Blazar 的X射线谱性质

从Donato文献中选择了一个含有69个Blazar的样本，样本中每个源有多个X射线辐射流量数据，用该样本研究了流量密度和谱指数之间的关系，以及研究了三类源（HBL，LBL，FSRQ）的红移和谱指数的分布。结果表明：对于HBLs，谱指数和流量密度之间有一个较好的反相关关系存在，而对于LBLs和FSRQs却没有相关。因此认为HBL的X射线是同步辐射所致，而LBL和FSRQ的X射线辐射较为复杂可能是同步自康普顿过程导致。HBL显示软X射线谱，而FSRQ显示硬X射线谱，LBL居中。在谱图中HBL位于近端，rSRQ位于远端，LBL居中。

X-ray Spectral Properties for Blazars

A sample including 69 blazars is selected from the literature.Using the sample,the relations between the flux density and spectral index,the distributions of redshift and spectral index are investigated for the high frequency peaked BL Lac objects(HBLs),lowly frequency peaked BL Lac object(LBLs) and the flat spectral radio quasars(FSRQs) respectively.Our results show that(1) an anti-correlation is found between the spectral index and the flux density for HBLs,but there is no clear relations for LBLs or FSRQs,which suggest that the X-ray emission in HBLs are from the synchrotron process while that for LBLs and FSRQs from the synchrotron self-Compton process,(2) the X-ray spectral index has a consequence for the three subclasses with HBLs showing the softest X-ray spectral,and FSRQs,the hardest X-ray spectrum and LBLs being between them,and(3) HBLs locate at the nearest while FSRQs the furthest and LBLs being between them.