Molecular Cloud Distances Based on the MWISP CO Survey and Gaia DR2
文献类型：期刊论文
| 作者 | Yan, Qing-Zeng2; Yang, Ji; Sun, Yan; Su, Yang; Xu, Ye |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-11-01 |
| 卷号 | 885期号:1页码:19 |
| 关键词 | Interstellar dust extinction Astrostatistics techniques Interstellar clouds Interstellar molecules |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab458e |
| 通讯作者 | Yan, Qing-Zeng(qzyan@pmo.ac.cn) |
| 英文摘要 | We present a new method of calculating distances of molecular clouds in the Galactic plane, using CO observations and the Gaia DR2 parallax and G-band extinction (A(G)) measurements. Due to the complexity of dust environments in the Galactic plane, A(G) contains irregular variations, which are difficult to model. To overcome this, we propose that the A(G) of off-cloud stars (Gaia stars around molecular clouds) can be used as a baseline to calibrate the A(G) of on-cloud stars (Gaia stars toward molecular clouds), which removes the A(G) components that are unrelated to molecular clouds. The distance is subsequently inferred from the jump point in on-cloud A(G) with Bayesian analysis and Markov chain Monte Carlo (MCMC) sampling. We applied this baseline subtraction method to a 100 deg(2) region (209.degrees 75 <= l <= 219.degrees 75, and vertical bar b vertical bar <= 5 degrees) in the third Galactic quadrant, which was mapped as part of the Milky Way Imaging Scroll Painting (MWISP) project, covering three CO isotopologue lines, and derived distances and masses for 11 molecular clouds, including the Maddalena molecular cloud and Sh 2-287. The results indicate that the distance of the Perseus Arm in this region is about 2.4 kpc and molecular clouds are present in the interarm regions. |
| WOS关键词 | MILKY-WAY ; STAR-FORMATION ; GAS ; GALAXY ; VIEW |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000498556900004 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/35146]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Yan, Qing-Zeng |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210034, Jiangsu, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yan, Qing-Zeng,Yang, Ji,Sun, Yan,et al. Molecular Cloud Distances Based on the MWISP CO Survey and Gaia DR2[J]. ASTROPHYSICAL JOURNAL,2019,885(1):19. |
| APA | Yan, Qing-Zeng,Yang, Ji,Sun, Yan,Su, Yang,&Xu, Ye.(2019).Molecular Cloud Distances Based on the MWISP CO Survey and Gaia DR2.ASTROPHYSICAL JOURNAL,885(1),19. |
| MLA | Yan, Qing-Zeng,et al."Molecular Cloud Distances Based on the MWISP CO Survey and Gaia DR2".ASTROPHYSICAL JOURNAL 885.1(2019):19. |
入库方式： OAI收割
来源：紫金山天文台
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