6颗Blazar天体的长期光变和色指数变化  

Long Term Variability and Color Index Variability of 6 Blazar Objects

作　　者：胡绍明[1] 张雄[2] 

机构地区：[1]山东大学威海分校空间科学与应用物理系 [2]云南师范大学物理与电子信息学院,云南昆明650092

出　　处：《天文研究与技术》2007年第2期102-107,共6页Astronomical Research & Technology

基　　金：国家自然科学基金天文联合基金(10778619)资助项目;山东大学威海分校青年成长基金支持项目

摘　　要：文中对6颗Blazar天体15年间的大量准同时性观测数据进行了处理分析,获得了长期的光变曲线和色指数变化曲线。对比分析光变曲线和色指数变化曲线,对色指数和亮度做相关分析,得出Blazar天体的光变包括长期的单色光变和有颜色变化的短期爆发两种成份,由光变的颜色差异我们提出引起Blazar天体光变的物理机制可能是几何效应调制的激波喷流模型。Lots of quasi-simultaneous observations for 6 Blazar objects over 15 years were processed and analyzed in this paper. The curves of variability and color index variability were obtained. The variabilties of color indices were analyzed intensively. According to the correlation analysis between the color indices and the magnitudes, we concluded that the variability of Blazar objects contained the long term achromatic variability and chromatic short flares by comparing the light curves and the curves of color index variability. It is indicated that the shock-in-jet model modulated by geometrical effect may be the physical mechanism for Blazar variability based on the difference for the color variability.

关 键 词：BLAZAR天体 光变 色指数 爆发 

分 类 号：P157.7[天文地球—天文学]