典型文献
Revisiting the Mass–Size Relation of Structures in Molecular Clouds
文献摘要：
We revisit the mass-size relation of molecular cloud structures based on the column density map of the Cygnus-X molecular cloud complex. We extract 135 column density peaks in Cygnus-X and analyze the column density distributions around these peaks. The averaged column density profiles, N(R), around all the peaks can be well fitted with broken power-laws, which are described by an inner power-law index n, outer power-law index m, and the radius RTP and column density NTP at the transition point. We then explore the M-R relation with different samples of cloud structures by varying the N(R) parameters and the column density threshold, N0, which determines the boundary of a cloud structure. We find that only when N0 has a wide range of values, the M-R relation may largely probe the density distribution, and the fitted power-law index of the M-R relation is related to the power-law index of N(R). On the contrary, with a constant N0, the M-R relation has no direct connection with the density distribution;in this case, the fitted power-law index of the M-R relation is equal to 2 (when N0≥NTP and n has a narrow range of values), larger than 2 (when N0≥NTP and n has a wide range of values), or slightly less than 2 (when N0
文献关键词：
中图分类号：
作者姓名：
Yuchen Xing;Keping Qiu
作者机构：
School of Astronomy and Space Science,Nanjing University,Nanjing 210023,China;Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University),Ministry of Education,Nanjing 210023,China
文献出处：
引用格式：
[1]Yuchen Xing;Keping Qiu-.Revisiting the Mass–Size Relation of Structures in Molecular Clouds)[J].天文和天体物理学研究,2022(07):118-127
A类：
Cygnus
B类：
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AB值：
0.45689
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