Mass Functions of Giant Molecular Clouds and Young Star Clusters in Six Nearby Galaxies
Mass Functions of Giant Molecular Clouds and Young Star Clusters in Six Nearby Galaxies
复制标题
邻近六个星系中巨分子云和年轻星团的质量函数
DOI:
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复制
发表时间:
2020
影响因子:
4.9
通讯作者:
S. M. Fall
中科院分区:
文献类型:
--
作者:
A. Mok;R. Chandar;S. M. Fall
We compare the mass functions of young star clusters (ages ≤ 10 Myr) and giant molecular clouds (GMCs) in six galaxies that cover a large range in mass, metallicity, and star formation rate (LMC, M83, M51, NGC 3627, the Antennae, and NGC 3256). We perform maximum-likelihood fits of the Schechter function, , to both populations. We find that most of the GMC and cluster mass functions in our sample are consistent with a pure power-law distribution ( ). M51 is the only galaxy that shows some evidence for an upper cutoff (M*) in both populations. Therefore, physical upper mass cutoffs in populations of both GMCs and clusters may be the exception rather than the rule. When we perform power-law fits, we find a relatively small range of indices βPL = −2.3 ± 0.3 for our GMC sample and βPL = −2.0 ± 0.3 for the cluster sample. This result, that , is consistent with theoretical predictions for cluster formation and suggests that the star formation efficiency is largely independent of mass in the GMCs.
DOI:
10.3847/1538-4357/aabe27
发表时间:
2018
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Kim, Jeong-Gyu;Kim, Woong-Tae;Ostriker, Eve C.
通讯作者:
Ostriker, Eve C.
DOI:
10.1088/0004-637x/784/1/3
发表时间:
2014
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Colombo;Hughes;Schinnerer
通讯作者:
Schinnerer
DOI:
10.1088/0004-637x/779/1/42
发表时间:
2013-04
期刊:
The Astrophysical Journal
影响因子:
--
作者:
E. Schinnerer;S. Meidt;J. Pety;A. Hughes;D. Colombo;S. García-Burillo;K. Schuster;G. Dumas;C. Dobbs;A. Leroy;C. Kramer;T. Thompson;M. Regan
通讯作者:
E. Schinnerer;S. Meidt;J. Pety;A. Hughes;D. Colombo;S. García-Burillo;K. Schuster;G. Dumas;C. Dobbs;A. Leroy;C. Kramer;T. Thompson;M. Regan