Kinematics of the Broad Emission Line Region in NGC 5548
Kinematics of the Broad Emission Line Region in NGC 5548
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NGC 5548 宽发射线区域的运动学
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Krolik
中科院分区：
文献类型：
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作者：
C. Done;J. Krolik
我们从1993年NGC5548监测活动中获得的数据导出了CIV 1549发射线的总通量和速度分辨响应函数。这些响应函数意味着：1.)发射区从内部1lt-d延伸到外部10lt-d，可能更好地描述为圆形而不是平坦；速度场主要由红/蓝对称分量(如二维或三维随机运动，或圆盘中的旋转)主导，但也存在径向跌落。定量模拟表明，随机速度通常是径向速度的几倍。然而，没有一个简单的模型给出一个完全可以接受的数据拟合。这些推论排除了许多简单而可信的宽线区域动力学模型，包括外流风、径向自由落体、圆盘自转或无碰撞轨道运动。
We derive both total flux and velocity-resolved response functions for the CIV 1549 emission line from the data obtained in the 1993 NGC 5548 monitoring campaign. These response functions imply: 1.) the emission region stretches from inside 1 lt-d to outside 10 lt-d, and is probably better described as round than flat; 2.) the velocity field is dominated by a red/blue symmetric component (e.g. 2--d or 3--d random motions, or rotation in a disk) but there is also {it significant} radial infall. Quantitative modelling indicates that the random speeds are typically a few times as large as the radial speed. However, no simple model gives a completely acceptable fit to the data. These inferences rule out numerous simple and otherwise plausible models for broad line region dynamics, including outflowing winds, radial free-fall, rotation in a disk, or collisionless orbital motion.