论文标题
Seyfert 2 Agns $-$ ii的化学丰度。基于SDS的N2金属校准
Chemical abundances of Seyfert 2 AGNs $-$II. N2 metallicity calibration based on SDSS
论文作者
论文摘要
我们介绍了Seyfert 2的金属性（$ Z $）活性银河核与$ n2 $ = log（[n ii] $λ$ 6584/h $α$）发射线强度比之间的半经验校准。该校准通过[O III] $λ$ 5007/[O II] $λ$ 3727与$ n2 $图表得出，其中包含观测数据和光电离世模型结果，该模型用云代码获得。观察样品由463个确认的Seyfert 2核（Redshift $ Z <0.4 $）组成，从Sloan Digital Sky Survey DR7数据集中获取。获得的$ z $ - $ n2 $关系对于$ 0.3 <（z/z {\ odot}）<2.0 $有效，该$对应于$ -0.7 <\：（n2）<0.6 $。改变电离参数（$ U $），电子密度和光谱能量分布的斜率对$ z $估计的影响是由$ n2 $的错误测量产生的不确定性的顺序。该结果表明我们$ z-N2 $校准的可靠性很大。 $ U $与[O III]/[O II]线比之间的关系几乎与其他Nebular参数无关。
We present a semi-empirical calibration between the metallicity ($Z$) of Seyfert 2 Active Galactic Nuclei and the $N2$=log([N II]$λ$6584/H$α$) emission-line intensity ratio. This calibration was derived through the [O III]$λ$5007/[O II]$λ$3727 versus $N2$ diagram containing observational data and photoionization model results obtained with the Cloudy code. The observational sample consists of 463 confirmed Seyfert 2 nuclei (redshift $z < 0.4$) taken from the Sloan Digital Sky Survey DR7 dataset. The obtained $Z$-$N2$ relation is valid for the range $0.3 < (Z/Z_{\odot}) < 2.0$ which corresponds to $-0.7 < \: (N2) < 0.6$. The effects of varying the ionization parameter ($U$), electron density and the slope of the spectral energy distribution on the $Z$ estimations are of the order of the uncertainty produced by the error measurements of $N2$. This result indicates the large reliability of our $Z-N2$ calibration. A relation between $U$ and the [O III]/[O II] line ratio, almost independent of other nebular parameter, was obtained.
