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题名: AN OUTER ARM IN THE SECOND GALACTIC QUADRANT: STRUCTURE
作者: Du, Xinyu1, 2, 3; Xu Ye(徐烨)1, 3; Yang Ji(杨戟)1, 3; Sun, Yan1, 2, 3; Li, Facheng1, 2, 3; Zhang, Shaobo1, 3; Zhou Xin(周鑫)1, 3
刊名: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期: 2016-05-01
卷号: 224, 期号:1
关键词: catalogs ; Galaxy: structure ; ISM: clouds ; ISM: molecules
DOI: 10.3847/0067-0049/224/1/7
文章类型: Article
英文摘要: The 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: STAR-FORMING REGIONS ; MILKY-WAY ; MOLECULAR CLOUDS ; SPIRAL STRUCTURE ; NEUTRAL-HYDROGEN ; SOLAR CIRCLE ; TRIGONOMETRIC PARALLAXES ; ATOMIC-HYDROGEN ; RADIO ASTRONOMY ; IRAS SOURCES
收录类别: SCI
项目资助者: National Natural Science Foundation of China(11133008 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB09010300) ; Key Laboratory for Radio Astronomy ; 11233007)
语种: 英语
WOS记录号: WOS:000377050200007
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16228
Appears in Collections:紫金山天文台青海观测站_期刊论文

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作者单位: 1.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
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