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The thermal state of molecular clouds in the Galactic center: evidence for non-photon-driven heating
文献类型：期刊论文
| 作者 | Ao, Y.1,2; Henkel, C.1,3; Menten, K. M.1; Requena-Torres, M. A.1; Stanke, T.4; Mauersberger, R.5; Aalto, S.6; Muehle, S.7; Mangum, J.8 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2013-02-01 |
| 卷号 | 550页码:A135-A135 |
| 关键词 | Galaxy: center ISM: clouds ISM: molecules radio lines: ISM |
| ISSN号 | 0004-6361 |
| 通讯作者 | Ao, Y (reprint author), Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany. Email: ypao@mpifr-bonn.mpg.de |
| 英文摘要 | We used the Atacama Pathfinder Experiment (APEX) 12 m telescope to observe the J(KAKc) = 3(03) -> 2(02), 3(22) -> 2(21), and 3(21) -> 2(20) transitions of para-H2CO at 218 GHz simultaneously to determine kinetic temperatures of the dense gas in the central molecular zone (CMZ) of our Galaxy. The map extends over approximately 40' x 8' (similar to 100 x 20 pc(2)) along the Galactic plane with a linear resolution of 1.2 pc. The strongest of the three lines, the H2CO (3(03) -> 2(02)) transition, is found to be widespread, and its emission shows a spatial distribution similar to ammonia. The relative abundance of para-H2CO is 0.5 - 1.2 x 10(-9), which is consistent with results from lower frequency H2CO absorption lines. Derived gas kinetic temperatures for individual molecular clouds range from 50K to values in excess of 100 K. While a systematic trend toward (decreasing) kinetic temperature versus (increasing) angular distance from the Galactic center (GC) is not found, the clouds with highest temperature (T-kin > 100 K) are all located near the nucleus. For the molecular gas outside the dense clouds, the average kinetic temperature is 65 +/- 10 K. The high temperatures of molecular clouds on large scales in the GC region may be driven by turbulent energy dissipation and / or cosmic-rays instead of photons. Such a non-photon-driven thermal state of the molecular gas provides an excellent template for the more distant vigorous starbursts found in ultraluminous infrared galaxies (ULIRGs). |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | INTER-STELLAR CLOUDS ; SPECTRAL-LINE SURVEY ; PHYSICAL CONDITIONS ; INTERSTELLAR CLOUDS ; CENTER REGION ; FORMING REGIONS ; SAGITTARIUS B2 ; MASS FUNCTION ; SIO EMISSION ; HOT AMMONIA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000314879700135 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9831]  |
| 专题 | 紫金山天文台_分子云与恒星形成研究团组 |
| 作者单位 | 1.Max Planck Inst Radioastron, D-53121 Bonn, Germany 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.King Abdulaziz Univ, Dept Astron, Jeddah 21413, Saudi Arabia 4.ESO, D-85748 Garching, Germany 5.Joint ALMA Observ, Santiago, Chile 6.Chalmers, Onsala Observ, Dept Earth & Space Sci, S-43994 Onsala, Sweden 7.Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany 8.Natl Radio Astron Observ, Charlottesville, VA 22903 USA |
| 推荐引用方式 GB/T 7714 | Ao, Y.,Henkel, C.,Menten, K. M.,et al. The thermal state of molecular clouds in the Galactic center: evidence for non-photon-driven heating[J]. ASTRONOMY & ASTROPHYSICS,2013,550:A135-A135. |
| APA | Ao, Y..,Henkel, C..,Menten, K. M..,Requena-Torres, M. A..,Stanke, T..,...&Mangum, J..(2013).The thermal state of molecular clouds in the Galactic center: evidence for non-photon-driven heating.ASTRONOMY & ASTROPHYSICS,550,A135-A135. |
| MLA | Ao, Y.,et al."The thermal state of molecular clouds in the Galactic center: evidence for non-photon-driven heating".ASTRONOMY & ASTROPHYSICS 550(2013):A135-A135. |
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来源：紫金山天文台
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