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AN OUTER ARM IN THE SECOND GALACTIC QUADRANT: STRUCTURE
Du, Xinyu1,2,3; Xu, Ye1,3; Yang, Ji1,3; Sun, Yan1,2,3; Li, Facheng1,2,3; Zhang, Shaobo1,3; Zhou, Xin1,3
2016-05-01
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume224Issue:1
AbstractThe lack of arm tracers, especially remote tracers, is one of the most difficult problems preventing us from studying the structure of the Milky Way. Fortunately, with its high-sensitivity CO survey, the Milky Way Imaging Scroll Painting (MWISP) project offers such an opportunity. Since completing about one-third of its mission, an area of l = [100, 150]degrees, b = [-3, 5]degrees has nearly been covered. The Outer arm of the Milky Way first clearly revealed its shape in the second galactic quadrant in the form of molecular gas-this is the first time that the Outer arm has been reported in such a large-scale mapping of molecular gas. Using the 115 GHz (CO)-C-12(1-0) data of MWISP at the LSR velocity similar or equal to[-100, -60] km s(-1) and in the area mentioned above, we have detected 481 molecular clouds in total, and among them 332 (about 69%) are newly detected and 457 probably belong to the Outer arm. The total mass of the detected Outer arm clouds is similar to 3.1 x 10(6) M-circle dot. Assuming that the spiral arm is a logarithmic spiral, the pitch angle is fitted as similar to 13 degrees.1. Besides combining both the CO data from MWISP and the 21 cm H I data from the Canadian Galactic Plane Survey (CGPS), the gas distribution, warp, and thickness of the Outer arm are also studied.
KeywordCatalogs Galaxy: Structure Ism: Clouds Ism: Molecules
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3847/0067-0049/224/1/7
WOS KeywordSTAR-FORMING REGIONS ; MILKY-WAY ; MOLECULAR CLOUDS ; SPIRAL STRUCTURE ; NEUTRAL-HYDROGEN ; SOLAR CIRCLE ; TRIGONOMETRIC PARALLAXES ; ATOMIC-HYDROGEN ; RADIO ASTRONOMY ; IRAS SOURCES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000377050200007
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16228
Collection紫金山天文台青海观测站
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Grad Univ, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Du, Xinyu,Xu, Ye,Yang, Ji,et al. AN OUTER ARM IN THE SECOND GALACTIC QUADRANT: STRUCTURE[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2016,224(1).
APA Du, Xinyu.,Xu, Ye.,Yang, Ji.,Sun, Yan.,Li, Facheng.,...&Zhou, Xin.(2016).AN OUTER ARM IN THE SECOND GALACTIC QUADRANT: STRUCTURE.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,224(1).
MLA Du, Xinyu,et al."AN OUTER ARM IN THE SECOND GALACTIC QUADRANT: STRUCTURE".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 224.1(2016).
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