NGC 5548的混响映射数据暗示一个多成分宽线区
Reverberation Mapping Data of NGC 5548 Imply a Multicomponent Broad-Line Region
AI总结：
NGC 5548的混响映射数据显示宽线轮廓单峰与延迟轮廓双峰的矛盾，简单云团或薄盘模型无法解释，表明宽线区具有多成分结构，并提出多种可能解决方案。
摘要：
谱线展宽和变化是活动星系核的观测标志，使我们能够测量超大质量黑洞质量并限制发射气体的几何结构和运动学，其中最精确的测量需要一定程度的建模。宽线区的两种流行模型将发射气体描述为膨胀云团分布或具有强速度梯度的薄盘。正如我们在本工作中所展示的，AGN STORM团队在NGC 5548中获得的混响映射数据集中的关键特征无法被任一简单模型解释。在几条发射线中，观测到的宽线轮廓具有单峰，而延迟轮廓具有明显的双峰，这强烈促使我们考虑具有多成分发射的BLR。我们展示了几种可能缓解这种矛盾并更好地代表NGC 5548及其他星系中宽线发射气体真实性质的可能性。
英文摘要：
Line broadening and variability are observational hallmarks of active galactic nuclei which allow us to measure supermassive black hole masses as well as constrain the geometry and kinematics of the emitting gas, with the most precise measurements requiring a degree of modeling. Two popular models of the broad-line region describe the emitting gas as either a distribution of puffed up clouds or a thin disk with strong velocity gradients. As we show in this work, key features in the reverberation mapping dataset obtained by the AGN STORM team in NGC 5548 cannot be accounted for by either simple model. In several emission lines the observed broad-line profile has a single peak yet the delay profile has a distinct double peak, strongly motivating a BLR with emission from multiple components. We demonstrate a few possibilities that may alleviate the tension and better represent the true nature of the broad-line emitting gas in NGC 5548 and beyond.
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