平谱射电类星体QSO B507+179的光变特性分析  

Characteristics Analysis of Light-Curve of FSRQ QSO B507-179

作　　者：龚云露 易庭丰 杨星 常鑫 李永 GONG Yun-lu;YI Ting-feng;YANG Xing;CHANG Xin;LI Yong(School of Physics and Electronic Information,Yunnan Key Laboratory of High Energy Astrophysics,Yunnan Normal University,Kunming 650500,China;Guangxi Key Laboratory of Relativity Astrophysics,Nanning 530004,China)

机构地区：[1]云南师范大学物理与电子信息学院云南省高校高能天体物理重点实验室,昆明650500 [2]广西相对论天体物理重点实验室,南宁530004

出　　处：《德州学院学报》2020年第4期7-11,共5页Journal of Dezhou University

基　　金：国家自然科学基金(11863007).

摘　　要：基于Owens Valley Radio Observatory (OVRO) 40米望远镜观测数据库,研究收集了平谱射电类星体QSO B507+179在15 GHz射电波段的数据.其射电光变曲线(约12年)表明QSO B507+179在射电波段流量变化是比较剧烈的.利用历元折叠法和加权小波Z变换(Weight Wavelet Z-transform,WWZ)方法,分析了QSO B507+179天体15 GHz射电波段的光变周期,发现该天体具有2.08±0.11年的光变周期.用DCF方法对多波段流量Fγ与FO、Fγ与FR的相关性进行分析,发现Fγ与FO之间具有很强的相关性,而Fγ与FR之间无相关性.最后利用薄吸积盘理论估算了其中心黑洞质量的下限为M≈4.6×10^8M⊙.Basing on the Owens Valley Radio Observatory(OVRO)40-meter telescope observation database,we collected data on the flat-spectrum radio quasar QSO B507+179 in the 15 GHz radio band.The radio optical curve(about 12 years)shows that the flow rate change of QSO B507+179 in the radio wave band is relatively dramatic.Using the epoch-folding method and the weighted wavelet Z-transform(WWZ)method,we analyzed the optical change period of the QSO B507+179 celestial body in the 15 GHz radio wave band and found that the celestial body had an optical change period of 2.11±0.15 years.Using the DCF method to analyze the correlation between multi-band flow Fγand FO,Fγand FR,it is found that Fγand FO have a strong correlation,but Fγand FR have no correlation.Finally,the thin accretion disk theory is used to estimate the lower limit of the mass of the central black hole as M≈4.6×10^8M⊙.

关 键 词：B507+179 历元折叠法 加权小波Z变换方法 DCF方法 

分 类 号：P157[天文地球—天文学]