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Revealing the origin of dark gas around molecular clouds using the velocity-dispersion method

Research Project

Project/Area Number 26287030
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypePartial Multi-year Fund
Section一般
Research Field Astronomy
Research InstitutionTokyo Gakugei University

Principal Investigator

DOBASHI Kazuhito  東京学芸大学, 教育学部, 教授 (20237176)

Co-Investigator(Kenkyū-buntansha) 前澤 裕之  大阪府立大学, 理学(系)研究科(研究院), 准教授 (00377780)
松本 倫明  法政大学, 人間環境学部, 教授 (60308004)
村田 泰宏  国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 准教授 (70249936)
中西 裕之  鹿児島大学, 理工学域理学系, 准教授 (90419846)
井上 剛志  名古屋大学, 理学研究科, 准教授 (90531294)
Project Period (FY) 2014-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2016: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2015: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2014: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Keywords電波天文学 / データベース天文学
Outline of Final Research Achievements

The purpose of our study is to quantify the components of “dark gas”. The dark gas is the gas which can be detected by the far-infrared dust emission or by gamma-ray, but cannot be traced by the HI 21cm line nor CO emission lines, and it is known to be abundant around dense molecular clouds. The origin of the dark gas should be either optically thick cold HI gas or diffuse molecular gas (H2) which cannot form or excite CO molecules. Using the new method that we named “velocity-dispersion method”, we analyzed the 21cm and CO emission lines around the Taurus molecular cloud, and found that the fraction of the cold HI gas in the dark gas is about 20%, and therefore the rest (~80%) of the dark gas should be the diffuse molecular gas without CO emission.

Report

(5 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Annual Research Report
  • 2015 Annual Research Report
  • 2014 Annual Research Report
  • Research Products

    (38 results)

All 2018 2017 2016 2015 2014 Other

All Int'l Joint Research (1 results) Journal Article (14 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 14 results,  Open Access: 6 results,  Acknowledgement Compliant: 7 results) Presentation (23 results)

  • [Int'l Joint Research] IRAP(Toulouse)(France)

    • Related Report
      2015 Annual Research Report
  • [Journal Article] A Statistical Study of Massive Cluster-forming Clumps2018

    • Author(s)
      Shimoikura Tomomi、Dobashi Kazuhito、Nakamura Fumitaka、Matsumoto Tomoaki、Hirota Tomoya
    • Journal Title

      The Astrophysical Journal

      Volume: 855 Issue: 1 Pages: 45-45

    • DOI

      10.3847/1538-4357/aaaccd

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Observations of Cyanopolyynes toward Four High-mass Star-forming Regions Containing Hot Cores2017

    • Author(s)
      Taniguchi Kotomi、Saito Masao、Hirota Tomoya、Ozeki Hiroyuki、Miyamoto Yusuke、Kaneko Hiroyuki、Minamidani Tetsuhiro、Shimoikura Tomomi、Nakamura Fumitaka、Dobashi Kazuhito
    • Journal Title

      The Astrophysical Journal

      Volume: 844 Issue: 1 Pages: 68-68

    • DOI

      10.3847/1538-4357/aa7899

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Correlation of gas dynamics and dust in the evolved filament G82.65-02.002017

    • Author(s)
      Saajasto M., Juvela M., Dobashi K., Shimoikura T., Ristorcelli I., Montillaud J., Malinen J., Pelkonen V. M., Feher O., Rivera-Ingraham A., Toth V., Montier L., Bernard J.-Ph., Onishi, T.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 608 Pages: A21-A21

    • DOI

      10.1051/0004-6361/201630005

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] N2H+分子輝線の解析法を学ぶための学部生用天文教材の開発2017

    • Author(s)
      広瀬亜紗、土橋一仁、下井倉ともみ、西浦慎悟
    • Journal Title

      地学教育

      Volume: 69 Pages: 63-77

    • NAID

      130007493999

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 理科を専攻としない教員志望学生への「月の満ち欠け」の教育の必要性2017

    • Author(s)
      下井倉ともみ、土橋一仁
    • Journal Title

      地学教育

      Volume: 69 Pages: 211-227

    • NAID

      130006602652

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Wide-field 12CO (J=2-1) and 13CO (J=2-1) Observations toward the Aquila Rift and Serpens Molecular Cloud Complexes. I. Molecular Clouds and Their Physical Properties2017

    • Author(s)
      Nakamura, F., Dobashi, K., Shimoikura, T., Tanaka, T., and Onishi, T.
    • Journal Title

      The Astrophysical Journal

      Volume: 837 Issue: 2 Pages: 154-154

    • DOI

      10.3847/1538-4357/aa5ea6

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Discovery of Infalling Motion with Rotation of the Cluster-forming Clump S235AB and Its Implication to the Clump Structures2016

