Star-forming content of the giant molecular filaments in the Milky Way
文献类型：期刊论文
| 作者 | Zhang, M.1,2,3; Kainulainen, J.1,4; Mattern, M.5; Fang, M.6 ; Henning, Th.1
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2019-02-04 |
| 卷号 | 622页码:57 |
| ISSN号 | 1432-0746 |
| 关键词 | stars: formation stars: pre-main sequence ISM: clouds ISM: structure infrared: stars |
| DOI | 10.1051/0004-6361/201732400 |
| 通讯作者 | Zhang, M.(zhang@mpia.de) |
| 英文摘要 | Context. Through observations numerous giant molecular filaments (GMFs) have been discovered in the MilkyWay. Their role in the Galactic star formation and Galaxy-scale evolution of dense gas is unknown. Aims. We investigate systematically the star-forming content of all currently known GMFs. This allows us to estimate the star formation rates (SFRs) of the GMFs and to establish relationships between the SFRs and the GMF properties. Methods. We identified and classified the young stellar object (YSO) population of each GMF using multiwavelength photometry from near-to far-infrared. We estimated the total SFRs assuming a universal and fully sampled initial mass function and luminosity function. Results. We uniformly estimate the physical properties of 57 GMFs. The GMFs show correlations between the (CO)-C-13 line width, mass, and size, similar to Larson's relations. We identify 36 394 infrared excess sources in 57 GMFs and obtain SFRs for 46 GMFs. The median SFR surface density (Sigma(SFR)) and star formation efficiency (SFE) of GMFs are 0.62 M-circle dot Myr(-1) pc(-2) and 1%, similar to the nearby star-forming clouds. The star formation rate per free-fall time of GMFs is between 0.002-0.05 with the median value of 0.02. We also find a strong correlation between SFR and dense gas mass that is defined as gas mass above a visual extinction of 7 mag, which suggests that the SFRs of the GMFs scale similarly with dense gas as those of nearby molecular clouds. We also find a strong correlation between the mean SFR per unit length and dense gas mass per unit length. The origin of this scaling remains unknown, calling for further studies that can link the structure of GMFs to their SF activity and explore the differences between GMFs and other molecular clouds. |
| WOS关键词 | YOUNG STELLAR POPULATION ; MAIN-SEQUENCE STARS ; FORMATION RATES ; INTERSTELLAR EXTINCTION ; GALACTIC PLANE ; SPITZER SURVEY ; DENSITY DISTRIBUTION ; PHOTOMETRIC SYSTEM ; NEARBY GALAXIES ; CARBON-MONOXIDE |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | EDP SCIENCES S A |
| WOS记录号 | WOS:000457516600001 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/18796]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Zhang, M. |
| 作者单位 | 1.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 4.Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, S-43992 Onsala, Sweden 5.MPIfR, Hugel 69, D-53121 Bonn, Germany 6.Univ Arizona, Dept Astron, 933 North Cherry Ave, Tucson, AZ 85721 USA |
| 推荐引用方式 GB/T 7714 | Zhang, M.,Kainulainen, J.,Mattern, M.,et al. Star-forming content of the giant molecular filaments in the Milky Way[J]. ASTRONOMY & ASTROPHYSICS,2019,622:57. |
| APA | Zhang, M.,Kainulainen, J.,Mattern, M.,Fang, M.,&Henning, Th..(2019).Star-forming content of the giant molecular filaments in the Milky Way.ASTRONOMY & ASTROPHYSICS,622,57. |
| MLA | Zhang, M.,et al."Star-forming content of the giant molecular filaments in the Milky Way".ASTRONOMY & ASTROPHYSICS 622(2019):57. |
入库方式： OAI收割
来源：紫金山天文台
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