BL Lac天体的γ射线和射电辐射的统计特性

Statistical characteristics of gamma ray and radio emission of BL Lac object

给出了一个带有射电5.0 GHz,8.4 GHz和γ射线辐射流量密度的22个γ噪BL Lac天体的样本,研究了它们在1 GeV处的γ射线辐射流量密度最大值、平均值及最小值与射电5.0 GHz,8.4 GHz辐射流量之间的可能关系.结果表明:1)射电5.0 GHz,8.4 GHz辐射与γ射线辐射在低态时没有相关,但在高态和平均态时都存在较强的相关,最大相关系数r=0.85,置信度均好于10-4;2)γ射线谱指数和射电谱指数之间也有一个弱相关关系存在.因此,认为γ射线的辐射主要是同步自康普顿辐射.

A sample including 22 BL Lac objects was collected.The possible correlations between the γ-ray emission at 1 GeV and the radio emission at 8.4GHz or 5.0GHz were investigated.Main results are as follows： 1） for minimum γ-ray data,there is no correlation between γ-ray and radio flux density.For maximum and average data,there are good correlations between γ-ray and radio emissions,with the maximum correlation coefficient reaching 0.85,and the chance probability p〈10^-4;2） there are weak correlations between γ-ray spectral index and the radio spectral index.Therefore,the γ-ray radiation was the SSC process.