Institutional Repository of Radio Astronomy Research Laboratory
| Physical properties and chemical composition of the cores in the California molecular cloud | |
Zhang, Guo-Yin1,2; Xu, Jin-Long1; Vasyunin, A. I.3,4; Semenov, D. A.5,6; Wang, Jun-Jie1; Dib, Sami6,7; Liu, Tie8,9; Liu, Sheng-Yuan10; Zhang, Chuan-Peng1,6; Liu, Xiao-Lan1; Wang, Ke11,12; Li, Di1,13; Wu, Zhong-Zu14; Yuan, Jing-Hua1; Li, Da-Lei15 ; Gao, Yang16
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| 2018-12-14 | |
| Source Publication | ASTRONOMY & ASTROPHYSICS
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| ISSN | 1432-0746 |
| Volume | 620Pages:A163 |
| Contribution Rank | 15 |
| Abstract | 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. |
| Keyword | stars: formation ISM: abundances astrochemistry dust, extinction ISM: molecules |
| DOI | 10.1051/0004-6361/201833622 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | INITIAL MASS FUNCTION ; INTERSTELLAR-MEDIUM ; STAR-FORMATION ; CLUMP IDENTIFICATION ; STELLAR CLUSTERS ; THERMAL BALANCE ; INFALL MOTIONS ; DARK CLOUDS ; CHEMISTRY ; HCN |
| Funding Project | National Natural Science Foundation of China[11703040] ; National Key R&D Program of China[2017YFA0402600] ; National Natural Science Foundation of China[11703074] ; National Key R&D Program of China[2017YFA0402702] ; National Key Basic Research Program of China (973 Program)[2015CB857101] ; 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 Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:000453300100001 |
| Publisher | EDP SCIENCES S A |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/2359 |
| Collection | 射电天文研究室_恒星形成与演化研究团组 110米口径全可动射电望远镜（QTT）_110米大口径全可动射电望远镜关键技术研究（973项目）_课题1：大样本射电天体的观测和前沿问题研究 |
| Corresponding Author | Zhang, Guo-Yin |
| Affiliation | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Ural Fed Univ, Ekaterinburg, Russia 4.Ventspils Univ Appl Sci, Ventspils Int Radio Astron Ctr, Engn Res Inst, Inzenieru 101, LV-3601 Ventspils, Latvia 5.Ludwig Maximilians Univ Munchen, Dept Chem, Butenandtstr 5-13, D-81377 Munich, Germany 6.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany 7.Niels Bohr Int Acad, Niels Bohr Inst, Blegdamsvej 17, DK-2100 Copenhagen O, Denmark 8.Korea Astron & Space Sci Inst, 776 Daedeokdaero, Daejeon 34055, South Korea 9.East Asian Observ, 660 N Aohoku Pl, Hilo, HI 96720 USA 10.Acad Sinica, Inst Astron & Astrophys, 11F Astron Math Bldg,AS NTU 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan 11.Peking Univ, Kavli Inst Astron & Astrophys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China 12.European Southern Observ ESO Headquarters, Karl Schwarzschild Str 2, D-85748 Garching, Germany 13.Chinese Acad Sci, NAOC, CAS Key Lab FAST, Beijing 100101, Peoples R China 14.Guizhou Univ, Coll Phys, Guiyang 550025, Guizhou, Peoples R China 15.Chinese Acad Sci, Xinjiang Astron Observ, 150,Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 16.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Guangdong, Peoples R China |
| Recommended Citation 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:A163. |
| 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,A163. |
| MLA | Zhang, Guo-Yin,et al."Physical properties and chemical composition of the cores in the California molecular cloud".ASTRONOMY & ASTROPHYSICS 620(2018):A163. |
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| Zhang-2018-Physical （3312KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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