射电星系3C 390.3的可变光学连续谱和亚秒差距尺度喷流之间联系的观测证据
Observational evidence for the link between the variable optical continuum and the subparsec-scale jet of the radio galaxy 3C 390.3
摘要：
由于活动星系核区域的复杂性，人们对射电强活动星系核可变连续辐射产生的机制和区域还知之甚少。高分辨率射电VLBI（甚长基线干涉测量）观测允许放大到射电大声星系3C 390.3中喷流的亚秒差距尺度区域。我们结合了射电VLBI和光学数据，涵盖了14年的时间段，寻找光学耀斑和秒差距尺度喷流之间的联系。我们确定了两个固定的和九个移动的无线电功能在最里面的subparsec尺度区域的射流。所有九次喷射都与光学耀斑有关。我们发现了一个显着的相关性（在$>99.99%$的置信水平）之间的喷射组件和光学连续耀斑。运动节点经过静止射电特征位置和光学光变曲线达到最大值的历元是相关的。射电事件发生在光学耀斑极大值之后，平均时间延迟为$0.10\pm0.04$年。如果可变光学连续谱发射产生于射流的最内部，则可以理解这种相关性。能量释放的一个可能机制是高能电子结的喷射，这些电子在喷流中加速，并在从无线电到X射线波段的广泛频率范围内产生同步加速器连续辐射的耀斑。在这种情况下，从喷流和反喷流的光束光学连续辐射电离了围绕喷流的亚相对论流出中的气体，这导致形成两个具有宽发射线的流出锥形区域（除了围绕中心核的传统宽线区域之外）。
英文摘要：
The mechanism and the region of generation of variable continuum emission are poorly understood for radio-loud AGN because of a complexity of the nuclear region. High-resolution radio VLBI (very long baseline interferometry) observations allow zooming into a subparsec-scale region of the jet in the radio-loud galaxy 3C 390.3. We combined the radio VLBI and the optical data covering the time period of 14 years to look for a link between optical flares and parsec-scale jet. We identify two stationary and nine moving radio features in the innermost subparsec-scale region of the jet. All nine ejections are associated with optical flares. We found a significant correlation (at a confidence level of $>99.99%$) between the ejected jet components and optical continuum flares. The epochs at which the moving knots pass through the location of a stationary radio feature and the optical light curve reaches the maximum are correlated. The radio events follow the maxima of optical flares with the mean time delay of $0.10\pm0.04$ years. This correlation can be understood if the variable optical continuum emission is generated in the innermost part of the jet. A possible mechanism of the energy release is the ejection of knots of high-energy electrons that are accelerated in the jet flow and generate flares of synchrotron continuum emission in the wide range of frequencies from radio to X-ray bands. In this scenario, the beamed optical continuum emission from the jet and counterjet ionizes a gas in a subrelativistic outflow surrounding the jet, which results in a formation of two outflowing conical regions with broad emission lines (in addition to the conventional broad line region around the central nucleus).
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
