费米耀变体的多波段γ-ray辐射

Multi-Wavebandγ-ray Emissions of Fermi Blazars

从Fermi/LAT第3期源表(3FGL)中选取了920个Blazar样本,包含414个平谱射电源(Flat Spectrum Radio Quasar,FSRQ)和506个蝎虎天体(BL Lac object,BL Lac),其中有226个HBL,140个IBL和140个LBL.研究了所有Blazar样本及其子类FSRQ,BL Lac,HBL和LBL样本的射电1.4 GHz光度分别与γ-ray在0.1,0.3,1,3及10 GeV处光度之间的相关性。结果表明:对总样本及所有子类样本,1.4 GHz光度与γ-ray各频率处的光度均存在强的正相关性,但对于不同的子类样本,这种相关性随γ-ray频率的变化趋势不同;BL Lac的相关性好于FSRQ,而HBL的相关性与LBL相似。总的来说,随着γ-ray辐射频率的增加,相关性有减弱的趋势。但是,对于不同的样本,相关性随γ-ray频率增加有不同的变化趋势。因此,同一频率下不同子类Blazar的γ-ray辐射机制存在差异,同一样本在不同频率下的γ-ray辐射机制也有差异.在γ-ray辐射中,BL Lac的辐射来自同步自康普顿(SSC)过程的成分比FSRQ的多,而HBL的与LBL的相似.FSRQ的γ-ray辐射机制比BL Lac更为复杂。

A sample including 920 blazars is selected from Fermi/LAT 3FGL catalogue.There are 414 FSRQs and 506 BL Lacs(226 HBLs,140 IBLs,140 LBLs).The correlations between the luminosities of radio at 1.4 GHz and γ-ray at 0.1,0.3,1,3,10 GeV are investigated for whole blazars sample and the sub-samples of blazars,i.e.FSRQs,BL Lacs,HBLs and LBLs,respectively.The obtained results are as follows.There are strong positive correlations between them for all samples separately,but the correlation is different for different sample.The correlation for BL Lacs is better than that for FSRQs,while that for HBLs is similar to that for LBLs.On the whole,there is a trend that the correlation decreases with the increase of γ-ray frequency.However,the variation trend of correlation with γ-ray frequency is different for different samples.The γ-ray radiation mechanism for different sub-classes of blazars is different at the same frequency,and which for the same sample is different at different γ-ray frequency.In γ-ray emissions,the component from synchrotron self-Compton(SSC) process for BL Lacs is more than that for FSRQs,while that for HBLs is similar to that for LBLs.The γ-ray radiation mechanism for FSRQs is more complex than that for BL Lacs.