Chemical Evolution of N2H+ in Six Massive Star-forming Region
文献类型：期刊论文
| 作者 | Yu, Nai-Ping; Xu, Jin-Long; Wang, Jun-Jie; Liu, Xiao-Lan |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018-10-01 |
| 卷号 | 865期号:2页码:11 |
| 关键词 | ISM: abundances ISM: clouds ISM: molecules H II regions |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aadb94 |
| 英文摘要 | To investigate how the abundance of N2H+ varies as massive clumps evolve, here we present a multiwavelength study toward six molecular clouds. All of these clouds contain several massive clumps in different evolutionary stages of star formation. Using archival data of the Herschel infrared Galactic Plane Survey (Hi-GAL), we made H-2 column density and dust temperature maps of these regions by the spectral energy distribution method. We found that all of the six clouds show distinct dust temperature gradients, ranging from similar to 20 to similar to 30 K. This makes them good candidates to study chemical evolution of molecules (such as N2H+) in different evolutionary stages of star formation. Our molecular line data comes from the Millimeter Astronomy Legacy Team Survey at 90 GHz (MALT90). We made column density and then abundance maps of N2H+. We found that when the dust temperature is above 27 K, the abundance of N2H+ begins to decrease or reaches a plateau. We regard that this is because in the photodissociation regions around classical H II regions, N2H+ is heavily destroyed by free electrons. However, when the dust temperature is below 27 K, the abundance of N2H+ increases with the dust temperature. This seems to be inconsistent with previous chemical models made in low-mass star-forming regions. In order to investigate whether this inconsistency is caused by a different chemistry in high-mass star-forming clumps, higher angular resolution observations are necessary. |
| WOS关键词 | BUBBLING GALACTIC DISK ; MOLECULAR LINE ; PROTOSTELLAR CORES ; SOUTHERN SKY ; DARK CLOUD ; CATALOG ; CLUMPS |
| 资助项目 | Science and Technology Facilities Council of the UK ; Commonwealth of Australia ; National Natural Science Foundation of China[11503037] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000446180200007 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | Science and Technology Facilities Council of the UK ; Science and Technology Facilities Council of the UK ; Commonwealth of Australia ; Commonwealth of Australia ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Facilities Council of the UK ; Science and Technology Facilities Council of the UK ; Commonwealth of Australia ; Commonwealth of Australia ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Facilities Council of the UK ; Science and Technology Facilities Council of the UK ; Commonwealth of Australia ; Commonwealth of Australia ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Facilities Council of the UK ; Science and Technology Facilities Council of the UK ; Commonwealth of Australia ; Commonwealth of Australia ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/22899]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Yu, Nai-Ping |
| 作者单位 | Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Nai-Ping,Xu, Jin-Long,Wang, Jun-Jie,et al. Chemical Evolution of N2H+ in Six Massive Star-forming Region[J]. ASTROPHYSICAL JOURNAL,2018,865(2):11. |
| APA | Yu, Nai-Ping,Xu, Jin-Long,Wang, Jun-Jie,&Liu, Xiao-Lan.(2018).Chemical Evolution of N2H+ in Six Massive Star-forming Region.ASTROPHYSICAL JOURNAL,865(2),11. |
| MLA | Yu, Nai-Ping,et al."Chemical Evolution of N2H+ in Six Massive Star-forming Region".ASTROPHYSICAL JOURNAL 865.2(2018):11. |
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来源：国家天文台
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