Revealing the origin of dark gas around molecular clouds using the velocity-dispersion method
| Project/Area Number |
26287030
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Tokyo Gakugei University |
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Principal Investigator |
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| 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)
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| 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)
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| Keywords | 電波天文学 / データベース天文学 |
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| 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.
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Report
(5 results)
Research Products
(38 results)
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[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.
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Journal Title
Astronomy & Astrophysics
Volume: 608
Pages: A21-A21
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[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.
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Journal Title
The Astrophysical Journal
Volume: 806
Issue: 2
Pages: 201-220
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[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.
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Journal Title
The Astrophysical Journal Supplement
Volume: 217
Issue: 1
Pages: 7-35
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[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.
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Journal Title
The Astrophysical Journal Supplement
Volume: 216
Issue: 1
Pages: 18-42
DOI
Related Report
Peer Reviewed / Open Access
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[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
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Journal Title
The Astrophysical Journal Letters
Volume: 791
Issue: 2
Pages: L23-L23
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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