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:
CreatorsEmailORCIDORCID Put Code
Xu, FengweiUNSPECIFIEDorcid.org/0000-0001-5950-1932UNSPECIFIED
Wu, YuefangUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liu, TieUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liu, XunchuanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zhang, ChaoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Esimbek, JarkenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Qin, Sheng-LiUNSPECIFIEDorcid.org/0000-0003-2302-0613UNSPECIFIED
Li, DiUNSPECIFIEDorcid.org/0000-0003-3010-7661UNSPECIFIED
Wang, KeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yuan, JinghuaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meng, FanyiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zhang, TianweiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eden, DavidUNSPECIFIEDorcid.org/0000-0002-5881-3229UNSPECIFIED
Tatematsu, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Evans, Neal J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goldsmith, Paul. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zhang, QizhouUNSPECIFIEDorcid.org/0000-0003-2384-6589UNSPECIFIED
Henkel, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yi, Hee-WeonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, Jeong-EunUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Saajasto, MikaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kim, GwanjeongUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Juvela, MikaUNSPECIFIEDorcid.org/0000-0002-5809-4834UNSPECIFIED
Sahu, DipenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hsu, Shih-YingUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liu, Sheng-YuanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dutta, SomnathUNSPECIFIEDorcid.org/0000-0002-2338-4583UNSPECIFIED
Lee, Chin-FeiUNSPECIFIEDorcid.org/0000-0002-3024-5864UNSPECIFIED
Zhang, Chuan-PengUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Xu, YeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ju, BinggangUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
MOLECULAR CLOUDS; CARBON-MONOXIDE; STAR-FORMATION; H-I; INFRARED CIRRUS; DARK CLOUDS; DENSE CORES; GAS; TRANSLUCENT; TURBULENCEMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60563

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