处理相关光变时间延迟的新方法

A New Method to Calculate the Time Delays in Blazars

时间延迟相关函数(Time Delay Correlation Function,TDCF)方法是一种可以计算时间序列时间延迟的新方法,利用该方法计算blazar天体0316+413(NGC 1275)3个射电波段(4.8 GHz、8 GHz和14.5 GHz)的时间延迟并进行另外7个blazar源的多波段相关分析.对0316+413的计算结果表明:4.8 GHz光变延迟8 GHz光变410 d,即τ_(4.8-8)=410 d;4.8 GHz光变延迟14.5 GHz光变440 d,τ_(4.8-14.5)=440 d;8 GHz光变延迟14.5 GHz光变30 d,即τ_(8-14.5)=30 d;通过7个blazar天体的多波段相关分析,和离散相关函数(Discrete Correlation Function,DCF)方法相比,利用TDCF方法获得时间延迟是更加合理的.

In this paper, a new method -- TDCF （Time Delay Correlation Function） method, is introduced to calculate the time delays of multi-band data in blazars. This method is adopted to analyze the time delays of the radio source 0316＋413 and the correlation analysis of the other seven blazars. The results show that the light curve of 0316＋413 at 4.8 GHz lags about 410 days behind that at 8 GHz, the light curve at 4.8 GHz lags 440 days behind that at 14.5 GHz and the light curve at 8 GHz lags about 30 days behind that at 14.5 GHz. It is very reasonable to use the TDCF method to carry out the correlation analysis of the time delays of the other seven blazars.