不同类Blazar的红移及谱指数统计特性

Statistical properties of different class Blazar for redshift and spectral indices

从Donato文献中选择了209个B lazar源,其中96个HBL,45个LBL,68个FSRQ.研究了该样本源中3类(HBLs,LBLs,FSRQs)B lazars的红移(z)及X射线谱指数(α)的分布特性,对分布做了K-S检验,比较了3类源的统计特性.结果显示HBLs有较小的红移和较大的X射线谱指数,FSRQs有较大的红移和较小的谱指数,而LBLs居中;3类源之间的红移和谱指数相关在K-S检验中有完全相同的规律.从研究结果可以得出HBL、LBL及FSRQ是有不同物理属性的3类B lazar,HBL与LBL、FSRQ有明显地不同,而LBL与FSRQ却没有明显地不同;LBL似乎是HBL和FS-RQ的中间状态,同时也显示HBL/LBL是较XBL/RBL更好的一种分类方法.

A large sample including 209 Blazars was selected from Donato＇s paper, including 96 HBLs, 45 LBLs and 68 FSRQs. The distributions of three class （ HBLs, LBLs and FSRQs） Blazars for their redshift（z） and X-ray spectral indices（α） were studied, and K-S test were done, the statistical properties were compared also. The results showed that the averaged redshift of HBLs was smaller than those of LBLs and FSRQs, and the averaged spectral indices of HBLs was bigger than those of LBLs and FSRQs, but FSRQs＇was contrary. LBLs＇redshift and spectral index were in the middle of HBLs and FSRQs. There was the same order for the correlations of z and α among HBLs, LBLs and FSRQs. The main conclusions showed as follows： that HBLs were significantly different from LBLs and FSRQs, but LBLs were not significantly different from FSRQs. This maybe caused by different origin mechanism for HBLs and LBLs. It seemed that the LBLs was the middle state of HBLs and FSRQs. The classification of HBLs and LBLs was much better and had more physical significance than the classification of XBLs and RBLs. HBLs and LBLs were two kinds of Blazars having different physical properties.