论文标题
OVI在$ z \ sim 1 $大型星系的宇宙学模拟中带有碰撞电离边界的光电离
OVI Traces Photoionized Streams With Collisionally Ionized Boundaries in Cosmological Simulations of $z \sim 1$ Massive Galaxies
论文作者
论文摘要
我们分析了OVI在$ \ sim 10^{12} $ \ odot $ at $ z \ sim1 $的$ \ sim 10^{12} $ \ sim \ odot $ ov a s \ sim1 $ ov sim \ odot $ ovi ovi ovi halo的分布和起源。我们发现流动冷水中的OVI主要是光电离的，而在大容量中，它主要是碰撞电离的。光电离的组件在大冲击参数下（$ \ gtrsim 0.3 r _ {\ rm vir} $）主导了观察到的柱密度，而碰撞电离的组件则更接近。我们发现，大多数碰撞OVI，质量，质量，质量属于相对较薄的光学溪流的边界。我们讨论结果如何与流和边界特性的分析预测及其与观测值的兼容性一致。这使我们能够预测未来CGM观察中OVI和其他离子的概况，并提供了一种用于解释它们的玩具模型。
We analyse the distribution and origin of OVI in the Circumgalactic Medium (CGM) of dark-matter haloes of $\sim 10^{12}$ M$_\odot$ at $z\sim1$ in the VELA cosmological zoom-in simulations. We find that the OVI in the inflowing cold streams is primarily photoionized, while in the bulk volume it is primarily collisionally ionized. The photoionized component dominates the observed column density at large impact parameters ($\gtrsim 0.3 R_{\rm vir}$), while the collisionally ionized component dominates closer in. We find that most of the collisional OVI, by mass, resides in the relatively thin boundaries of the photoionized streams. We discuss how the results are in agreement with analytic predictions of stream and boundary properties, and their compatibility with observations. This allows us to predict the profiles of OVI and other ions in future CGM observations and provides a toy model for interpreting them.
