Physical properties and chemical composition of the cores in the California molecular cloud

doi:10.1051/0004-6361/201833622

CORC > 国家天文台 > 中国科学院国家天文台

	Physical properties and chemical composition of the cores in the California molecular cloud
	Zhang, Guo-Yin 12,13; Xu, Jin-Long 12; Vasyunin, A. I.14,15; Semenov, D. A.1,16; Wang, Jun-Jie 12; Dib, Sami 1,2; Liu, Tie 3,4; Liu, Sheng-Yuan 5; Zhang, Chuan-Peng 1,12; Liu, Xiao-Lan 12
刊名	ASTRONOMY & ASTROPHYSICS
	2018-12-14
卷号	620 页码:22
关键词	stars: formation ISM: abundances astrochemistry dust, extinction ISM: molecules
ISSN号	1432-0746
DOI	10.1051/0004-6361/201833622
英文摘要	Aims. We aim to reveal the physical properties and chemical composition of the cores in the California molecular cloud (CMC), so as to better understand the initial conditions of star formation. Methods. We made a high-resolution column density map (18.2'') with Herschel data, and extracted a complete sample of the cores in the CMC with the fellwalker algorithm. We performed new single-pointing observations of molecular lines near 90 GHz with the IRAM 30m telescope along the main filament of the CMC. In addition, we also performed a numerical modeling of chemical evolution for the cores under the physical conditions. Results. We extracted 300 cores, of which 33 are protostellar and 267 are starless cores. About 51% (137 of 267) of the starless cores are prestellar cores. Three cores have the potential to evolve into high-mass stars. The prestellar core mass function (CMF) can be well fit by a log-normal form. The high-mass end of the prestellar CMF shows a power-law form with an index alpha = -0.9 +/- 0.1 that is shallower than that of the Galactic field stellar mass function. Combining the mass transformation efficiency (epsilon) from the prestellar core to the star of 15 +/- 1% and the core formation efficiency (CFE) of 5.5%, we suggest an overall star formation efficiency of about 1% in the CMC. In the single-pointing observations with the IRAM 30m telescope, we find that 6 cores show blue-skewed profile, while 4 cores show red-skewed profile. [HCO+]/[HNC] and [HCO+]/[N2H+] in protostellar cores are higher than those in prestellar cores; this can be used as chemical clocks. The best-fit chemical age of the cores with line observations is similar to 5 x 10(4) yr.
资助项目	National Key R&D Program of China[2017YFA0402600] ; National Key R&D Program of China[2017YFA0402702] ; National Key Basic Research Program of China (973 Program)[2015CB857101] ; National Natural Science foundation of China[11703040] ; National Natural Science foundation of China[11703074] ; National Natural Science foundation of China[11721303] ; National Natural Science foundation of China[11763002] ; National Natural Science foundation of China[U1431111] ; Chinese Government Scholarship[201804910583] ; Heidelberg Institute of Theoretical Studies ; Russian Science Foundation[18-12-00351] ; German Research Foundation[WA3628-1/1]
WOS关键词	INITIAL MASS FUNCTION ; INTERSTELLAR-MEDIUM ; STAR-FORMATION ; CLUMP IDENTIFICATION ; STELLAR CLUSTERS ; THERMAL BALANCE ; INFALL MOTIONS ; DARK CLOUDS ; CHEMISTRY ; HCN
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000453300100001
资助机构	National Key R&D Program of China ; National Key R&D Program of China ; National Key Basic Research Program of China (973 Program) ; National Key Basic Research Program of China (973 Program) ; National Natural Science foundation of China ; National Natural Science foundation of China ; Chinese Government Scholarship ; Chinese Government Scholarship ; Heidelberg Institute of Theoretical Studies ; Heidelberg Institute of Theoretical Studies ; Russian Science Foundation ; Russian Science Foundation ; German Research Foundation ; German Research Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; National Key Basic Research Program of China (973 Program) ; National Key Basic Research Program of China (973 Program) ; National Natural Science foundation of China ; National Natural Science foundation of China ; Chinese Government Scholarship ; Chinese Government Scholarship ; Heidelberg Institute of Theoretical Studies ; Heidelberg Institute of Theoretical Studies ; Russian Science Foundation ; Russian Science Foundation ; German Research Foundation ; German Research Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; National Key Basic Research Program of China (973 Program) ; National Key Basic Research Program of China (973 Program) ; National Natural Science foundation of China ; National Natural Science foundation of China ; Chinese Government Scholarship ; Chinese Government Scholarship ; Heidelberg Institute of Theoretical Studies ; Heidelberg Institute of Theoretical Studies ; Russian Science Foundation ; Russian Science Foundation ; German Research Foundation ; German Research Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; National Key Basic Research Program of China (973 Program) ; National Key Basic Research Program of China (973 Program) ; National Natural Science foundation of China ; National Natural Science foundation of China ; Chinese Government Scholarship ; Chinese Government Scholarship ; Heidelberg Institute of Theoretical Studies ; Heidelberg Institute of Theoretical Studies ; Russian Science Foundation ; Russian Science Foundation ; German Research Foundation ; German Research Foundation
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/23912]
专题	中国科学院国家天文台
通讯作者	Zhang, Guo-Yin
作者单位	1.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany 2.Niels Bohr Int Acad, Niels Bohr Inst, Blegdamsvej 17, DK-2100 Copenhagen O, Denmark 3.Korea Astron & Space Sci Inst, 776 Daedeokdaero, Daejeon 34055, South Korea 4.East Asian Observ, 660 N Aohoku Pl, Hilo, HI 96720 USA 5.Acad Sinica, Inst Astron & Astrophys, 11F Astron Math Bldg,AS NTU 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan 6.Peking Univ, Kavli Inst Astron & Astrophys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China 7.European Southern Observ ESO Headquarters, Karl Schwarzschild Str 2, D-85748 Garching, Germany 8.Chinese Acad Sci, NAOC, CAS Key Lab FAST, Beijing 100101, Peoples R China 9.Guizhou Univ, Coll Phys, Guiyang 550025, Guizhou, Peoples R China 10.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Guo-Yin,Xu, Jin-Long,Vasyunin, A. I.,et al. Physical properties and chemical composition of the cores in the California molecular cloud[J]. ASTRONOMY & ASTROPHYSICS,2018,620:22.
APA	Zhang, Guo-Yin.,Xu, Jin-Long.,Vasyunin, A. I..,Semenov, D. A..,Wang, Jun-Jie.,...&Gao, Yang.(2018).Physical properties and chemical composition of the cores in the California molecular cloud.ASTRONOMY & ASTROPHYSICS,620,22.
MLA	Zhang, Guo-Yin,et al."Physical properties and chemical composition of the cores in the California molecular cloud".ASTRONOMY & ASTROPHYSICS 620(2018):22.