类星体中气体外流的电离驱动碎裂导致FeLoBALs
Ionization Driven Fragmentation of Gas Outflows Responsible for FeLoBALs in Quasars
摘要：
我们表明，在紫外电离连续的类星体的时间变化，在$\sim$ 1年的尺度上，影响负责低电离宽吸收线的等离子体的动态结构。电离连续的变化产生非平衡光电离条件的吸收云和超音速移动电离锋的一个显着的部分。当通量下降时，电离区的收缩驱动超声速冷却锋朝向辐射源，并驱动稀疏波朝向相反方向。压力不平衡通过冷气体相对于前部的增加的速度来补偿。当通量恢复时，冷气体被远离辐射源的超声速电离前沿再电离和再加热，并产生前向激波。再加热云平衡到$\sim 10^4$ K的温度，并观察到具有不同的径向速度比主云。这种碎裂似乎与在某些物体中看到的多组分槽结构相一致。如果云内存在强磁场（$\sim$ 10 mG），我们的模型可以再现类星体QSO 2359- 1241和SDSS J 0318 - 0600中各分量之间的速度差。
英文摘要：
We show that time variations in the UV ionizing continuum of quasars, on scales of $\sim$1 year, affect the dynamic structure of the plasmas responsible for low ionization broad absorption lines. Variations of the ionizing continuum produce non-equilibrium photoionization conditions over a significant fraction of the absorbing clouds and supersonically moving ionization fronts. When the flux drops the contraction of the ionized region drives a supersonic cooling front towards the radiation source and a rarefaction wave in the opposite direction. The pressure imbalance is compensated by an increased speed of the cool gas relative to the front. When the flux recovers the cool gas is re-ionized and re-heated by a supersonic ionization front traveling away from the radiation source and a forward shock is created. The reheated clouds equilibrate to a temperature of $\sim 10^4$ K and are observed to have different radial velocities than the main cloud. Such fragmentation seems consistent with the multicomponent structure of troughs seen in some objects. The velocity differences measured among various components in the quasars QSO 2359--1241 and SDSS J0318--0600 can be reproduced by our model if strong magnetic fields ($\sim$10 mG) are present within the clouds.
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