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Structural Variation of Molecular Gas in the Sagittarius Arm and Interarm Regions
http://hdl.handle.net/10232/18780
http://hdl.handle.net/10232/18780ac2a15e3-c939-4e0f-ab86-e804ccdedb2e
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
HANDA_0004-637X_752_2_118.pdf (6.3 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2014-12-22 | |||||
| タイトル | ||||||
| タイトル | Structural Variation of Molecular Gas in the Sagittarius Arm and Interarm Regions | |||||
| タイトル言語 | en | |||||
| 著者 |
澤田, 剛士
× 澤田, 剛士× 長谷川, 哲夫× 杉本, 正宏× 幸田, 仁× Handa, Toshihiro |
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| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Galaxy: disk | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | ISM: clouds | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | ISM: molecules | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | radio lines: ISM | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | surveys | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| 要約 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | We have carried out survey observations toward the Galactic plane at l ≈ 38° in the 12CO and 13CO J = 1-0 lines using the Nobeyama Radio Observatory 45 m telescope. A wide area (0fdg8 × 0fdg8) was mapped with high spatial resolution (17''). The line of sight samples the gas in both the Sagittarius arm and the interarm regions. The present observations reveal how the structure and physical conditions vary across a spiral arm. We classify the molecular gas in the line of sight into two distinct components based on its appearance: the bright and compact B component and the fainter and diffuse (i.e., more extended) D component. The B component is predominantly seen at the spiral arm velocities, while the D component dominates at the interarm velocities and is also found at the spiral arm velocities. We introduce the brightness distribution function and the brightness distribution index (BDI, which indicates the dominance of the B component) in order to quantify the map's appearance. The radial velocities of BDI peaks coincide with those of high 12CO J = 3-2/12CO J = 1-0 intensity ratio (i.e., warm gas) and H II regions, and tend to be offset from the line brightness peaks at lower velocities (i.e., presumably downstream side of the arm). Our observations reveal that the gas structure at small scales changes across a spiral arm: bright and spatially confined structures develop in a spiral arm, leading to star formation at the downstream side, while extended emission dominates in the interarm region. | |||||
| 内容記述言語 | en | |||||
| 収録雑誌名 |
en : The Astrophysical Journal 巻 752, 号 2, 発行日 2012 |
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| 作成日 | ||||||
| 日付 | 2012-06-04 | |||||
| 日付タイプ | Issued | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| ISSN | 0004637X | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| DOI | https://doi.org/10.1088/0004-637X/752/2/118 | |||||
| 権利 | ||||||
| 権利情報の言語 | en | |||||
| 権利情報 | American Astronomical Society | |||||
| 出版タイプ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| NDC | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 440 | |||||
| 公開者・出版者 | ||||||
| 出版者 | IOP Publishing/American Astronomical Society | |||||
| 出版者言語 | en | |||||
