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350 μm map of the Ophiuchus molecular cloud: core mass function

Zhang, Guo Yin and Li, Di and Hyde, Ashley K. and Qian, Lei and Lyu, Hua Lei and Wu, Zhong Zu (2014) 350 μm map of the Ophiuchus molecular cloud: core mass function. Science China Physics, Mechanics and Astronomy, 58 (2). pp. 1-11. ISSN 1674-7348. doi:10.1007/s11433-014-5561-7.

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Stars 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 μm dust continuum data using the SHARC-II camera at the Caltech Submillimeter Observatory (CSO) telescope. A 350 μm 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 × 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 ^(12)CO 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 µ = −1.18 ± 0.10, σ = 0.58 ± 0.05 and µ = 1.40 ± 0.10, σ = 0.50 ± 0.05 respectively. This finding suggests that turbulence influences the evolution of the Ophiuchus molecular cloud.

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Additional Information:© 2014 Science China Press and Springer-Verlag Berlin Heidelberg. Received July 29, 2013; accepted February 27, 2014; published online July 23, 2014. This material is based upon work at the Caltech Submillimeter Observatory, which is operated by the California Institute of Technology under cooperative agreement with the National Science Foundation (Grant No. AST-0838261). This work was supported by National Basic Research Program of China (Grant No. 2012CB821800), National Aeronautics and Space Administration Undergraduate Student Research Program of USA, National Natural Science Foundation of China (Grant Nos. 11373038 and 11163002), Graduate Innovative Fund of GuiZhou University (Grant Nos. 2013024). This research was carried out at the NAOC ISM Group. We would to thank TAFALLAM. for useful discussions on this paper. We thank BERRY D.S. and DRAPER P.W. for their technical support with STARLINK. Special acknowledgement is also given to ZHOU A.Y.
Funding AgencyGrant Number
National Basic Research Program of China2012CB821800
NASA Undergraduate Student Research ProgramUNSPECIFIED
National Natural Science Foundation of China11373038
National Natural Science Foundation of China11163002
GuiZhou University Graduate Innovative Fund2013024
Subject Keywords: ISM molecular clouds Ophiuchus CMF 029701
Issue or Number:2
Classification Code:PACS: 97.10.Bt, 97.10.Xq, 98.38.Dq
Record Number:CaltechAUTHORS:20150325-085049809
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Official Citation:Zhang G Y, Li D, Hyde A K, et al. 350 μm map of the Ophiuchus molecular cloud: core mass function. Sci China-Phys Mech Astron, 2015, 58: 029701, doi: 10.1007/s11433-014-5561-7
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56055
Deposited By: Ruth Sustaita
Deposited On:25 Mar 2015 16:28
Last Modified:10 Nov 2021 20:53

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