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MOLECULAR GAS IN EXTREME STAR-FORMING ENVIRONMENTS: THE STARBURSTS Arp 220 AND NGC 6240 AS CASE STUDIES
文献类型：期刊论文
| 作者 | Greve, T. R.1,2; Papadopoulos, P. P.3; Gao, Y.4 ; Radford, S. J. E.2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2009-02-20 |
| 卷号 | 692期号:2页码:1432-1446 |
| 关键词 | galaxies: individual (Arp 220, NGC 6240) galaxies: starburst ISM: molecules |
| ISSN号 | 0004-637X |
| 英文摘要 | We report single-dish multitransition measurements of the (CO)-C-12, HCN, and HCO+ molecular line emission as well as HNC J = 1-0 and HNCO in the two ultraluminous IR galaxies Arp 220 and NGC 6240. Using this new molecular line inventory, in conjunction with existing data in the literature, we compiled the most extensive molecular line data sets to date for such galaxies. The many rotational transitions, with their different excitation requirements, allow the study of the molecular gas over a wide range of different densities and temperatures with significant redundancy, and thus allow good constraints on the properties of the dense gas in these two systems. The mass (similar to (1-2) x10(10)M(circle dot)) of dense gas (greater than or similar to 10(5-6) cm(-3)) found accounts for the bulk of their molecular gas mass, and is consistent with most of their IR luminosities powered by intense starbursts while self-regulated by O, B star cluster radiative pressure onto the star-forming dense molecular gas. The highly excited HCN transitions trace a gas phase similar to (10-100) x denser than that of the subthermally excited HCO+ lines (for both galaxies). These two phases are consistent with an underlying density-size power law found for Galactic giant molecular clouds (but with a steeper exponent), with HCN lines tracing denser and more compact regions than HCO+. Whether this is true in IR-luminous, star-forming galaxies in general remains to be seen, and underlines the need for observations of molecular transitions with high critical densities for a sample of bright (U) LIRGs in the local universe-a task for which the HI-FI instrument on board Herschel is ideally suited to do. |
| 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] | ULTRALUMINOUS INFRARED GALAXIES ; SPECTRAL ENERGY-DISTRIBUTION ; ACTIVE GALACTIC NUCLEUS ; HNC LINE EMISSION ; DENSE GAS ; ROTATIONAL-EXCITATION ; INTERSTELLAR-MEDIUM ; LUMINOUS GALAXIES ; PHYSICAL CONDITIONS ; THERMAL BALANCE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000263674700035 |
| 公开日期 | 2011-12-08 |
| 源URL | [http://159.226.72.40/handle/332002/1593]  |
| 专题 | 紫金山天文台_星系中的恒星形成研究团组 |
| 作者单位 | 1.Max Planck Inst Astron, D-69117 Heidelberg, Germany 2.CALTECH, Pasadena, CA 91125 USA 3.Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany 4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Greve, T. R.,Papadopoulos, P. P.,Gao, Y.,et al. MOLECULAR GAS IN EXTREME STAR-FORMING ENVIRONMENTS: THE STARBURSTS Arp 220 AND NGC 6240 AS CASE STUDIES[J]. ASTROPHYSICAL JOURNAL,2009,692(2):1432-1446. |
| APA | Greve, T. R.,Papadopoulos, P. P.,Gao, Y.,&Radford, S. J. E..(2009).MOLECULAR GAS IN EXTREME STAR-FORMING ENVIRONMENTS: THE STARBURSTS Arp 220 AND NGC 6240 AS CASE STUDIES.ASTROPHYSICAL JOURNAL,692(2),1432-1446. |
| MLA | Greve, T. R.,et al."MOLECULAR GAS IN EXTREME STAR-FORMING ENVIRONMENTS: THE STARBURSTS Arp 220 AND NGC 6240 AS CASE STUDIES".ASTROPHYSICAL JOURNAL 692.2(2009):1432-1446. |
入库方式： OAI收割
来源：紫金山天文台
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