论文标题
在强烈禁止的星系NGC1300中巨型分子云的特性
Properties of giant molecular clouds in the strongly barred galaxy NGC1300
论文作者
论文摘要
恒星形成活动取决于银河尺度的环境。为了了解恒星形成活性的变化，必须比较具有不同星形形成效率（SFE）的巨型分子云（GMC）的性质。因此，我们专注于一个强烈禁止的银河系，以研究银河环境对GMCS特性的影响，因为在条形区域中SFE明显低于手臂区域。在本文中，我们将$^{12} $ co（$ 1-0 $）观察到对强限制的Galaxy NGC1300的西部酒吧，手臂和棒端区域，其ALMA 12-M阵列的高角度分辨率为$ \ sim $ 40 $ 40。我们检测到与黑暗车道相关的GMC，不仅在手臂和杆端区域，而且还在酒吧区域中，在那里没有看到大量恒星形成。使用CPROPS算法，我们在观察到的区域确定并表征了233个GMC。基于Kolmogorov-Smirnov检验，我们发现GMC特性（例如半径，速度分散剂，分子气体质量和病毒参数）几乎没有显着变化。这些结果表明，GMC的物理性质的系统差异并不是SFE与环境差异的原因，并且应该有其他机制控制GMC的SFE，例如NGC1300中的快速云碰撞。
Star formation activity depends on galactic-scale environments. To understand the variations in star formation activity, comparing the properties of giant molecular clouds (GMCs) among environments with different star formation efficiency (SFE) is necessary. We thus focus on a strongly barred galaxy to investigate the impact of the galactic environment on the GMCs properties, because the SFE is clearly lower in bar regions than in arm regions. In this paper, we present the $^{12}$CO($1-0$) observations toward the western bar, arm and bar-end regions of the strongly barred galaxy NGC1300 with ALMA 12-m array at a high angular resolution of $\sim$40 pc. We detected GMCs associated with the dark lanes not only in the arm and bar-end regions but also in the bar region, where massive star formation is not seen. Using the CPROPS algorithm, we identified and characterized 233 GMCs across the observed regions. Based on the Kolmogorov-Smirnov test, we find that there is virtually no significant variations in GMC properties (e.g., radius, velocity dispersion, molecular gas mass, and virial parameter) among the bar, arm and bar-end region. These results suggest that systematic differences in the physical properties of the GMCs are not the cause for SFE differences with environments, and that there should be other mechanisms which control the SFE of the GMCs such as fast cloud-cloud collisions in NGC1300.
