Recent studies showed that observations of line emission from shocks in YSO jets require a substantial amount of ionization of the pre-shock matter. Photoionization from X-ray emitted close to the central source may be responsible for the initial ionization fraction. The aim of our work is to study the effect of X-ray photoionization, coming from the vicinity of the central star, on the ionization fraction inside the jet that can be advected at large distances. For this purpose we have performed axisymmetric MHD jet launching simulations including photoionization and optically thin losses using PLUTO. For typical X-ray luminosities in classical T-Tauri stars, we see that the photoionization is responsible for ionizing to 10%-20% the jet close to the star.

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Herbig-Haro 喷流中原星驱动光电离的模拟

最近的研究表明，对 YSO 喷流中激波线发射的观察需要大量的预激波物质电离。靠近中心源发射的 X 射线的光电离可能是初始电离分数的原因。我们工作的目的是研究来自中央恒星附近的 X 射线光电离对可以远距离平流的射流内部的电离分数的影响。为此，我们使用 PLUTO 进行了轴对称 MHD 射流发射模拟，包括光电离和光学薄损失。对于经典 T 金牛座恒星中典型的 X 射线光度，我们看到光电离负责将靠近恒星的射流电离到 10%-20%。