Gaia-Fermi耀变体的伽马射线与光学波段相关性研究

Study on the Correlation between Gamma Ray and Optical Band of Gaia-Fermi Blazars

通过将Gaia卫星第二批光学波段数据(DR2)与Fermi卫星第三批伽马射线波段数据(3FGL)进行交叉匹配,得到629个BL Lac天体、470平谱射电类星体(FSRQ)以及459个未确定亚类型的耀变体(BCU).对这些耀变体的G波段、G BP波段、G RP波段和伽马射线波段的流量及光变指数进行了线性相关性分析,结果表明伽马射线与光学波段辐射流量有很强的相关性,而伽马射线的光变指数与光学波段的辐射流量相关性较弱.在三个子样本中,BL Lac天体的各个波段的相关性最强,FSRQ的相关性次之,BCU的相关性最弱.

In this paper,629 BL Lacs,470 flat spectrum radio quasars(FSRQs)and 459 blazar candidates of uncertainty(BCUs)are obtained by cross matching the second optical band data(DR2)released by Gaia satellite in 2018 and the third gamma ray band data(3FGL)released by Fermi satellite in 2015.This is a large sample of the latest optical data of the blazar(Gaia-Fermi blazars).We have made a linear correlation analysis on the flux and the optical variability index of the G-band,G BP band and G RP band of these blazars.Our analysis results show that there is a strong correlation between the gamma ray and the optical radiation flux,while the correlation between the optical variability index of the gamma ray and the optical band radiation flux is weak.Among the three sub samples,BL Lacs multi-wavelength data has the strongest correlation,FSRQs the second,BCUs the weakest.