We study optical spectra in high and low activity states of the faint, distant Seyfert 1 galaxy C16.16. A strong stellar population contribution to the continuum is observed, even in the high-state spectrum. The low- ionization emission lines show large equivalent widths. Narrow-line ratios are used to parameterize and investigate the physical conditions in the narrow-line region. Photoionization models with nitrogen depletion, ionization continuum typical of an active galactic nucleus (AGN), and an ionization parameter U = 10^-2.8^ reproduce the observed narrow lines. The AGN continuum shows a strong variation, while the Balmer lines vary moderately. The Balmer lines have a broad and asymmetric component with double-peaked structure. Using the profiles of emission lines originated in a relativistic circular disk, we successfully fit the observed broad Hα profile. This disk component shows no variation in the observations. A variable, intermediate-width (6000 km s^-1^) Balmer component is also found. These two components seem to arise by different processes.
展开▼
机译：我们研究了微弱，遥远的塞弗特1星系C16.16在高和低活动状态下的光谱。即使在高光谱状态下，也观察到强大的恒星种群对连续体的贡献。低电离发射线显示出较大的等效宽度。窄线比率用于参数化和研究窄线区域中的物理条件。具有氮耗竭，典型的活性银河原子核（AGN）的电离连续性和电离参数U = 10 ^ -2.8 ^的光电离模型可再现观察到的细线。 AGN连续体显示出很大的变化，而Balmer线变化适中。巴尔默线具有双峰结构的宽且不对称的分量。使用起源于相对论圆盘的发射线的轮廓，我们成功地拟合了观测到的宽Hα轮廓。该磁盘组件在观察结果中没有显示变化。还发现了可变的中等宽度（6000 km s ^ -1 ^）Balmer分量。这两个组件似乎是由不同的过程引起的。
展开▼
