Planck Galactic Cold Clumps at High Galactic Latitude—a Study with CO Lines

doi:10.3847/1538-4357/ac1686

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	Planck Galactic Cold Clumps at High Galactic Latitude—a Study with CO Lines
	Xu,Fengwei 1,2; Wu,Yuefang 1,2; Liu,Tie 3,4; Liu,Xunchuan 1,2; Zhang,Chao 1,5; Esimbek,Jarken 6,7; Qin,Sheng-Li 5; Li,Di 8,9; Wang,Ke 2; Yuan,Jinghua 10
刊名	The Astrophysical Journal
	2021-10-01
卷号	920 期号:2
关键词	Dark interstellar clouds Interstellar molecules Star formation
ISSN号	0004-637X
DOI	10.3847/1538-4357/ac1686
通讯作者	Xu,Fengwei()
英文摘要	Abstract Gas at high Galactic latitude is a relatively little noticed component of the interstellar medium. In an effort to address this, 41 Planck Galactic Cold Clumps at high Galactic latitude (HGal; ∣b∣ > 25°) were observed in 12CO, 13CO, and C18O J = 1?0 lines, using the Purple Mountain Observatory 13.7 m telescope. 12CO (1?0) and 13CO (1?0) emission was detected in all clumps, while C18O (1?0) emission was only seen in 16 clumps. The highest and average latitudes are 71.°4 and 37.°8, respectively. Fifty-one velocity components were obtained, and then each was identified as a single clump. Thirty-three clumps were further mapped at 1′ resolution, and 54 dense cores were extracted. Among dense cores, the average excitation temperature Tex of 12CO is 10.3 K. The average line widths of thermal and nonthermal velocity dispersions are 0.19 and 0.46 km s?1, respectively, suggesting that these cores are dominated by turbulence. Distances of the HGal clumps given by Gaia dust reddening are about 120–360 pc. The ratio of X13/X18 is significantly higher than that in the solar neighborhood, implying that HGal gas has a different star formation history compared to the gas in the Galactic disk. HGal cores with sizes from 0.01 to 0.1 pc show no notable Larson’s relation, and the turbulence remains supersonic down to a scale of slightly below 0.1 pc. None of the HGal cores that bear masses from 0.01 to 1 M⊙ are gravitationally bound, and all appear to be confined by outer pressure.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-920-2-AC1686
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/4294]
专题	恒星形成与演化研究团组
通讯作者	Xu,Fengwei
作者单位	1.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of China; fengwei.astro@pku.edu.cn, fengwei.astro@pku.edu.cn 2.Kavli Institute for Astronomy and Astrophysics, Peking University, Haidian District, Beijing 100871, People's Republic of China 3.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China 4.Korea Astronomy and Space Science Institute, 776 Daedeokdaero, Yuseong-gu, Daejeon 34055, Republic of Korea 5.Department of Astronomy, Yunnan University, and Key Laboratory of Astroparticle Physics of Yunnan Province, Kunming 650091, People's Republic of China 6.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, People's Republic of China 7.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Urumqi 830011, People's Republic of China 8.CAS Key Laboratory of FAST, National Astronomical Observatories, CAS, Beijing 100012, People's Republic of China 9.NAOC-UKZN Computational Astrophysics Centre (NUCAC), University of KwaZulu-Natal, Durban 4000, South Africa 10.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People's Republic of China
推荐引用方式 GB/T 7714	Xu,Fengwei,Wu,Yuefang,Liu,Tie,et al. Planck Galactic Cold Clumps at High Galactic Latitude—a Study with CO Lines[J]. The Astrophysical Journal,2021,920(2).
APA	Xu,Fengwei.,Wu,Yuefang.,Liu,Tie.,Liu,Xunchuan.,Zhang,Chao.,...&Ju,Binggang.(2021).Planck Galactic Cold Clumps at High Galactic Latitude—a Study with CO Lines.The Astrophysical Journal,920(2).
MLA	Xu,Fengwei,et al."Planck Galactic Cold Clumps at High Galactic Latitude—a Study with CO Lines".The Astrophysical Journal 920.2(2021).