论文标题
咖啡馆项目：活跃星系中的光学Fe II和近红外CA II三胞胎发射：（i）光电离建模
The CaFe Project: Optical Fe II and Near-Infrared Ca II triplet emission in active galaxies: (I) Photoionization modelling
论文作者
论文摘要
光学Fe II发射是源自广泛区域（BLR）的类星体光谱中的强大特征。理解复杂的Fe II伪胞元的困难使我们搜索了其他可靠的，更简单的离子物种，例如Ca II。在该系列的第一部分中，我们从观测和光电离模型中确认了两个发射特征的强度（光学Fe II和NIR CA II）之间的强相关性。通过使用光学FE II和NIR CA II测量值包括最新的观测值，我们跨越了更宽，更扩展的参数空间，并使用Cludy的光电离心模型确认了这两个光谱特征的共同起源。考虑到灰尘对我们的建模的影响，我们将BLR参数空间（主要是根据电离参数和局部云密度）限制为Fe II和Ca II发射的强度的函数。
Optical Fe II emission is a strong feature in quasar spectra originating in the broad-line region (BLR). The difficulty in understanding the complex Fe II pseudo-continuum has led us to search for other reliable, simpler ionic species such as Ca II. In this first part of the series, we confirm the strong correlation between the strengths of two emission features, the optical Fe II and the NIR Ca II, both from observations and photoionization modelling. With the inclusion of an up-to-date compilation of observations with both optical Fe II and NIR Ca II measurements, we span a wider and more extended parameter space and confirm the common origin of these two spectral features with our photoionization models using CLOUDY. Taking into account the effect of dust into our modelling, we constrain the BLR parameter space (primarily, in terms of the ionization parameter and local cloud density) as a function of the strengths of Fe II and Ca II emission.
