银河系中H ii区域的年龄、大小和位置。湍流分子云中电离气体的膨胀
Age, size, and position of H ii regions in the Galaxy. Expansion of ionized gas in turbulent molecular clouds
摘要：
这项工作的目的是提高目前的理解H II区域和湍流分子云之间的相互作用。我们提出了一种新的方法来确定年龄的一个大样本的OB协会通过调查其相关的H II区域在周围的湍流介质中的发展。使用解析解，一维（1D），和三维（3D）的模拟，我们约束的电离气泡的膨胀取决于母分子云的湍流水平。然后计算1D模拟的网格，以在压力-尺寸图中建立H ii区域的等时曲线。这种网格模型允许大样本的OB协会，并用于H II地区发现调查（HRDS）。解析解和数值模拟表明，H II区域的膨胀减慢的湍流的电离气体的压力是在一个准平衡与湍流冲压压力的点。基于这一结果，我们建立了一个网格的H II区域的扩展在一个配置文件的基础上拉森定律的一维模型。通过有效的1D温度分布来考虑3D湍流。由该网格的等时线估计的年龄与Rosette、RCW 36、RCW 79和M16等著名地区的文献值吻合得很好。因此，我们建议，这种方法可以用来给年龄的年轻OB协会通过银河系，如HRDS调查，也在附近的河外来源。
英文摘要：
This work aims at improving the current understanding of the interaction between H ii regions and turbulent molecular clouds. We propose a new method to determine the age of a large sample of OB associations by investigating the development of their associated H ii regions in the surrounding turbulent medium. Using analytical solutions, one-dimensional (1D), and three-dimensional (3D) simulations, we constrained the expansion of the ionized bubble depending on the turbulent level of the parent molecular cloud. A grid of 1D simulations was then computed in order to build isochrone curves for H ii regions in a pressure-size diagram. This grid of models allowed to date large sample of OB associations and was used on the H ii Region Discovery Survey (HRDS). Analytical solutions and numerical simulations showed that the expansion of H ii regions is slowed down by the turbulence up to the point where the pressure of the ionized gas is in a quasi-equilibrium with the turbulent ram pressure. Based on this result, we built a grid of 1D models of the expansion of H ii regions in a profile based on Larson laws. The 3D turbulence is taken into account by an effective 1D temperature profile. The ages estimated by the isochrones of this grid agree well with literature values of well-known regions such as Rosette, RCW 36, RCW 79, and M16. We thus propose that this method can be used to give ages of young OB associations through the Galaxy such as the HRDS survey and also in nearby extra-galactic sources.
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