用VLBI探测NRAO 150的γ射线辐射区及其与喷流抛射的关联
Probing the $γ$-ray emission region and the connection to jet ejections in NRAO 150 with VLBI
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中文总结 AI 辅助
本研究利用VLBI数据探究耀变体NRAO 150的γ射线辐射区与喷流抛射的关联，发现γ射线耀发与新喷流成分抛射紧密相关，内侧喷流存在环形磁场，明确了磁场的关键作用。
中文摘要 AI 辅助
活动星系核产生的相对论性喷流是理解超大质量黑洞吸积及其近邻环境物理的基础，但喷流的起源仍是未解之谜。NRAO 150是一个耀变体，其相对论性喷流形态复杂，因强投影效应会在短时间尺度上演化，适合进行详细的运动学分析。本研究利用甚长基线阵列（VLBA）和欧洲VLBI网络（EVN）2010年至2019年43 GHz的观测数据，探究NRAO 150喷流的形成与抛射过程。我们研究γ射线和射电光变曲线，结合总强度和线偏振信息，探究耀发事件、γ射线辐射与新喷流结构抛射的关联；还分析偏振光捕捉到的最内侧喷流区域的磁场结构，以获取γ射线耀发前、中、后的磁场配置信息。结果表明，γ射线耀发活动与新VLBI喷流成分的抛射存在紧密时间关联，说明高能辐射产生于VLBI核心的下游区域；运动学与偏振的联合证据进一步指向内侧喷流存在环形磁场，凸显了磁场在调控NRAO 150喷流动力学及高能辐射中的关键作用。
英文摘要
Relativistic jets launched by active galactic nuclei are fundamental for understanding the physics of accreting supermassive black holes and their immediate environments, yet the origin of these jets remains an open question. NRAO 150 is a blazar with a complex relativistic jet morphology that evolves on short timescales due to strong projection effects, enabling detailed kinematic analysis. In this study, we utilise data by the Very Long Baseline Array and the European VLBI Network from 2010 until 2019 at 43 GHz, to understand the formation and launching processes of the jet in NRAO 150. We study the $γ$-ray and radio light-curves, together with total intensity and linear polarisation information to probe the connection between flaring events, $γ$-ray emission, and the ejection of new jet features. Furthermore, we investigate the magnetic field configuration in the innermost jet region, as captured in polarised light, to gain insights about its configuration before, during, and after a $γ$-ray flare. Our results indicate a close temporal link between the $γ$-ray flaring activity and the ejection of new VLBI jet components, suggesting that the high-energy emission is produced downstream of the VLBI core. The combined kinematic and polarimetric evidence further points to a toroidal magnetic field in the inner jet, highlighting the key role of magnetic fields in governing both jet dynamics and high-energy emission in NRAO 150.
