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
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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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发表时间:
2020
影响因子:
4.9
通讯作者:
S. M. Fall
S. M. Fall
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
A. Mok;R. Chandar;S. M. Fall

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我们比较了六个星系中年轻星团(年龄≤ 10 Myr)和巨分子云(GMC)的质量函数,这些星系涵盖了大范围的质量、金属丰度和恒星形成率(LMC、M83、M51、NGC 3627、天线和NGC 3256)。我们对两个总体执行 Schechter 函数 的最大似然拟合。我们发现样本中的大多数 GMC 和簇质量函数都符合纯幂律分布 ( )。 M51 是唯一一个在两个星系群中都显示出上截止值 (M*) 的证据的星系。因此,GMC 和星团群体中的物理上质量截止可能是例外而不是规则。当我们执行幂律拟合时,我们发现 GMC 样本的指数 βPL = -2.3 ± 0.3 范围相对较小,簇样本的指数 βPL = -2.0 ± 0.3。这一结果与星团形成的理论预测一致,表明恒星形成效率在很大程度上与 GMC 的质量无关。
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.
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DOI: 10.1088/0004-637x/784/1/3
发表时间: 2014
期刊: The Astrophysical Journal
影响因子: --
作者:
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DOI: 10.1088/0004-637x/779/1/42
发表时间: 2013-04
期刊: The Astrophysical Journal
影响因子: --
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