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Two-dimensional Molecular Gas and Ongoing Star Formation around H ii Region Sh2-104
Xu,Jin-Long1; Xu,Ye2,3; Yu,Naiping1; Zhang,Chuan-peng1; Liu,Xiao-Lan1; Wang,Jun-Jie1; Ning,Chang-chun4; Ju,Bing-Gang3; Zhang,Guo-Yin1
Source PublicationThe Astrophysical Journal
AbstractAbstract We performed a multi-wavelength study toward H ii region Sh2-104. New maps of 12CO J?=?1???0 and 13CO J?=?1???0 were obtained from the Purple Mountain Observatory 13.7 m radio telescope. Sh2-104 displays a double-ring structure. The outer ring with a radius of 4.4 pc is dominated by 12, 500 μm, 12CO J?=?1???0, and 13CO J?=?1???0 emission, while the inner ring with a radius of 2.9 pc is dominated by 22 μm and 21 cm emission. We did not detect CO emission inside the outer ring. The north–east portion of the outer ring is blueshifted, while the south–west portion is redshifted. The present observations have provided evidence that the collected outer ring around Sh2-104 is a two-dimensional structure. From the column density map constructed by the Hi-GAL survey data, we extract 21 clumps. About 90% of all the clumps will form low-mass stars. A power-law fit to the clumps yields . The selected YSOs are associated with the collected material on the edge of Sh2-104. The derived dynamical age of Sh2-104 is yr. Comparing the Sh2-104 dynamical age with the YSO timescale and the fragmentation time of the molecular ring, we further confirm that the collect-and-collapse process operates in this region, indicating positive feedback from a massive star for surrounding gas.
KeywordH ii regions ISM: clouds stars: early-type stars: formation
WOS IDIOP:0004-637X-849-2-aa8ee0
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;
2.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China
3.Purple Mountain Observatory, Qinghai Station, 817000, Delingha, China
4.Tibet University, Lhasa, Tibet 850000, China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
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GB/T 7714
Xu,Jin-Long,Xu,Ye,Yu,Naiping,et al. Two-dimensional Molecular Gas and Ongoing Star Formation around H ii Region Sh2-104[J]. The Astrophysical Journal,2017,849(2).
APA Xu,Jin-Long.,Xu,Ye.,Yu,Naiping.,Zhang,Chuan-peng.,Liu,Xiao-Lan.,...&Zhang,Guo-Yin.(2017).Two-dimensional Molecular Gas and Ongoing Star Formation around H ii Region Sh2-104.The Astrophysical Journal,849(2).
MLA Xu,Jin-Long,et al."Two-dimensional Molecular Gas and Ongoing Star Formation around H ii Region Sh2-104".The Astrophysical Journal 849.2(2017).
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