RGD及NLSY1伽马波段的流量分布及RMS-Flux关系研究

Research on the Flux Distribution and RMS-Flux Relationship of RGD and NLSY1 in the Gamma Band

研究了Fermi-LAT第4期目录中的射电星系(Radio galaxy,RDG)以及窄线型赛弗特星系1(Narrow-line Seyfert 1,NLSY1)的γ射线流量分布特征及均方根-流量(RMS-Flux)的线性关系。基于这两类活动星系核的γ射线流量数据处理,用高斯函数和对数正态函数对其流量分布进行了拟合。通过K-S检验(Kolmogorov-Smirnov test)、S-W检验(Shapiro-Wilk test)及约化卡方(Reduced χ^(2))发现,射电星系及窄线型赛弗特星系1的分布都更加符合对数正态分布而非高斯分布,这表明其光变可能具有非线性和乘法性质。此外,还分别对这两类源的两种不同分组的均方根-流量关系进行了线性拟合,发现了均方根-流量有极强的线性相关性且斜率都为正。

We study the characteristics of radio galaxy(RDG)and Narrow line Seyfert 1(NLSY1)in the fourth Fermi LAT catalogue,the distribution characteristics of γ-ray flux and the RMS-Flux linear relationship.Based on these two types of active galactic nuclei in the data processing of γ-ray flux,the Gaussian function and log-normal distribution function are used to fit the flux distribution.By K-S test,S-W test,and reduced chi square χ^(2).It is found that the distributions of RDG and NLSY1 are more consistent with the log-normal distribution than the Gaussian distribution,which indicates that their light variability may have nonlinear and multiplicative properties.In addition,linear fitting is also performed on two different groups of RMS-Flux for these two types of sources,and it is found that RMS-Flux has a strong linear correlation and its slopes are both positive.