尽管在过去的三十年里，许多学者对活动星系核窄线区的性质进行了深入的研究，但仍有许多问题有待解决。这项工作的主要目标是探索NLR的Seyfert星系收集大量的统计光谱样本的Seyfert 2和中间型Seyfert星系具有高的信噪比，以利用大量的发射线进行精确测量。2153 Seyfert 2和521 Intermediate-type Seyfert光谱是从Sloan Digital Sky Survey - Data Release 7（SDSS-DR 7）中选择的，并带有基于氧发射线比率的诊断图。所有的发射线，包括广泛的组成部分，是通过一个自行开发的代码，扣除恒星成分后测量。确定了每个物体的物理参数，如内部红化、电离参数、温度、密度、气体和恒星速度色散。此外，我们还估算了NLR的质量和半径，电离气体的动能，以及黑洞的吸积率。从发射线分析和估算的物理性质来看，Seyfert 2和Intermediate-Seyfert星系的NLR相似。唯一的区别，较低的消光，气体运动学一般不占主导地位的宿主星系的引力势和较高的百分比[O III]5007蓝色不对称的中间-塞弗特可以归因于我们的视线相对于环面轴倾斜的影响。
英文摘要：
Although the properties of the narrow-line region (NLR) of active galactic nuclei(AGN) have been deeply studied by many authors in the past three decades, many questions are still open. The main goal of this work is to explore the NLR of Seyfert galaxies by collecting a large statistical spectroscopic sample of Seyfert 2 and Intermediate-type Seyfert galaxies having a high signal-to-noise ratio in order to take advantage of a high number of emission-lines to be accurately measured. 2153 Seyfert 2 and 521 Intermediate-type Seyfert spectra were selected from Sloan Digital Sky Survey - Data Release 7 (SDSS-DR7) with a diagnostic diagram based on the oxygen emission-line ratios. All the emission-lines, broad components included, were measured by means of a self-developed code, after the subtraction of the stellar component. Physical parameters, such as internal reddening, ionization parameter, temperature, density, gas and stellar velocity dispersion were determined for each object. Furthermore, we estimated mass and radius of the NLR, kinetic energy of the ionized gas, and black-hole accretion rate. From the emission-line analysis and the estimated physical properties, it appears that the NLR is similar in Seyfert 2 and Intermediate-Seyfert galaxies. The only differences, lower extinction, gas kinematics in general not dominated by the host galaxy gravitational potential and higher percentage of [O III]5007 blue asymmetries in Intermediate-Seyfert can be ascribed to an effect of inclination of our line of sight with respect to the torus axis.
Distribution of the heavy elements throughout the extended narrow line region of the Seyfert galaxy NGC 7212
本文用考虑活动核和激波光电离的模型分析了Seyfert 2星系NGC 7212的扩展窄线区（ENLR）发射的线谱和连续谱的最新观测结果。结果表明，在圆锥体的边缘和外部有较高的激波速度（500- 800 \kms），模型推算的活动星系核流量在Lyman极限下低于$10^{-11}$光子cm $^{-2}$ s $^{-1}$ eV $^{-1}$，这是低光度活动星系核的典型特征，而在Seyfert 2星系中则不然。震前密度是ENLR的特征，范围在80- 150 cm $^{-3}$之间。氮和硫的贫化系数低于2，特别是在东部边缘。氧气在几个地方耗尽。Fe/H比值接近太阳值，而Ne/H相对丰度异常高，为太阳值的1.5- 2倍。通过模拟连续谱能量分布（SED），我们发现在激波前沿由费米机制产生的射电同步辐射，而X射线则是由相对高温的等离子体产生的韧致辐射。
Narrow-Line Seyfert 1 Galaxies in the Dark Energy Spectroscopic Instrument Data Release 1
Inter-University Centre for Astronomy and Astrophysics (IUCAA)（大学间天文与天体物理中心）；Aryabhatta Research Institute of Observational Sciences（阿耶波多观测科学研究所以）；Universidad Complutense de Madrid（马德里康普顿斯大学）；Universität Bielefeld（比勒费尔德大学）；Assam Don Bosco University（阿萨姆唐博斯科大学）；Indian Institute of Astrophysics（印度天体物理研究所）
