耀变体CGRaBS J0835+6835的射电准周期振荡及多普勒因子分析

Radio Quasi-period Oscillation Analysis of Blazar CGRaBS J0835+6835

基于欧文斯谷射电天文台(Owens Valley Radio Observatory,OVRO)40 m望远镜观测数据,收集了耀变体CGRaBS J0835+6835在15 GHz射电波段约12年的数据。利用LSP(Lomb-Scargle Periodogram)方法和加权小波Z变换(Weight Wavelet Z-transform,WWZ)方法检测到了CGRaBS J0835+6835存在一个560天左右的准周期震荡(Quasi-Periodic Oscillation,QPO)。运用超大质量双黑洞(Super Massive Binary Black Hole,SMBBH)系统中的螺旋喷流模型估算了它的主黑洞质量的范围约为3.7×108 M⊙~3.5×109 M⊙。为了探究此源是否存在聚束效应,使用双指数函数拟合6个爆发过程,发现光变多普勒因子δV的平均值约为10.76,这表明此源的射电辐射存在明显的聚束效应。

Based on the Owens Valley Radio Observatory(OVRO)40 m telescope observation database,we collected data from the blazar CGRaBS J0835+6835 in the 15 GHz radio band(approximately 12 years).Using the Lomb-Scargle periodogram(LSP)method and the Weight Wavelet Z-transform(WWZ)method,we detected a quasi-period oscillation of about 560 days in the CGRaBS J0835+6835 object.We used a helical jet model in the supermassive dual black hole system to estimate the mass range of its primary black hole,and the range is 3.7×108 M⊙to 3.5×109 M⊙.To investigate whether there is a beam effect in this source,we used a double exponential function to fit six burst processes and found that the average value of the variability Doppler factorδV is about 10.76.This result indicates there is a significant beam effect in the radio radiation of this source.