论文标题
部分可观测时空混沌系统的无模型预测
Parameterizing the AGN radius -- luminosity relation from the Eigenvector 1 viewpoint
论文作者
论文摘要
使用混响映射对宽线区域（BLR）的研究使我们能够在发射区域的大小与驱动线排放的连续亮度之间建立经验关系（即r $ _ {\ rm blr} $ - l $ _ {\ l $ _ {\ rm 5100} $相关）。为了实现其全部潜力，r $ _ {\ rm blr} $ - l $ _ {\ rm 5100} $之间的固有分散需要更好地理解。爱丁顿的比率在解决这个问题方面起着关键作用。另一方面，特征向量1模式有助于揭示了Eddington比率与具有BLR起源的光学FEII发射强度之间几乎明确的联系。本文旨在揭示BLR的电离参数（U）和云平均密度（n $ _ {\ rm H} $）之类的理论实体之间的联系，并直接从光谱中获得了物理可观察力，例如光学FEII强度（R $ _ {\ rm feii} $），以追踪具有重量率的率。我们利用光电离心代码的浑浊，并执行一套模型来揭示U-N参数空间中的BLR并估算RFEII。在这项研究中，我们分别比较了原型人口A和人群B源I ZW 1和NGC 5548的SED。光电离建模的结果与现有的混响映射源与观察到的r $ _ {\ rm feii} $估计值相结合，使我们能够提供一个分析公式以将上述数量绑在一起。我们利用模型的等效宽度将低离子化发射线与观察值进行比较，以识别最佳（u，n $ _ {\ rm h} $）。 BLR中正确的物理条件的恢复表明，BLR“看到”不同的，过滤的电离连续体，仅分数很小（〜1-10％），从而导致无尘，低离子化BLR的线发射。
The study of the broad-line region (BLR) using reverberation mapping has allowed us to establish an empirical relation between the size of this line emitting region and the continuum luminosity that drives the line emission (i.e. the R$_{\rm BLR}$-L$_{\rm 5100}$ relation). To realize its full potential, the intrinsic scatter in the R$_{\rm BLR}$-L$_{\rm 5100}$ relation needs to be understood better. The Eddington ratio plays a key role in addressing this problem. On the other hand, the Eigenvector 1 schema has helped to reveal an almost clear connection between the Eddington ratio and the strength of the optical FeII emission which has its origin from the BLR. This paper aims to reveal the connection between theoretical entities, like, the ionization parameter (U) and cloud mean density (n$_{\rm H}$) of the BLR, with physical observables obtained directly from the spectra, such as optical FeII strength (R$_{\rm FeII}$) that has immense potential to trace the accretion rate. We utilize the photoionization code CLOUDY and perform a suite of models to reveal the BLR in the U-n parameter space and estimate RFeII. We compare the SEDs for a prototypical Population A and Population B source, I Zw 1 and NGC 5548, respectively, in this study. The results from the photoionization modelling are combined with existing reverberation mapped sources with observed R$_{\rm FeII}$ estimates, allowing us to provide an analytical formulation to tie together the aforementioned quantities. We utilize the comparison of the modelled equivalent widths for the low-ionization emission lines to their observed values to identify the optimal (U,n$_{\rm H}$). The recovery of the correct physical conditions in the BLR suggests that the BLR `sees' a different, filtered ionizing continuum with only a very small fraction (~1-10%) that leads to the line emission in the dustless, low-ionization BLR.