    • Author(s)
      Shimoikura, Tomomi, Dobashi Kazuhito, Matsumoto Tomoaki, Nakamura Fumitaka
    • Journal Title

      The Astrophysical Journal

      Volume: 832

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Z45: A new 45-GHz band dual-polarization HEMT receiver for the NRO 45-m radio telescope2015

    • Author(s)
      Nakamura F. 他22名
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 67 Issue: 6 Pages: 11719-11719

    • DOI

      10.1093/pasj/psv088

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dense Clumps and Candidates for Molecular Outflows in W402015

    • Author(s)
      Shimoikura, T., Dobashi, K., Nakamura, F., Hara, C., Tanaka, T., Shimajiri, Y., Kawabe, R.
    • Journal Title

      The Astrophysical Journal

      Volume: 806 Issue: 2 Pages: 201-220

    • DOI

      10.1088/0004-637x/806/2/201

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Catalog of dense cores in the Orion A giant molecular cloud2015

    • Author(s)
      Shimajiri, Yoshito; Kitamura, Y.; Nakamura, F.; Momose, M.; Saito, M.; Tsukagoshi, T.; Hiramatsu, M.; Shimoikura, T.; Dobashi, K.; Hara, C.; Kawabe, R.
    • Journal Title

      The Astrophysical Journal Supplement

      Volume: 217 Issue: 1 Pages: 7-35

    • DOI

      10.1088/0067-0049/217/1/7

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Star Formation in Turbulent Molecular Clouds with Colliding Flow2015

    • Author(s)
      T. Matsumoto, K. Dobashi, T. Shimoikura
    • Journal Title

      The Astrophysical Journal

      Volume: 801 Issue: 2 Pages: 77-98

    • DOI

      10.1088/0004-637x/801/2/77

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Revealing the Physical Properties of Molecular Gas in Orion with a Large-scale Survey in J = 2-1 Lines of 12CO, 13CO, and C18O2015

    • Author(s)
      Nishimura, A., Tokuda, K., Kimura, K., Muraoka, K., Maezawa, H., Ogawa, H., Dobashi, K., Shimoikura, T., Mizuno, A., Fukui, Y., Onishi, T.
    • Journal Title

      The Astrophysical Journal Supplement

      Volume: 216 Issue: 1 Pages: 18-42

    • DOI

      10.1088/0067-0049/216/1/18

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Colliding Filaments and a Massive Dense Core in the Cygnus OB 7 Molecular Cloud2014

    • Author(s)
      K. Dobashi 他 計7名
    • Journal Title

      The Astrophysical Journal

      Volume: 797 Issue: 1 Pages: 58-80

    • DOI

      10.1088/0004-637x/797/1/58

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Cluster Formation Triggered by Filament Collisions in Serpens South2014

    • Author(s)
      Fumitaka Nakamura, Koji Sugitani, Takahiro Tanaka, Hiroyuki Nishitani, Kazuhito Dobashi, Tomomi Shimoikura, Yoshito Shimajiri, Ryohei Kawabe, Yoshinori Yonekura, Izumi Mizuno, Kimihiko Kimura, Kazuki Tokuda, Minato Kozu, Nozomi Okada, Yutaka Hasegawa, Hideo Ogawa, Seiji Kameno, Hiroko Shinnaga, Munetake Momose, 他7名
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 791 Issue: 2 Pages: L23-L23

    • DOI

      10.1088/2041-8205/791/2/l23

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] 星団を形成するクランプの統計的研究2018

    • Author(s)
      下井倉ともみ、土橋一仁、中村文隆、廣田朋也、松本倫明
    • Organizer
      日本天文学会春季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 星団を形成するクランプの回転を伴う収縮運動2018

    • Author(s)
      土橋一仁、下井倉ともみ、中村文隆、廣田朋也、松本倫明
    • Organizer
      日本天文学会春季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Long cyanopolyynes at the G28.28-0.36 hot core2018

    • Author(s)
      Kotomi Taniguchi, Masao Saito, Yusuke Miyamoto, Tomomi Shimoikura, Kazuhito Dobashi, Tomoya Hirota, Fumitaka Nakamura, Hiroyuki Ozeki, Tetsuhiro Minamidani, Hiroyuki Kaneko
    • Organizer
      日本天文学会春季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 星形成レガシープロジェクトIII W40とSerpens South 領域のC18O分子輝線観測2018

    • Author(s)
      下井倉ともみ、土橋一仁、中村文隆
    • Organizer
      日本天文学会春季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 「太陽系の旅 銀河系の回転と地質年代」の教材開発2017

    • Author(s)
      下井倉ともみ、土橋一仁
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 小学校の授業で天体望遠鏡を使おう!初心者によくあるトラブルと対策2017

    • Author(s)
      土橋一仁、下井倉ともみ、西浦慎悟
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] N2H+分子輝線の解析の学部生向け教材の開発2017

