BL Lac天体PKS 0537-441的光变特性分析  

The Variability Analysis of BL Lac Objects PKS 0537-441

作　　者：王文广[1] 张皓晶[1] 王雪品 李丙郎 

机构地区：[1]云南师范大学物理与电子信息学院,云南昆明650500

出　　处：《云南师范大学学报（自然科学版）》2016年第4期1-7,共7页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：云南省教育厅基金资助项目(2014Z048);云南省自然科学基金资助项目(2012FB140)

摘　　要：收集了耀变体PKS 0537-441近11年红外和光学波段的光变数据,光变曲线表明PKS0537-441天体存在剧烈变化.利用功率谱方法和Jurkevich方法分析了PKS 0537-441各个波段的光变周期,发现其可能存在1 038d和583d的光变周期.若该源的长周期光变与吸积盘有关,则得到不稳定的区域为R=14.9Rg.用DCF方法对这几个波段的相关性进行分析,结果显示光学和红外之间有延时同时表现出很强的相关性,这表明它们的辐射区域不同但辐射过程是一致的.In this paper,the light curves of the blazar PKS 0537-441 over past 11 years at infrared and optical band variability were collected. The light curve shows that the blazar PKS 0537- 441 is a very active variation. The period of the PKS 0537-441 of each band were studied by using the power spectrum estimation method and the Jurkevich method. They revealed the existence of periods of 1 038 days and 583 days in the source variability. Considering that there is a relation between the origin of periodicity and accretion disk,we use this periodicity to obtain the unstable region lying at R=Rg. We used DCF method to analyze the correlation of several band. The results showed a time delay between optical and infrared,but they still have strong correlation. It suggests that their radiation area are different but the radiation process are the same.

关 键 词：PKS 0537—441 光变周期 功率谱方法 JURKEVICH方法 DCF方法 

分 类 号：P14[天文地球—天体物理]