有源半导体中锁相吸收系统的精细调谐及其物理根源
On The Fine Tuning and Physical Origin of Line-Locked Absorption Systems in Active Galaxies
摘要：
吸收线系统的线锁定（LL）是辐射压力在驱动天体物理流动中的动力学重要性的明确标志，最近的研究结果表明，它可能在表现出多个本征窄吸收线（NAL）系统的类星体中很常见。在这项工作中，我们探测的相空间有利于LL，并遵循详细的运动学的那些系统，可能锁定在速度分离的CIV $λλ1548.19,1550.77$双峰。我们发现，一个小体积的相位相位承认LL，这表明锁定系统的物理性质之间的高度微调。LL对类星体光度变化的稳定性量化的影响，类星体的长期变化幅度和多个NAL系统之间的速度分离统计。CIV双峰LL的高发生率意味着类星体隐藏的极端紫外辐射不太可能被当前的模型显著低估。此外，LL速度与流出速度的比率可以用作对加速介质的组成的强有力的约束。我们的结论是LL构成了重大挑战，目前的理论形成的非干预NAL系统，并推测它可能是一个表现形式的扩张拱壳周围的渐近巨星分支（AGB）恒星在类星体的主机凸起。
英文摘要：
Line locking (LL) of absorption line systems is a clear signature of the dynamical importance of radiation pressure force in driving astrophysical flows, with recent findings suggesting that it may be common in quasars exhibiting multiple intrinsic narrow absorption-line (NAL) systems. In this work we probe the phase space conducive to LL and follow the detailed kinematics of those systems that may lock at the velocity separation of the CIV $λλ1548.19,1550.77$ doublet. We find that a small volume of the phase-phase admits LL, suggesting a high-degree of fine-tuning between the physical properties of locked systems. The stability of LL against quasar luminosity variations is quantified with implications for the long-term variability amplitude of quasars and the velocity-separation statistic between multiple NAL systems. The high occurrence of LL by the CIV doublet implies that the hidden extreme-UV emission from quasars is unlikely to be significantly under-estimated by current models. Further, the ratio of the LL velocity to the outflow velocity may serve as a powerful constraint on the composition of the accelerating medium. We conclude that LL poses significant challenges to current theories for the formation of non-intervening NAL systems, and speculate that it may be a manifestation of expanding circumstellar shells around asymptotic giant branch (AGB) stars in the quasar-host bulge.
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