We analyze the spectra of $10$ Green Pea galaxies, previously studied by Henry et al. (2015), using a semi-analytical line transfer (SALT) model to interpret emission and absorption features observed in UV galactic spectra. We focus our analysis on various ionization states of silicon, associated with the cool ($\sim 10^4$ K) and warm ($\sim 10^5$ K) gas. By analyzing low-ionization lines, we study the relationships between the distribution and kinematics of the outflowing H I gas and the observed Ly$\alpha$ escape fraction, $f_{esc}^{Ly\alpha}$, as well as the Ly$\alpha$ emission peak separation, $\Delta_{peak}$. We find that outflow geometries which leave a portion of the source uncovered along the line of sight create the best conditions for Ly$\alpha$ escape and have narrow peak separations, while geometries which block the observer's view of the source create the worst conditions for Ly$\alpha$ escape and have large peak separations. To isolate the effects of outflow kinematics, we restricted our testing set to galaxies with spherical outflows and found that $f_{esc}^{Ly\alpha}$ and the Ly$\alpha$ luminosity both increase with the extent of the galactic winds. A simple estimate suggests that the collisional excitation of neutral hydrogen by free electrons in the cool gas of the winds can account for the Ly$\alpha$ luminosity observed in these objects. Finally, we speculate on the relationship between outflows and the escape of ionizing radiation from the CGM.

中文翻译：

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双锥外流对青豆Lyα逃逸的影响

我们分析了 Henry 等人先前研究过的 $10$Green Pea 星系的光谱。(2015)，使用半解析线传递 (SALT) 模型来解释在紫外星系光谱中观察到的发射和吸收特征。我们将分析重点放在与冷 ($\sim 10^4$ K) 和暖 ($\sim 10^5$ K) 气体相关的硅的各种电离态上。通过分析低电离线，我们研究了流出的 HI 气体的分布和运动学与观测到的 Ly$\alpha$ 逃逸分数 $f_{esc}^{Ly\alpha}$ 以及 Ly $\alpha$ 发射峰分离，$\Delta_{peak}$。我们发现，沿视线留下一部分源未覆盖的流出几何形状为 Ly$\alpha$ 逃逸创造了最佳条件，并具有狭窄的峰间距，而几何形状会阻挡观察者 s 的源视图为 Ly$\alpha$ 逃逸创造了最坏的条件，并且具有大的峰分离。为了隔离外流运动学的影响，我们将测试集限制在具有球形外流的星系，发现 $f_{esc}^{Ly\alpha}$ 和 Ly$\alpha$ 光度都随着银河风的范围而增加. 一个简单的估计表明，风的冷气体中的自由电子对中性氢的碰撞激发可以解释在这些物体中观察到的 Ly$\alpha$ 光度。最后，我们推测外流与电离辐射从 CGM 逃逸之间的关系。我们将测试集限制在具有球形外流的星系，发现 $f_{esc}^{Ly\alpha}$ 和 Ly$\alpha$ 光度都随着银河风的范围而增加。一个简单的估计表明，风的冷气体中的自由电子对中性氢的碰撞激发可以解释在这些物体中观察到的 Ly$\alpha$ 光度。最后，我们推测外流与电离辐射从 CGM 逃逸之间的关系。我们将测试集限制在具有球形外流的星系，发现 $f_{esc}^{Ly\alpha}$ 和 Ly$\alpha$ 光度都随着银河风的范围而增加。一个简单的估计表明，风的冷气体中的自由电子对中性氢的碰撞激发可以解释在这些物体中观察到的 Ly$\alpha$ 光度。最后，我们推测外流与电离辐射从 CGM 逃逸之间的关系。