标题： III Zw 2中的发射线区：动力学与变化性 显示英文标题

标题： The Line Emission Region in III Zw 2: Kinematics and Variability

摘要： 我们研究了 Seyfert 1 星系 III Zw 2 的 Ly-α、Hβ、Hα 和 Mg II 2798 谱线轮廓。 这些宽发射线的形状显示出多组分起源的证据，同时也可能识别出由旋转盘引起的峰值。 我们提出了一种由内层开普勒相对论盘和环绕该盘的外层结构组成的两组分宽线区（BLR）模型。 拟合这四个宽发射线（BELs）的结果，在内层和外层组分参数上高度一致。 采用中心天体质量约为 2 × 10⁸ 太阳质量的假设，我们发现对于所考虑的四条谱线，盘的外半径大致相同（约 0.01 pc）。 然而，盘的内半径并不相同：Ly-α 为 0.0018 pc，Mg II 为 0.0027 pc，而 Hα 和 Hβ 的为 0.0038 pc。 这以及窄 [OIII] 线蓝翼中相对较宽的成分表明发射线区域存在分层现象。 利用长期 Hβ 观测数据（1972-1990 年，1998 年），我们发现相对于 [OIII] 线，BEL 的流量发生了变化。 显示英文摘要

摘要： We have studied the Ly-al, Hbeta, Halpha and Mg II2798 line profiles of the Seyfert 1 galaxy III Zw 2. The shapes of these broad emission lines show evidence of a multicomponent origin and also features which may be identified as the peaks due to a rotating disk. We have proposed a two-component Broad Line Region (BLR) model consisting of an inner Keplerian relativistic disk and an outer structure surrounding the disk. The results of the fitting of the four Broad Emission Lines (BELs) here considered, are highly consistent in both the inner and outer component parameters. Adopting a mass of approx. 2 E8 sollar masses for the central object we found that the outer radius of the disk is approximately equal for the four considered lines (approx 0.01 pc). However, the inner radius of the disk is not the same: 0.0018 pc for Ly-alpha, 0.0027 pc for Mg II, and 0.0038 pc for the Balmer lines. This as well as the relatively broad component present in the blue wings of the narrow [OIII] lines indicate stratification in the emission-line region. Using long-term Hbeta observations (1972-1990, 1998) we found a flux variation of the BEL with respect to the [OIII] lines.