中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
(CO)-C-13 CORES IN THE TAURUS MOLECULAR CLOUD

文献类型:期刊论文

作者Qian, Lei1; Li, Di1,2,4; Goldsmith, Paul F.3
刊名ASTROPHYSICAL JOURNAL
出版日期2012-12-01
卷号760期号:2
关键词ISM: clouds ISM: individual objects (Taurus) ISM: molecules turbulence
英文摘要Young stars form in molecular cores, which are dense condensations within molecular clouds. We have searched for molecular cores traced by (CO)-C-13 J = 1 -> 0 emission in the Taurus molecular cloud and studied their properties. Our data set has a spatial dynamic range (the ratio of linear map size to the pixel size) of about 1000 and spectrally resolved velocity information, which together allow a systematic examination of the distribution and dynamic state of (CO)-C-13 cores in a large contiguous region. We use empirical fit to the CO and CO2 ice to correct for depletion of gas-phase CO. The (CO)-C-13 core mass function ((CO)-C-13 CMF) can be fitted better with a log-normal function than with a power-law function. We also extract cores and calculate the (CO)-C-13 CMF based on the integrated intensity of (CO)-C-13 and the CMF from Two Micron All Sky Survey. We demonstrate that core blending exists, i.e., combined structures that are incoherent in velocity but continuous in column density. The core velocity dispersion (CVD), which is the variance of the core velocity difference delta nu, exhibits a power-law behavior as a function of the apparent separation L: CVD (km s(-1)) proportional to L(pc)(0.7). This is similar to Larson's law for the velocity dispersion of the gas. The peak velocities of (CO)-C-13 cores do not deviate from the centroid velocities of the ambient (CO)-C-12 gas by more than half of the line width. The low velocity dispersion among cores, the close similarity between CVD and Larson's law, and the small separation between core centroid velocities and the ambient gas all suggest that molecular cores condense out of the diffuse gas without additional energy from star formation or significant impact from converging flows.
收录类别SCI
语种英语
WOS记录号WOS:000311217000051
源URL[http://ir.bao.ac.cn/handle/114a11/6332]  
专题国家天文台_射电天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.CALTECH, Dept Astron, Pasadena, CA 91125 USA
3.CALTECH, Jet Prop Lab, Pasadena, CA USA
4.Space Sci Inst, Boulder, CO USA
推荐引用方式
GB/T 7714
Qian, Lei,Li, Di,Goldsmith, Paul F.. (CO)-C-13 CORES IN THE TAURUS MOLECULAR CLOUD[J]. ASTROPHYSICAL JOURNAL,2012,760(2).
APA Qian, Lei,Li, Di,&Goldsmith, Paul F..(2012).(CO)-C-13 CORES IN THE TAURUS MOLECULAR CLOUD.ASTROPHYSICAL JOURNAL,760(2).
MLA Qian, Lei,et al."(CO)-C-13 CORES IN THE TAURUS MOLECULAR CLOUD".ASTROPHYSICAL JOURNAL 760.2(2012).

入库方式: OAI收割

来源:国家天文台

浏览0
下载0
收藏0
其他版本

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。