Giant molecular cloud catalogues for PHANGS-ALMA: methods and initial results

Giant molecular cloud catalogues for PHANGS-ALMA: methods and initial results
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PHANGS-ALMA 巨型分子云目录:方法和初步结果

DOI:
10.1093/mnras/stab085
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发表时间:
2021
影响因子:
4.8
通讯作者:
Pety, Jérôme
Pety, Jérôme
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Rosolowsky, Erik;Hughes, Annie;Leroy, Adam K;Sun, Jiayi;Querejeta, Miguel;Schruba, Andreas;Usero, Antonio;Herrera, Cinthya N;Liu, Daizhong;Pety, Jérôme

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我们提出了改进的方法分割CO排放从星系到个人的分子云,提供了一个更新的thepropsalms提出的Rosolowsky和Leroy。新的代码使噪声和数据之间的空间分辨率均匀化,从而允许进行严格的比较分析。该代码还通过虚假源注入对数据的完整性进行建模,并包括更新的分割方法,以更好地处理混合发射。这些改进的算法在一个公开可用的Python包pycprops中实现。我们将这些方法应用到10个最近的星系在PHANGS-ALMA调查,编目CO排放在一个共同的90 pc的分辨率和匹配的噪声水平。我们测量了4986个单独的云在这些目标中确定的属性。我们研究了每个星系中云的性质和质量分布之间的标度关系。云的物理性质在星系之间变化,既作为银河系中心半径的函数,也作为动力学环境的函数。总的来说,我们的目标星系的云是很好的描述近似能量均分,虽然在恒星酒吧和星系中心的云显示升高的线宽和维里参数。旋臂云的质量分布具有典型的质量尺度,比臂间云大2.5倍,旋臂云显示出比臂间云略低的中值维里参数(1.2比1.4)。
We present improved methods for segmenting CO emission from galaxies into individual molecular clouds, providing an update to thecpropsalgorithms presented by Rosolowsky & Leroy. The new code enables both homogenization of the noise and spatial resolution among data, which allows for rigorous comparative analysis. The code also models the completeness of the data via false source injection and includes an updated segmentation approach to better deal with blended emission. These improved algorithms are implemented in a publicly availablePythonpackage,pycprops. We apply these methods to 10 of the nearest galaxies in the PHANGS-ALMA survey, cataloguing CO emission at a common 90 pc resolution and a matched noise level. We measure the properties of 4986 individual clouds identified in these targets. We investigate the scaling relations among cloud properties and the cloud mass distributions in each galaxy. The physical properties of clouds vary among galaxies, both as a function of galactocentric radius and as a function of dynamical environment. Overall, the clouds in our target galaxies are well-described by approximate energy equipartition, although clouds in stellar bars and galaxy centres show elevated line widths and virial parameters. The mass distribution of clouds in spiral arms has a typical mass scale that is 2.5× larger than interarm clouds and spiral arms clouds show slightly lower median virial parameters compared to interarm clouds (1.2 versus 1.4).
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