在耀变体中捕捉深度光学耀斑
Catching profound optical flares in blazars
摘要：
耀变体中的耀斑事件代表了在河外天体中观察到的最激烈的过程之一。对这类事件的研究揭示了耀变体最内部区域发生的物理过程的能量学，这些物理过程是任何现有仪器都无法解决的。在这项工作中，我们提出了一些最大和最快速的耀斑在光学波段捕获的耀变体3C 279，OJ 49，S4 0954+658，TXS 1156+295和PG 1553+113。据观察，在几周的时间尺度内，源通量增加了近十倍。我们应用了时间序列分析和对称性分析的几种方法。此外，我们还使用Lomb-Scargle方法对3C 279、OJ 49和PG 1553+113的光变曲线进行了周期性搜索，发现了准周期振荡（QPO）的合理迹象。特别是在3C 279中发现的33天和22天周期，即3：2的比例，是有趣的。这些剧烈的事件可能起源于喷流底部附近的磁流体动力学不稳定性，由吸积盘的磁场调制的过程触发。我们提出了一个定性的治疗所观察到的大幅度通量变化的可能的解释在源-内在和源-外在的情况。
英文摘要：
Flaring episodes in blazars represent one of the most violent processes observed in extra-galactic objects. Studies of such events shed light on the energetics of the physical processes occurring in the innermost regions of blazars, which cannot otherwise be resolved by any current instruments. In this work, we present some of the largest and most rapid flares captured in the optical band in the blazars 3C 279, OJ 49, S4 0954+658, TXS 1156+295 and PG 1553+113. The source flux was observed to increase by nearly ten times within a timescale of a few weeks. We applied several methods of time series analysis and symmetry analysis. Moreover, we also performed searches for periodicity in the light curves of 3C 279, OJ 49 and PG 1553+113 using the Lomb-Scargle method and found plausible indications of quasi-periodic oscillations (QPOs). In particular, the 33- and 22-day periods found in 3C 279, i.e. a 3:2 ratio, are intriguing. These violent events might originate from magnetohydrodynamical instabilities near the base of the jets, triggered by processes modulated by the magnetic field of the accretion disc. We present a qualitative treatment as the possible explanation for the observed large amplitude flux changes in both the source-intrinsic and source-extrinsic scenarios.
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