标题： NGC 5548中的宽发射线区动力学：磁流体力学风模型与观测结果 显示英文标题

标题： Dynamics of Broad-Emission Line Region in NGC 5548: Hydromagnetic Wind Model versus Observations

摘要： 我们分析了塞佛特1型星系NGC 5548中宽线区（BLR）的长期观测结果，并与Emmering、Blandford和Shlosman提出的磁流体力学驱动外流模型的预测进行了关键比较。 该模型用于生成响应连续变化的CIV谱线的时间序列。模型包括云团发射各向异性、云团遮挡、由CLOUDY生成的发射率函数以及窄线组分，以生成线形，并基于NGC 5548监测活动的连续输入驱动。 线强度、线形和延迟时间与观测结果进行了对比。该模型无需调整参数即可重现此AGN中CIV线变异性的一些基本特征。最佳拟合模型提供了CIV BLR的有效大小、主导几何结构、发射率分布及三维速度场，并限制了中心黑洞的质量。 风的内层似乎负责非各向同性发射的CIV线，而其外层仍然尘埃密布且分子化，因此具有与分子环类似的光谱特性，尽管其动力学本质不同。 此外，我们的模型预测了CIV线形跨线的差异响应，在中翼部分先出现红侧响应，随后是蓝中翼和线核响应。 根据数据与模型互相关函数以及一维和二维传递函数的比较，我们发现旋转外流模型与NGC 5548中BLR的观测结果兼容。 显示英文摘要

摘要： We analyze the results of long-term observations of broad-line region (BLR) in the Sy1 galaxy NGC 5548 and provide a critical comparison with the predictions of a hydromagnetically-driven outflow model of Emmering, Blandford and Shlosman. This model was used to generate a time series of CIV line profiles that have responded to a time varying continuum. The model includes cloud emission anisotropy, cloud obscuration, a CLOUDY-generated emissivity function and a narrow-line component used to generate the line profiles, and is driven with continuum input based on the monitoring campaigns of NGC 5548. The line strengths, profiles and lags are compared with the observations. It reproduces the basic features of CIV line variability in this AGN without varying the model parameters. The best fit model provides the effective size, the dominant geometry, the emissivity distribution and the 3D velocity field of the CIV BLR and constrains the mass of the central BH. The inner part of the wind appears to be responsible for the anisotropically emitted CIV line, while its outer part remains dusty and molecular, thus having similar spectral characteristics to a molecular torus, although its dynamics is fundamentally different. In addition, our model predicts a differential response across the CIV line profile, producing a red-side-first response in the mid-wings followed by the blue mid-wing and by the line core. Based on the comparison of data and model cross-correlation functions and 1D and 2D transfer functions, we find that the rotating outflow model is compatible with observations of the BLR in NGC 5548.