蝎虎天体的有效谱指数研究

搜集了一个含20个BL Lac天体的样本,计算了样本的射电、X射线及γ射线之间的宽带谱指数(αRX,αRG,αXG),并讨论了这些谱指数之间的相互关系.平均有效谱指数分别为<αRX>=0.721±0.027,<αXG>=0.946±0.032,<αRG>=0.820±0.008.αRX和αXG之间有强相关,相关系数r=-0.85,置信度P<10-4.αRX和αRG之间有弱相关,而αXG和αRG之间没有相关.这些关系说明BL Lac天体的射电、X射线辐射均与γ射线辐射相关联.分析可知γ射线辐射应来自同步自康谱顿辐射.

The Study on Effective Spectrum Index for BL Lac Objects

The radio,X-ray and γ-ray emissions are compiled for a simple of 20 BL Lacertae objects(BL Lacs)to calculate the effective spectrum indices,namely the radio-X-ray spectrum index,αRX,the radio-γ-ray spectrum index,αRX and the X-ray to γ-ray spectrum index,αRG.Also the relations among αRX,αRG and αXG are investigated.The average value of broadband spectral index for 20 BL acs<αRX>=0.721±0.027,<αXG>=0.946±0.032,<αRG>=0.820±0.008.There is a strong correlation between αRX and αXG,with a correlation coefficient of γ=-0.85 and a chance probability of P<10-4.There is a weak correlation between αRX and αRG,while there is no correlation between αXG and αRG.The results show that the γ-ray emis-sions are associated with both radio and X-ray emissions in BL Lacs.The γ-ray emissions are likely from the SSC process.