耀变体S5 0716+714中多波段事件的螺旋轨迹解释
A Helical Trajectory Interpretation of a Multi-wavelength Event in a Blazar S5 0716+714
浏览论文内容
中文总结 AI 辅助
本研究通过螺旋轨迹模型拟合S5 0716+714的γ射线光变与VLBA观测,揭示递增周期振荡源于移动喷流分量的几何多普勒调制,为连接耀变体光变与喷流演化提供框架。
中文摘要 AI 辅助
耀变体中的相对论性喷流在多个时标上表现出强烈的光变,但时间光变与喷流结构演化之间的联系仍知之甚少。在本工作中,我们研究了BL Lac天体S5 0716+714在2014年7月至2015年6月期间的γ射线光变,并探讨其与秒差距尺度喷流演化的可能联系。我们在γ射线光变曲线中识别出一种递增周期振荡(EPO),其特征是一系列连续的流量增强事件,且这些事件之间的时间间隔逐渐增大。将费米-大视场望远镜(Fermi-LAT)数据与同时期的43 GHz甚长基线阵列(VLBA)观测相结合,我们发现该EPO与一个超光速子源的向下游传播之间存在时间关联。一个螺旋轨迹模型同时拟合γ射线光变和二维VLBA分量位置,成功再现了观测到的流量调制和分量运动。这些结果表明,由移动喷流分量的观测视角变化引起的几何多普勒调制,为观测到的EPO提供了一种可能的解释。本工作为将耀变体光变与相对论性喷流的子源演化联系起来提供了一个框架。
英文摘要
Relativistic jets in blazars exhibit strong variability across multiple timescales, but the connection between temporal variability and the evolution of jet structures remains poorly understood. In this work, we investigate the $γ$-ray variability of the BL Lac object S5 0716+714 from July 2014 to June 2015 and explore its possible connection with the parsec-scale jet evolution. We identify an escalating periodic oscillation (EPO) in the $γ$-ray light curve, characterized by a sequence of successive flux enhancements with progressively increasing temporal separations. Combining \textit{Fermi}-LAT data with contemporaneous 43 GHz Very Long Baseline Array (VLBA) observations, we find a temporal association between the EPO and the downstream propagation of a superluminal knot. A helical trajectory model simultaneously fitting the $γ$-ray variability and the two-dimensional VLBA component positions reproduces the observed flux modulation and component motion. These results suggest that geometric Doppler modulation caused by the changing viewing angle of a moving jet component provides a possible explanation for the observed EPO. This work provides a framework of connecting blazar variability to the knot evolution of relativistic jets.
发表机构
- Shanghai Normal University(上海师范大学)
- Guangzhou University(广州大学)
- Chinese Academy of Sciences(中国科学院)
- University of Rijeka(里耶卡大学)
机构由 AI 辅助整理,请以论文原文为准。