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
中科院分区:
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
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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DOI:
10.3847/1538-4357/ab3a43
发表时间:
2019-08
期刊:
The Astrophysical Journal
影响因子:
--
作者:
A. Schruba;J. Kruijssen;A. Leroy
通讯作者:
A. Schruba;J. Kruijssen;A. Leroy
DOI:
10.1086/183042
发表时间:
1979
期刊:
The Astrophysical Journal
影响因子:
--
作者:
P. Solomon;D. B. Sanders;N. Scoville
通讯作者:
N. Scoville
DOI:
10.1088/0004-637x/776/1/23
发表时间:
2013
期刊:
The Astrophysical Journal
影响因子:
--
作者:
S. Benincasa;E. Tasker;R. Pudritz;J. Wadsley
通讯作者:
J. Wadsley
影响因子:
6.5
作者:
J. Braine;P. Gratier;Y. Contreras;K. Schuster;N. Brouillet
通讯作者:
N. Brouillet
影响因子:
6.5
作者:
H. Beuther;S. Meidt;E. Schinnerer;R. Paladino;A. Leroy
通讯作者:
A. Leroy