用吸积盘风解释NGC 5548中的宽线区结构
Accretion disk wind as explanation for the broad-line region structure in NGC 5548
摘要：
活动星系核中心的超大质量黑洞被宽线区所包围。在活动星系核光谱中看到的宽发射线就是在这个空间未分辨的区域发射的。我们打算获得的信息的结构和几何形状的基础上观察到的线轮廓的BLR。根据NGC 5548中可变宽谱线的线宽FWHM和谱线色散sigma_line，模拟了谱线发射区的旋转速度和湍流速度。根据这些速度，我们估计了线发射区域在中平面上方的高度，即它们与中心的距离。宽的发射线起源于距离中心2至27光日的距离。更高的电离线起源于内部区域（小于等于13光日），在中面上方1至14光日的特定的平行结构中。相比之下，H β谱线是在一个外部（6 - 26光日），更平坦的配置，仅在中平面上方0.7至4光日的高度发射的。在NGC 5548的线发射区的几何形状是一致的，从吸积盘发射的外流风。
英文摘要：
Supermassive black holes in the centers of active galactic nuclei (AGN) are surrounded by broad-line regions (BLRs). The broad emission lines seen in the AGN spectra are emitted in this spatially unresolved region. We intend to obtain information on the structure and geometry of this BLR based on observed line profiles. We modeled the rotational and turbulent velocities in the line-emitting region on the basis of the line-width FWHM and line dispersion sigma_line of the variable broad emission lines in NGC5548. Based on these velocities we estimated the height of the line-emitting regions above the midplane in the context of their distances from the center. The broad emission lines originate at distances of 2 to 27 light days from the center. Higher ionized lines originate in the inner region (lesser equal 13 light days) in specific filamentary structures 1 to 14 light days above the midplane. In contrast, the Hbeta line is emitted in an outer (6 - 26 light days), more flattened configuration at heights of 0.7 to 4 light days only above the midplane. The derived geometry of the line-emitting region in NGC5548 is consistent with an outflowing wind launched from an accretion disk.
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