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The Properties of Planck Galactic Cold Clumps in the L1495 Dark Cloud

文献类型：期刊论文

作者Tang, Mengyao1,2; Liu, Tie3,4,5; Qin, Sheng-Li1,2; Kim, Kee-Tae3,4; Wu, Yuefang6; Tatematsu, Ken'ichi7; Yuan, Jinghua8; Wang, Ke9; Parsons, Harriet5; Koch, Patrick M.10
刊名ASTROPHYSICAL JOURNAL
出版日期2018-04-01
卷号856期号:2页码:21
ISSN号0004-637X
关键词ISM: clouds ISM: individual objects (L1495) ISM: molecules stars: formation
DOI10.3847/1538-4357/aaadad
英文摘要Planck Galactic Cold Clumps (PGCCs) possibly represent the early stages of star formation. To understand better the properties of PGCCs, we studied 16 PGCCs in the L1495 cloud with molecular lines and continuum data from Herschel, JCMT/SCUBA-2, and the PMO 13.7 m telescope. Thirty dense cores were identified in 16 PGCCs from 2D Gaussian fitting. The dense cores have dust temperatures of T-d = 11-14 K, and H-2 column densities of NH2 = (0.36-2.5) x 10(22) cm(-2). We found that not all PGCCs contain prestellar objects. In general, the dense cores in PGCCs are usually at their earliest evolutionary stages. All the dense cores have non-thermal velocity dispersions larger than the thermal velocity dispersions from molecular line data, suggesting that the dense cores may be turbulence-dominated. We have calculated the virial parameter a and found that 14 of the dense cores have alpha < 2, while 16 of the dense cores have alpha > 2. This suggests that some of the dense cores are not bound in the absence of external pressure and magnetic fields. The column density profiles of dense cores were fitted. The sizes of the flat regions and core radii decrease with the evolution of dense cores. CO depletion was found to occur in all the dense cores, but is more significant in prestellar core candidates than in protostellar or starless cores. The protostellar cores inside the PGCCs are still at a very early evolutionary stage, sharing similar physical and chemical properties with the prestellar core candidates.
WOS关键词GOULD BELT SURVEY ; CLERK MAXWELL TELESCOPE ; MOLECULAR CLOUD ; STAR-FORMATION ; DENSE CORES ; SCUBA-2 OBSERVATIONS ; PROTOSTELLAR CORES ; PRESTELLAR CORES ; TAURUS ; JCMT
资助项目National Key R&D Program of China[2017YFA0402701] ; National Natural Science Foundation of China (NSFC)[U1631237] ; Top Talents Program of Yunnan Province[2015HA030] ; KASI fellowship ; EACOA fellowship ; German Research Foundation (DFG)[WA3628-1/1] ; German Research Foundation (DFG)[1573] ; OTKA[NN-111016] ; Science and Technology Facilities Council of the United Kingdom ; Canada Foundation for Innovation ; Chinese Academy of Sciences (CAS)[U1631237] ; Chinese Academy of Sciences[XDB09000000]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000429040600015
资助机构National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; Top Talents Program of Yunnan Province ; KASI fellowship ; EACOA fellowship ; German Research Foundation (DFG) ; OTKA ; Science and Technology Facilities Council of the United Kingdom ; Canada Foundation for Innovation ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; Top Talents Program of Yunnan Province ; KASI fellowship ; EACOA fellowship ; German Research Foundation (DFG) ; OTKA ; Science and Technology Facilities Council of the United Kingdom ; Canada Foundation for Innovation ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; Top Talents Program of Yunnan Province ; KASI fellowship ; EACOA fellowship ; German Research Foundation (DFG) ; OTKA ; Science and Technology Facilities Council of the United Kingdom ; Canada Foundation for Innovation ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; Top Talents Program of Yunnan Province ; KASI fellowship ; EACOA fellowship ; German Research Foundation (DFG) ; OTKA ; Science and Technology Facilities Council of the United Kingdom ; Canada Foundation for Innovation ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences
源URL[http://ir.bao.ac.cn/handle/114a11/35603]  
专题中国科学院国家天文台
通讯作者Tang, Mengyao
作者单位1.Yunnan Univ, Dept Astron, Kunming 650091, Yunnan, Peoples R China
2.Key Lab Astroparticle Phys Yunnan Prov, Kunming 650091, Yunnan, Peoples R China
3.Korea Astron, 776 Daedeokdaero, Daejeon 34055, South Korea
4.Space Sci Inst, 776 Daedeokdaero, Daejeon 34055, South Korea
5.East Asian Observ, 660 N Aohoku Pl, Hilo, HI 96720 USA
6.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
7.Natl Inst Nat Sci, Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
8.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
9.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
10.Acad Sinica, Inst Astron & Astrophys, Taipei, Taiwan
推荐引用方式
GB/T 7714		 Tang, Mengyao,Liu, Tie,Qin, Sheng-Li,et al. The Properties of Planck Galactic Cold Clumps in the L1495 Dark Cloud[J]. ASTROPHYSICAL JOURNAL,2018,856(2):21.
APA Tang, Mengyao.,Liu, Tie.,Qin, Sheng-Li.,Kim, Kee-Tae.,Wu, Yuefang.,...&Cunningham, M. R..(2018).The Properties of Planck Galactic Cold Clumps in the L1495 Dark Cloud.ASTROPHYSICAL JOURNAL,856(2),21.
MLA Tang, Mengyao,et al."The Properties of Planck Galactic Cold Clumps in the L1495 Dark Cloud".ASTROPHYSICAL JOURNAL 856.2(2018):21.

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