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 2,3; Wu, Yuefang 2,3; Liu, Tie 4,5; Liu, Xunchuan 2,3; Zhang, Chao 2,6,7; Esimbek, Jarken 8,9; Qin, Sheng-Li 6,7; Li, Di 10,11; Wang, Ke 3; Yuan, Jinghua 12
刊名	ASTROPHYSICAL JOURNAL
	2021-10-01
卷号	920 期号:2 页码:29
ISSN号	0004-637X
DOI	10.3847/1538-4357/ac1686
通讯作者	Xu, Fengwei(fengwei.astro@pku.edu.cn)
英文摘要	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; divide b divide > 25 degrees) were observed in (CO)-C-12, (CO)-C-13, and (CO)-O-18 J = 1-0 lines, using the Purple Mountain Observatory 13.7 m telescope. (CO)-C-12 (1-0) and (CO)-C-13 (1-0) emission was detected in all clumps, while (CO)-O-18 (1-0) emission was only seen in 16 clumps. The highest and average latitudes are 71.degrees 4 and 37.degrees 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 T (ex) of (CO)-C-12 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 X (13)/X (18) 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 (circle dot) are gravitationally bound, and all appear to be confined by outer pressure.
资助项目	NSFC[11433008] ; NSFC[12033005] ; NSFC[11988101] ; NSFC[11373009] ; NSFC[11503035] ; NSFC[11573036] ; China Ministry of Science and Technology[2012CB821800] ; National Key R&D Program of China[2017YFA0402600] ; National Aeronautics and Space Administration[80NM0018D0004] ; National Science Foundation[ACI-1440620] ; [CONICYT/PCI/REDI170243]
WOS关键词	MOLECULAR CLOUDS ; CARBON-MONOXIDE ; STAR-FORMATION ; H-I ; INFRARED CIRRUS ; DARK CLOUDS ; DENSE CORES ; GAS ; TRANSLUCENT ; TURBULENCE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000709102800001
资助机构	NSFC ; China Ministry of Science and Technology ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Science Foundation
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/4307]
专题	恒星形成与演化研究团组
通讯作者	Xu, Fengwei
作者单位	1.Natl Taiwan Univ NTU, Taipei, Taiwan 2.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China 3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 4.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 5.Korea Astron & Space Sci Inst, 776 Daedeokdaero, Daejeon 34055, South Korea 6.Yunnan Univ, Dept Astron, Kunming 650091, Yunnan, Peoples R China 7.Key Lab Astroparticle Phys Yunnan Prov, Kunming 650091, Yunnan, Peoples R China 8.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 9.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China 10.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab FAST, Beijing 100012, Peoples R 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]. ASTROPHYSICAL JOURNAL,2021,920(2):29.
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.ASTROPHYSICAL JOURNAL,920(2),29.
MLA	Xu, Fengwei,et al."Planck Galactic Cold Clumps at High Galactic Latitude-a Study with CO Lines".ASTROPHYSICAL JOURNAL 920.2(2021):29.