ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Detection of Extremely High-density Compact Structure of Prestellar Cores and Multiple Substructures Within

doi:10.3847/2041-8213/abd3aa

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	ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Detection of Extremely High-density Compact Structure of Prestellar Cores and Multiple Substructures Within
	Sahu, Dipen 30; Liu, Sheng-Yuan 30; Liu, Tie 29; Evans II, Neal J.28; Hirano, Naomi 30; Tatematsu, Ken'ichi 3,33; Lee, Chin-Fei 30; Kim, Kee-Tae 26,27; Dutta, Somnath 30; Alina, Dana 25
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2021
卷号	907 期号:1 页码:L15
关键词	Molecular clouds Collapsing clouds Star-forming regions Star formation Protostars
ISSN号	2041-8205
DOI	10.3847/2041-8213/abd3aa
产权排序	33
英文摘要	Prestellar cores are self-gravitating dense and cold structures within molecular clouds where future stars are born. They are expected, at the stage of transitioning to the protostellar phase, to harbor centrally concentrated dense (sub)structures that will seed the formation of a new star or the binary/multiple stellar systems. Characterizing this critical stage of evolution is key to our understanding of star formation. In this work, we report the detection of high-density (sub)structures on the thousand-astronomical-unit (au) scale in a sample of dense prestellar cores. Through our recent ALMA observations toward the Orion Planck Galactic Cold Clumps, we have found five extremely dense prestellar cores, which have centrally concentrated regions of similar to 2000 au in size, and several 10(7) cm(-3) in average density. Masses of these centrally dense regions are in the range of 0.30 to 6.89 M. For the first time, our higher resolution observations (0.8 '' similar to 320 au) further reveal that one of the cores shows clear signatures of fragmentation; such individual substructures/fragments have sizes of 800-1700 au, masses of 0.08 to 0.84 M, densities of 2 - 8 x 10(7) cm(-3), and separations of similar to 1200 au. The substructures are massive enough (greater than or similar to 0.1 M) to form young stellar objects and are likely examples of the earliest stage of stellar embryos that can lead to widely (similar to 1200 au) separated multiple systems.
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资助项目	Ministry of Science and Technology (MoST)[108-2112-M-001-048-] ; Ministry of Science and Technology (MoST)[108-2112-M-001-052-] ; international partnership program of the Chinese Academy of Sciences[114231KYSB20200009] ; National Natural Science Foundation of China (NSFC)[12073061] ; Shanghai Pujiang Program[20PJ1415500] ; ANID[AFB 170002] ; ANID[AFB-170002] ; National Natural Science Foundation of China[U1631237] ; NRC Canada ; NSERC Discovery Grant ; Spanish MINECO[AYA2017-88754-P] ; State Agency for Research of the Spanish Ministry of Science and Innovation through the Unit of Excellence Maria de Maeztu 2020-2023 award[CEX2019-000918-M] ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology[NRF-2019R1A2C1010851] ; NSF[AST-1715876] ; NSFC[11911530226] ; NSFC[11725313] ; NSFC[11873086] ; JSPS KAKENHI[20H05645] ; Yunnan Province of China[2017HC018] ; Chinese Academy of Sciences (CAS) ; [MoST 108-2112-M-001-017] ; [MoST 109-2112-M-001-023]
WOS关键词	STAR-FORMATION ; FRAGMENTATION ; MASS ; CLOUDS ; SYSTEM
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000608871700001
资助机构	Ministry of Science and Technology (MoST) ; international partnership program of the Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; Shanghai Pujiang Program ; ANID ; National Natural Science Foundation of China ; NRC Canada ; NSERC Discovery Grant ; Spanish MINECO ; State Agency for Research of the Spanish Ministry of Science and Innovation through the Unit of Excellence Maria de Maeztu 2020-2023 award ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology ; NSF ; NSFC ; JSPS KAKENHI ; Yunnan Province of China ; Chinese Academy of Sciences (CAS)
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/3820]
专题	恒星形成与演化研究团组
通讯作者	Sahu, Dipen; Liu, Sheng-Yuan; Liu, Tie
作者单位	1.Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA 2.CAS Urumqi, Xinjiang Astron Observ, Xinjiang, CN, Peoples R China 3.Natl Inst Nat Sci, Natl Astron Observ Japan, Nobeyama Radio Observ, Minamisa Ku, 462-2 Nobeyama, Minamimaki, Nagano 3841305, Japan 4.Univ Toulouse, UPS OMP, IRAP, F-31028 Toulouse 4, France 5.Key Lab Particle Astrophys Yunnan Prov, Kunming 650091, Yunnan, Peoples R China 6.Yunnan Univ, Dept Astron, Kunming 650091, Yunnan, Peoples R China 7.Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti & Franques 1, E-08028 Barcelona, Spain 8.Univ Bourgogne Franche Comte, Inst UTINAM, OSU THETA, CNRS,UMR 6213, 41Bis Ave Observ, F-25000 Besancon, France 9.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA 10.Univ KwaZulu Natal, NAOC UKZN Computat Astrophys Ctr, ZA-4000 Durban, South Africa
推荐引用方式 GB/T 7714	Sahu, Dipen,Liu, Sheng-Yuan,Liu, Tie,et al. ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Detection of Extremely High-density Compact Structure of Prestellar Cores and Multiple Substructures Within[J]. ASTROPHYSICAL JOURNAL LETTERS,2021,907(1):L15.
APA	Sahu, Dipen.,Liu, Sheng-Yuan.,Liu, Tie.,Evans II, Neal J..,Hirano, Naomi.,...&Zhou, Jianjun.(2021).ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Detection of Extremely High-density Compact Structure of Prestellar Cores and Multiple Substructures Within.ASTROPHYSICAL JOURNAL LETTERS,907(1),L15.
MLA	Sahu, Dipen,et al."ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Detection of Extremely High-density Compact Structure of Prestellar Cores and Multiple Substructures Within".ASTROPHYSICAL JOURNAL LETTERS 907.1(2021):L15.