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典型文献
A Catalog of Molecular Clumps and Cores with Infall Signatures
文献摘要:
The research of infall motion is a common means to study molecular cloud dynamics and the early process of star formation. Many works had been done in-depth research on infall. We searched the literature related to infall study of molecular cloud since 1994, summarized the infall sources identified by the authors. A total of 456 infall sources are cataloged. We classify them into high-mass and low-mass sources, in which the high-mass sources are divided into three evolutionary stages:prestellar, protostellar and H Ⅱ region. We divide the sources into clumps and cores according to their sizes. The H2 column density values range from 1.21 × 1021 to 9.75 × 1024 cm?2, with a median value of 4.17 × 1022 cm?2. The H2 column densities of high-mass and low-mass sources are significantly separated. The median value of infall velocity for high-mass clumps is 1.12 km s?1, and the infall velocities of low-mass cores are virtually all less than 0.5 km s?1. There is no obvious difference between different stages of evolution. The mass infall rates of low-mass cores are between 10?7 and 10?4 Meyr?1, and those of high-mass clumps are between 10?4 and 10?1 Meyr?1 with only one exception. We do not find that the mass infall rates vary with evolutionary stages.
文献关键词:
作者姓名:
Shuling Yu;Zhibo Jiang;Yang Yang;Zhiwei Chen;Haoran Feng
作者机构:
Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China;University of Science and Technology of China,Chinese Academy of Sciences,Hefei 230026,China;Center for Astronomy and Space Sciences,Three Gorges University,Yichang 443002,China
引用格式:
[1]Shuling Yu;Zhibo Jiang;Yang Yang;Zhiwei Chen;Haoran Feng-.A Catalog of Molecular Clumps and Cores with Infall Signatures)[J].天文和天体物理学研究,2022(09):152-175
A类:
Clumps,Cores,Infall,infall,cataloged,prestellar,protostellar,clumps,Meyr
B类:
Catalog,Molecular,Signatures,research,motion,is,common,means,study,molecular,cloud,dynamics,early,process,star,formation,Many,works,had,been,done,depth,We,searched,literature,related,since,summarized,sources,identified,by,authors,total,are,classify,them,into,high,mass,low,which,divided,three,evolutionary,stages,region,cores,according,their,sizes,H2,column,density,values,range,from,median,densities,significantly,separated,velocity,velocities,virtually,less,than,There,obvious,difference,between,different,rates,those,only,exception,not,find,that,vary
AB值:
0.397159
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