Universität zu Köln

Xu, Fengwei ORCID: 0000-0001-5950-1932, Wu, Yuefang, Liu, Tie, Liu, Xunchuan, Zhang, Chao, Esimbek, Jarken, Qin, Sheng-Li ORCID: 0000-0003-2302-0613, Li, Di ORCID: 0000-0003-3010-7661, Wang, Ke, Yuan, Jinghua, Meng, Fanyi, Zhang, Tianwei, Eden, David ORCID: 0000-0002-5881-3229, Tatematsu, K., Evans, Neal J., Goldsmith, Paul. F., Zhang, Qizhou ORCID: 0000-0003-2384-6589, Henkel, C., Yi, Hee-Weon, Lee, Jeong-Eun, Saajasto, Mika, Kim, Gwanjeong, Juvela, Mika ORCID: 0000-0002-5809-4834, Sahu, Dipen, Hsu, Shih-Ying, Liu, Sheng-Yuan, Dutta, Somnath ORCID: 0000-0002-2338-4583, Lee, Chin-Fei ORCID: 0000-0002-3024-5864, Zhang, Chuan-Peng, Xu, Ye and Ju, Binggang (2021). Planck Galactic Cold Clumps at High Galactic Latitude-a Study with CO Lines. Astrophys. J., 920 (2). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357

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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; 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Xu, Fengwei UNSPECIFIED orcid.org/0000-0001-5950-1932 UNSPECIFIED Wu, Yuefang UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Tie UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Xunchuan UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhang, Chao UNSPECIFIED UNSPECIFIED UNSPECIFIED Esimbek, Jarken UNSPECIFIED UNSPECIFIED UNSPECIFIED Qin, Sheng-Li UNSPECIFIED orcid.org/0000-0003-2302-0613 UNSPECIFIED Li, Di UNSPECIFIED orcid.org/0000-0003-3010-7661 UNSPECIFIED Wang, Ke UNSPECIFIED UNSPECIFIED UNSPECIFIED Yuan, Jinghua UNSPECIFIED UNSPECIFIED UNSPECIFIED Meng, Fanyi UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhang, Tianwei UNSPECIFIED UNSPECIFIED UNSPECIFIED Eden, David UNSPECIFIED orcid.org/0000-0002-5881-3229 UNSPECIFIED Tatematsu, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Evans, Neal J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goldsmith, Paul. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhang, Qizhou UNSPECIFIED orcid.org/0000-0003-2384-6589 UNSPECIFIED Henkel, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yi, Hee-Weon UNSPECIFIED UNSPECIFIED UNSPECIFIED Lee, Jeong-Eun UNSPECIFIED UNSPECIFIED UNSPECIFIED Saajasto, Mika UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Gwanjeong UNSPECIFIED UNSPECIFIED UNSPECIFIED Juvela, Mika UNSPECIFIED orcid.org/0000-0002-5809-4834 UNSPECIFIED Sahu, Dipen UNSPECIFIED UNSPECIFIED UNSPECIFIED Hsu, Shih-Ying UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Sheng-Yuan UNSPECIFIED UNSPECIFIED UNSPECIFIED Dutta, Somnath UNSPECIFIED orcid.org/0000-0002-2338-4583 UNSPECIFIED Lee, Chin-Fei UNSPECIFIED orcid.org/0000-0002-3024-5864 UNSPECIFIED Zhang, Chuan-Peng UNSPECIFIED UNSPECIFIED UNSPECIFIED Xu, Ye UNSPECIFIED UNSPECIFIED UNSPECIFIED Ju, Binggang UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-605633
DOI:	10.3847/1538-4357/ac1686
Journal or Publication Title:	Astrophys. J.
Volume:	920
Number:	2
Date:	2021
Publisher:	IOP Publishing Ltd
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLECULAR CLOUDS; CARBON-MONOXIDE; STAR-FORMATION; H-I; INFRARED CIRRUS; DARK CLOUDS; DENSE CORES; GAS; TRANSLUCENT; TURBULENCE Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/60563