Minimal HCN emission from molecular clouds in M33
文献类型：期刊论文
| 作者 | Rosolowsky, Erik1; Pineda, Jaime E.2,3; Gao, Yu4
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2011-08-01 |
| 卷号 | 415期号:2页码:1977-1984 |
| 关键词 | stars: formation ISM: clouds galaxies: individual: M33 radio lines: ISM |
| ISSN号 | 0035-8711 |
| 英文摘要 | Since HCN emission has been shown to be a linear tracer of ongoing star formation activity, we have searched for HCN (J = 1 -> 0) emission from known GMCs in the nearby galaxy M33. No significant HCN emission has been found along any of the lines of sight. We find two lines of sight with CO-to-HCN integrated intensity ratios up to 280, nearly a factor of 6 above what is found in comparable regions of the Milky Way. Star formation tracers suggest that the HCN-to-star formation rate ratio (L-HCN/(M) over dot(star)) is a factor of 6 lower than what is observed in the Milky Way (on average) and local extragalactic systems. Simple chemical models accounting for the subsolar N/O ratio suggest that depletion cannot account for the high CO-to-HCN ratios. Given HCN formation requires high extinction (A(V) > 4), low metallicity may yield reduced dust shielding and thus a high CO/HCN ratio. The turbulence and structure of GMCs in M33 are comparable to those found in other systems, so the differences are unlikely to result from different GMC properties. Since lower CO-to-HCN ratios are associated with the highest rates of star formation, we attribute the deficits in part to evolutionary effects within GMCs. |
| 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] | STAR-FORMING GALAXIES ; DENSE GAS ; FORMATION LAW ; SCHMIDT LAW ; CO ; GRADIENT ; TRACERS ; REGIONS ; COMPLEX ; CORES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000293756300080 |
| 公开日期 | 2012-08-07 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/4523]  |
| 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.Univ British Columbia Okanagan, Kelowna, BC V1V 1V7, Canada 2.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 3.Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England 4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Rosolowsky, Erik,Pineda, Jaime E.,Gao, Yu. Minimal HCN emission from molecular clouds in M33[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,415(2):1977-1984. |
| APA | Rosolowsky, Erik,Pineda, Jaime E.,&Gao, Yu.(2011).Minimal HCN emission from molecular clouds in M33.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,415(2),1977-1984. |
| MLA | Rosolowsky, Erik,et al."Minimal HCN emission from molecular clouds in M33".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 415.2(2011):1977-1984. |
入库方式： OAI收割
来源：紫金山天文台
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