THE PdBI ARCSECOND WHIRLPOOL SURVEY (PAWS): ENVIRONMENTAL DEPENDENCE OF GIANT MOLECULAR CLOUD PROPERTIES IN M51

THE PdBI ARCSECOND WHIRLPOOL SURVEY (PAWS): ENVIRONMENTAL DEPENDENCE OF GIANT MOLECULAR CLOUD PROPERTIES IN M51
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PdBI 弧秒漩涡调查 (PAWS):M51 中巨分子云特性的环境依赖性

DOI:
10.1088/0004-637x/784/1/3
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发表时间:
2014
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Schinnerer
Schinnerer
中科院分区:
--
文献类型:
--
作者:
Colombo;Hughes;Schinnerer

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利用来自 PdBI 弧秒漩涡巡天 (PAWS) 的数据,我们生成了迄今为止最大的河外巨分子云 (GMC) 目录,其中包含 1507 个单独的天体。内部 M51 盘中的 GMC 仅占调查总 12 CO (1-0) 光度的 54%,但平均而言,它们表现出与银河系 GMC 相似的物理特性。我们没有发现 GMC 大小和速度色散之间存在很强的相关性,简单的维里分析表明,M51 中约 30% 的 GMC 是未结合的。我们分析了七个动态驱动的星系环境中的 GMC 特性,发现旋臂和中心区域的 GMC 比臂间云更亮,并且具有更高的速度色散。在全球范围内,GMC 质量分布并不遵循简单的幂律形状。相反,我们发现质量分布的形状随星系环境的变化而变化:臂间区域的分布比旋臂中的分布更陡,并且在核棒区域的高质量处表现出急剧的截断。我们提出,观测到的 GMC 特性和质量分布的环境变化是大规模动力学过程和大质量恒星形成反馈共同作用的结果。我们描述了使用现有的 GMC 识别技术在分子丰富的环境(例如 M51 的内盘)中分解 12 CO (1–0) 排放的一些挑战。
Using data from the PdBI Arcsecond Whirlpool Survey (PAWS), we have generated the largest extragalactic giant molecular cloud (GMC) catalog to date, containing 1507 individual objects. GMCs in the inner M51 disk account for only 54% of the total 12 CO (1–0) luminosity of the survey, but on average they exhibit physical properties similar to Galactic GMCs. We do not find a strong correlation between the GMC size and velocity dispersion, and a simple virial analysis suggests that∼ 30% of GMCs in M51 are unbound. We have analyzed the GMC properties within seven dynamically motivated galactic environments, finding that GMCs in the spiral arms and in the central region are brighter and have higher velocity dispersions than inter-arm clouds. Globally, the GMC mass distribution does not follow a simple power-law shape. Instead, we find that the shape of the mass distribution varies with galactic environment: the distribution is steeper in inter-arm region than in the spiral arms, and exhibits a sharp truncation at high masses for the nuclear bar region. We propose that the observed environmental variations in the GMC properties and mass distributions are a consequence of the combined action of large-scale dynamical processes and feedback from high-mass star formation. We describe some challenges of using existing GMC identification techniques for decomposing the 12 CO (1–0) emission in molecule-rich environments, such as M51's inner disk.
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