2022 Fiscal Year Final Research Report
Internal Structure and Distribution of Neutral Carbon in Molecular Clouds Revealed by Absorption and Emission Line Observations with ALMA
| Project/Area Number |
20K04034
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 16010:Astronomy-related
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| Research Institution | Fukui University of Technology (2022)
National Astronomical Observatory of Japan (2020-2021) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
石井 峻 国立天文台, アルマプロジェクト, 特任准教授 (70733567)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 電波天文学 / 星間物質 / 分子雲 |
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| Outline of Final Research Achievements |
We performed high spatial resolution CO and [CI] observations toward bright quasars (QSOs) behind the Milky-Way with ALMA and detected absorption lines of molecular clouds in the foreground of the QSOs. Detailed analysis of the spectra revealed that the distribution of CO and [CI] is different inside the molecular cloud. In order to verify the usefulness of [CI] as a molecular gas tracer, we also performed [CI] observations of the nearby spiral galaxy M 83 and showed that the molecular gas mass determined by [CI] tend to be underestimated compared to other tracers in the disk region.
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| Free Research Field |
天文学
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| Academic Significance and Societal Importance of the Research Achievements |
星形成の母体である分子雲の分布および内部構造を明らかにすることは、星形成および銀河進化を理解する上で本質的に重要である。分子雲の主成分は水素分子であるが、直接観測できない。本研究は、水素分子に変わる分子雲トレーサーとして用いられている一酸化炭素（CO）や炭素原子[CI]について、それらの分子雲内部から銀河円盤に渡る分布を、吸収線および輝線観測から明らかにした。
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