论文标题
建模局部1型AGN的最强硅酸盐发射特征
Modelling the strongest silicate emission features of local type 1 AGN
论文作者
论文摘要
我们在67个局部（$ z <0.1 $）的样品中测量10和$18μ$ M的硅酸盐特征，其中1型活动的银河系核（AGN），可用{\ it Spitzer}光谱以非固有过程为主导。我们发现，$10μ$ M硅酸盐的特征以$ 10.3^{+0.7} _ { - 0.9}μ$ m具有强度（Si $ _ {p} $ = ln f $ _ {p} $（spectrum）/f $ _ {p} $ {p} $} $ 0.11^$ 0.11^$ 0.11^{+0.11^{+0.11^{p} $} $18μ$ m的一个峰值为$ 17.3^{+0.4} _ { - 0.7}μ$ m，强度为$ 0.14^{+0.06} _ { - 0.06} $。我们从最强的10 $ $ m硅酸盐强度（$σ_{si_ {10μm}}}> 0.28 $，10个对象）中选择。我们通过比较几个假设不同的几何形状和灰尘组成的模型来对IRS/{\ it Spitzer}光谱进行详细的建模：光滑的圆环模型，两个巧克力的圆环模型，两相培养基的圆环模型以及磁盘+流出+流出的模型。我们发现硅酸盐特征是由Nenkova等人的块状模型很好地建模的。 2008年，在所有模型中，包括流出和复杂的灰尘组成是最好的（Hoenig etal。2017）。我们注意到，即使在AGN主导的星系中，通常也有必要添加出色的贡献以在最短波长下重现发射。
We measure the 10 and $18μ$m silicate features in a sample of 67 local ($z<0.1$) type 1 active galactic nuclei (AGN) with available {\it Spitzer} spectra dominated by non-stellar processes. We find that the $10μ$m silicate feature peaks at $10.3^{+0.7}_{-0.9}μ$m with a strength (Si$_{p}$ = ln f$_{p}$(spectrum)/f$_{p}$(continuum)) of $0.11^{+0.15}_{-0.36}$, while the $18μ$m one peaks at $17.3^{+0.4}_{-0.7}μ$m with a strength of $0.14^{+0.06}_{-0.06}$. We select from this sample sources with the strongest 10$μ$m silicate strength ($σ_{Si_{10μm}}>0.28$, 10 objects). We carry out a detailed modeling of the IRS/{\it Spitzer} spectra by comparing several models that assume different geometries and dust composition: a smooth torus model, two clumpy torus models, a two-phase medium torus model, and a disk+outflow clumpy model. We find that the silicate features are well modeled by the clumpy model of Nenkova et al. 2008, and among all models those including outflows and complex dust composition are the best (Hoenig et al. 2017). We note that even in AGN-dominated galaxies it is usually necessary to add stellar contributions to reproduce the emission at the shortest wavelengths.
