学), ほか臼田64m鏡ライン観測WGメンバー
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 山形大学（山形県山形市）
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] SKA時代に向けた45m鏡への期待 (2014)
  • Author(s): 中西裕之
  • Organizer: 野辺山ユーザーズミーティング
  • Place of Presentation: 国立天文台野辺山宇宙電波観測所（長野県南佐久郡南牧村）
  • Year and Date: 2014-07-23 – 2014-07-24