射电星系中的同步辐射细丝：基于LOFAR与ROSAT观测的稀有性、稳定性及环境影响
Synchrotron filaments in radio galaxies: rarity, stability, and environmental influences from LOFAR and ROSAT observations
AI总结：
结合LoTSS与ROSAT数据，研究射电星系中稀有同步辐射细丝的特性，发现其最小压强低于环境热压强，揭示外部约束对其稳定性的作用，凸显其作为星系团磁场与AGN反馈探针的价值。
AI中文摘要：
我们结合LOFAR双米巡天（LoTSS）的144 MHz深度观测数据与存档ROSAT X射线数据，对射电星系中的丝状同步辐射结构开展系统研究。这些连接射电瓣且常与喷流轴对齐的窄而准直的特征较为稀有：我们对548个星系团关联源的目视检查共识别出12个候选体（约占2.2%），其中3个拥有清晰可分辨的细丝，适合开展详细的X射线与同步辐射最小压强分析。这些细丝的最小压强始终低于从X射线测量得到的环境热压强。这种差异表明外部约束对细丝稳定性起作用，符合热压强支撑及可能的环形磁场构型的理论预测。我们讨论了细丝形成的可能场景，包括活动星系核（AGN）的遗迹外流、磁场裹覆及等离子体不稳定性。我们的研究结果凸显了丝状结构作为星系团内磁场拓扑与AGN反馈探针的效用，并证明需开展高分辨率多频研究以约束其起源与演化。
英文摘要：
We present a systematic investigation of filamentary synchrotron structures in radio galaxies, using deep 144 MHz observations from the LOFAR Two-Metre Sky Survey (LoTSS) in combination with archival ROSAT X-ray data. These narrow, collimated features, linking radio lobes and often aligned with jet axes, are rare: our visual inspection of 548 cluster-associated sources identified 12 candidates (~2.2%), of which three exhibit clearly resolved filaments suitable for detailed X-ray and synchrotron minimum pressure analysis. Minimum pressures in these filaments are consistently lower than the ambient thermal pressure derived from X-ray measurements. This disparity implies a role for external confinement in filament stability, aligning with theoretical predictions of thermal pressure support and potentially toroidal magnetic field configurations. We discuss filament formation scenarios, including relic AGN outflows, magnetic draping, and plasma instabilities. Our findings highlight the utility of filamentary structures as probes of intracluster magnetic field topology and AGN feedback, and demonstrate the need for high-resolution, multi-frequency studies to constrain their origin and evolution.
