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题名: THE DENSE FILAMENTARY GIANT MOLECULAR CLOUD G23.0-0.4: BIRTHPLACE OF ONGOING MASSIVE STAR FORMATION
作者: Su, Yang1, 2; Zhang, Shaobo1, 2; Shao, Xiangjun1, 3; Yang Ji(杨戟)1, 2
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015-10-01
卷号: 811, 期号:2, 页码:134-145
关键词: ISM: clouds ; ISM: individual objects (GMC G23.0-0.4) ; ISM: molecules ; stars: formation
学科分类: 射电天文学
DOI: 10.1088/0004-637X/811/2/134
文章类型: Article
英文摘要: We present observations of 1.5 square degree maps of the (CO)-C-12, (CO)-C-13, and (CO)-O-18 (J = 1 - 0) emission toward the complex region of the supernova remnant (SNR) W41 and SNR G22.7-0.2. A massive (similar to 5 x 10(5) M-circle dot), large (similar to 84 x 15 pc), and dense (similar to 10(3) cm(-3)) giant molecular cloud (GMC), G23.0-0.4 with V-LSR similar to 77 km s(-1), is found to be adjacent to the two SNRs. The GMC displays a filamentary structure approximately along the Galactic plane. The filamentary structure of the dense molecular gas, traced by (CO)-O-18 (J = 1 - 0) emission, is also coincident well with the distribution of the dust-continuum emission in the direction. Two dense massive MC clumps, two 6.7 GHz methanol masers, and one H II/SNR complex, associated with the 77 km s(-1) GMC G23.0-0.4, are aligned along the filamentary structure, indicating the star-forming activity within the GMC. These sources have periodic projected spacing of 0 degrees.18-0 degrees.26 along the giant filament, which is consistent with the theoretical predictions of 0 degrees.22. This indicates that the turbulence seems to dominate the fragmentation process of the dense gaseous filament on a large scale. The established 4.4 kpc distance of the GMC and the long dense filament traced by (CO)-O-18 emission, together with the rich massive star-formation groups in the nearby region, suggest that G23.0-0.4 is probably located at the near side of the Scutum-Centaurus arm in the first quadrant. Considering the large scale and the elongation structure along the Galactic plane, we speculate that the dense filamentary GMC is related to the spiral density wave of the Milky Way.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: INFRARED-DARK CLOUD ; H-II REGIONS ; GALACTIC RING SURVEY ; COMPACT HII-REGIONS ; MILKY-WAY ; TRIGONOMETRIC PARALLAXES ; CLUSTER-FORMATION ; METHANOL MASERS ; ATLASGAL SURVEY ; SOURCE CATALOG
收录类别: SCI
项目资助者: NSFC(11233001 ; Strategic Priority Research Program, the Emergence of Cosmological Structures of the Chinese Academy of Sciences(XDB09000000) ; 11233007)
语种: 英语
WOS记录号: WOS:000363513800062
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15323
Appears in Collections:期刊(老文献)_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, Key Lab Radio Astron, Nanjing 210008, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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