    • Author(s)
      広瀬亜紗、土橋一仁、下井倉ともみ、西浦慎悟
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 教員志望学生を対象にした天体望遠鏡実習の授業実践とその効果2016

    • Author(s)
      下井倉ともみ、土橋一仁
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      愛媛大学(愛媛県・松山市)
    • Year and Date
      2016-09-14
    • Related Report
      2016 Annual Research Report
  • [Presentation] 磁場て支えられた分子雲コアの発見2016

    • Author(s)
      中村文隆, 亀野誠二, 土橋一仁, 下井倉ともみ, 谷口琴美
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      首都大学東京
    • Year and Date
      2016-03-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] TMC-1におけるCCS分子輝線のセーマン効果計測検証2016

    • Author(s)
      亀野誠二、中村文隆、土橋一仁、下井倉ともみ、谷口琴美
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      首都大学東京
    • Year and Date
      2016-03-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] ゼーマン効果検出を念頭においたTMC-1のCCS/H3NのOTF観測2016

    • Author(s)
      土橋一仁、下井倉ともみ、亀野誠二、中村文隆、谷口琴美
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      首都大学東京
    • Year and Date
      2016-03-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] 星形成レガシープロジェクト:Aquila Rift,Orion A,M17領域のCO分子雲カタログの作成2016

    • Author(s)
      中村文隆、下井倉ともみ, 土橋一仁、Quang Nguyen Luong、Patricio Sanhueza、原千穂美、島尻芳人
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      首都大学東京
    • Year and Date
      2016-03-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] 星団を形成するクランプの力学的進化2016

    • Author(s)
      下井倉ともみ、土橋一仁、松本倫明、中村文隆
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      首都大学東京
    • Year and Date
      2016-03-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] クラスターを形成するクランプの回転+インフォール運動のモデル化2016

    • Author(s)
      土橋一仁、下井倉ともみ、松本倫明、中村文隆
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      首都大学東京
    • Year and Date
      2016-03-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] 臼田64m等の衛星・探査機用アンテナを利用した電波天文観測のシステムと今後の方向性について2016

    • Author(s)
      村田泰宏他
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      甲南大学
    • Year and Date
      2016-03-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] 大阪府立大学 1.85m 電波望遠鏡による銀河系内分子雲の広域観測:2014年度進捗2015

    • Author(s)
      徳田一起他
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      甲南大学
    • Year and Date
      2015-09-09
    • Related Report
      2015 Annual Research Report
  • [Presentation] 温室効果検出への挑戦. I. よくある誤解と室内実験の問題点2015

    • Author(s)
      土橋一仁、下井倉ともみ、松本伸示
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      甲南大学
    • Year and Date
      2015-09-09
    • Related Report
      2015 Annual Research Report
  • [Presentation] 温室効果検出への挑戦. Ⅱ. 実験器の試作2015

    • Author(s)
      下井倉ともみ、土橋一仁、松本伸示
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      甲南大学
    • Year and Date
      2015-09-09
    • Related Report
      2015 Annual Research Report
  • [Presentation] おうし座分子雲に付随する冷たい HI ガスの定量2014

    • Author(s)
      土橋一仁、下井倉ともみ、Deborah Paradis、Jean-Philippe Beranrd
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      山形大学
    • Year and Date
      2014-09-11 – 2014-09-13
    • Related Report
      2014 Annual Research Report
  • [Presentation] W40に付随する分子雲の 12CO(J = 3 - 2) 及び HCO+(J = 4 - 3) 観測2014

    • Author(s)
      下井倉ともみ、土橋一仁、他 計9名
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      山形大学
    • Year and Date
      2014-09-11 – 2014-09-13
    • Related Report
      2014 Annual Research Report
  • [Presentation] 野辺山 45m 電波望遠鏡搭載 45 GHz 受信機(Z45)の試験観測2014

    • Author(s)
      落合哲、土橋一仁、他 計24名
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      山形大学
    • Year and Date
      2014-09-11 – 2014-09-13
    • Related Report
      2014 Annual Research Report
  • [Presentation] 星形成レガシープロジェクトIV. 大質量星形成領域DR21の分子輝線観測2014

    • Author(s)
      片倉翔、山日彬史、秦野義子、下井倉ともみ、土橋一仁、他 計10名
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      山形大学
    • Year and Date
      2014-09-11 – 2014-09-13
    • Related Report
      2014 Annual Research Report
  • [Presentation] 1.85m 電波望遠鏡による銀河面分子雲の広域探査 IV2014

    • Author(s)
      澤村将太郎、土橋一仁、他 計11名
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      山形大学
    • Year and Date
      2014-09-11 – 2014-09-13
    • Related Report
      2014 Annual Research Report

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Published: 2014-04-04   Modified: 2019-03-29  

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