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350 mu m map of the Ophiuchus molecular cloud: core mass function
Zhang GuoYin1,2; Li Di2,3,4,5; Hyde, Ashley K.6; Qian Lei3; Lyu HuaLei3; Wu ZhongZu1
AbstractStars are born in dense cores of molecular clouds. The core mass function (CMF), which is the mass distribution of dense cores, is important for understanding the stellar initial mass function (IMF). We obtained 350 mu m dust continuum data using the SHARC-II camera at the Caltech Submillimeter Observatory (CSO) telescope. A 350 mu m map covering 0.25 deg(2) of the Ophiuchus molecular cloud was created by mosaicing 56 separate scans. The CSO telescope had an angular resolution of 9 '', corresponding to 1.2 x 10(3) AU at the distance of the Ophiuchus molecular cloud (131 pc). The data was reduced using the Comprehensive Reduction Utility for SHARC-II (CRUSH). The flux density map was analyzed using the GaussClumps algorithm, within which 75 cores has been identified. We used the Spitzer c2d catalogs to separate the cores into 63 starless cores and 12 protostellar cores. By locating Jeans instabilities, 55 prestellar cores (a subcategory of starless cores) were also identified. The excitation temperatures, which were derived from FCRAO (CO)-C-12 data, help to improve the accuracy of the masses of the cores. We adopted a Monte Carlo approach to analyze the CMF with two types of functional forms; power law and log-normal. The whole and prestellar CMF are both well fitted by a log-normal distribution, with mu = -1.18 +/- 0.10, sigma = 0.58 +/- 0.05 and mu = 1.40 +/- 0.10, s = 0.50 +/- 0.05 respectively. This finding suggests that turbulence influences the evolution of the Ophiuchus molecular cloud.
KeywordIsm Molecular Clouds Ophiuchus Cmf
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000349872700015
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Guizhou Univ, Coll Sci, Dept Phys, Guiyang 550025, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
4.Space Sci Inst, Boulder, CO USA
5.CALTECH, Dept Astron, Pasadena, CA 91125 USA
6.Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Astrophys Grp, London, England
Recommended Citation
GB/T 7714
Zhang GuoYin,Li Di,Hyde, Ashley K.,et al. 350 mu m map of the Ophiuchus molecular cloud: core mass function[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2015,58(2).
APA Zhang GuoYin,Li Di,Hyde, Ashley K.,Qian Lei,Lyu HuaLei,&Wu ZhongZu.(2015).350 mu m map of the Ophiuchus molecular cloud: core mass function.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,58(2).
MLA Zhang GuoYin,et al."350 mu m map of the Ophiuchus molecular cloud: core mass function".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 58.2(2015).
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