AI 中文总结
研究利用吸收线变率方法结合多光谱数据估算 NGC 5548 中紫外外流成分径向距离，通过分析吸收线变率探测率曲线测量复合时标，确定各成分位置，结果与文献相符，展现新方法有效性。
AI 中文摘要
AGN 驱动的外流常被视为超大质量黑洞调节星系演化的关键因素。中心引擎的径向距离是评估这些外流对宿主星系影响的关键参数。本文利用最新的吸收线变率方法，结合 2014 年 AGN STORM 活动的多历元 HST/COS 光谱及 2013 年的存档数据，估算 NGC 5548 中紫外外流成分的径向距离。通过分析吸收线变率的探测率曲线测量吸收体的复合时标（tr）。特别是显示混合多速度成分的吸收谷探测率曲线具有独特的“多步”轮廓，可测量单个成分的 tr。在 6 个已识别的外流成分中，4 个距中心几 pc，2 个距中心 30 - 40 pc。结果与文献中关于成分 1 和 4 的更可靠结果相符，与先前工作总体一致，证明了新方法的有效性，尤其是在密集采样的 HST 光谱辅助下。
英文摘要
AGN-driven outflows are routinely invoked as a key agent of supermassive black holes to regulate the evolution of galaxies. The radial distance from the central engine is a crucial parameter for evaluating the impact of these outflows on the host galaxy. In this work, we estimate the radial distances of ultraviolet (UV) outflow components in NGC 5548 using the most up-to-date absorption-line variability method, combined with multi-epoch HST/COS spectroscopy from the 2014 AGN STORM campaign and archival data observed in 2013. The recombination timescale (tr) of the absorbers are measured by analyzing the detection rate curves of absorption-line variability. In particular, the detection rate curves of the absorption troughs showing blended multiple velocity components are featured by distinct ``multi-step' profiles, allowing for measuring tr for individual components. Among the 6 identified outflow components, four are found to be a few pc from the center and two are 30-40 pc away. Our results agree well with the more reliable results in the literature on components 1 and 4, and show overall consistency with previous works, demonstrating the power of our new methodology especially when it is aided by densely sampled HST spectra.
Journal refYaqi Chen et al 2026 ApJ 997 245
