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Molecular Cloud Distances Based on the MWISP CO Survey and Gaia DR2
Yan, Qing-Zeng1; Yang, Ji; Sun, Yan; Su, Yang; Xu, Ye
2019-11-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume885Issue:1Pages:19
Corresponding AuthorYan, Qing-Zeng(qzyan@pmo.ac.cn)
AbstractWe 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.
KeywordInterstellar dust extinction Astrostatistics techniques Interstellar clouds Interstellar molecules
DOI10.3847/1538-4357/ab458e
WOS KeywordMILKY-WAY ; STAR-FORMATION ; GAS ; GALAXY ; VIEW
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000498556900004
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35147
Collection中国科学院紫金山天文台
Corresponding AuthorYan, Qing-Zeng
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210034, Jiangsu, Peoples R China
Recommended Citation
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.
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