基于欧文斯谷射电天文台(Owens Valley Radio Observatory,OVRO)40 m望远镜近12年的观测数据,从中收集了类星体J0132+4325在15 GHz射电波段的光变曲线数据,利用LSP和加权小波Z变换方法分析其光变准周期.结果发现,类星体CGRaBS J0132+432...基于欧文斯谷射电天文台(Owens Valley Radio Observatory,OVRO)40 m望远镜近12年的观测数据,从中收集了类星体J0132+4325在15 GHz射电波段的光变曲线数据,利用LSP和加权小波Z变换方法分析其光变准周期.结果发现,类星体CGRaBS J0132+4325存在一个约851±80天的准周期振荡.基于红噪声蒙特卡洛模拟来估算其准周期信号的置信水平,得到其置信度超过3σ(99.7%).展开更多
In this paper,the time series analysis method CLEANest is employed to search for characteristic periodicities in the radio light curves of the blazar NRAO 530 at 4.8,8.0 and 14.5 GHz over a time baseline of three deca...In this paper,the time series analysis method CLEANest is employed to search for characteristic periodicities in the radio light curves of the blazar NRAO 530 at 4.8,8.0 and 14.5 GHz over a time baseline of three decades.Two prominent periodicities on time scales of ～6.3 and ～9.5 a are identified at all three frequencies,in agreement with previous results derived from different numerical techniques,confirming the multiplicity of the periodicities in NRAO 530.In addition to these two significant periods,there is also evidence of shorter-timescale periodicities of ～5.0,～4.2,～3.4 and ～2.8 a showing lower amplitude in the periodograms.The physical mechanisms responsible for the radio quasi-periodic oscillations and the multiplicity of the periods are discussed.展开更多
文摘基于欧文斯谷射电天文台(Owens Valley Radio Observatory,OVRO)40 m望远镜近12年的观测数据,从中收集了类星体J0132+4325在15 GHz射电波段的光变曲线数据,利用LSP和加权小波Z变换方法分析其光变准周期.结果发现,类星体CGRaBS J0132+4325存在一个约851±80天的准周期振荡.基于红噪声蒙特卡洛模拟来估算其准周期信号的置信水平,得到其置信度超过3σ(99.7%).
基金supported by the National Basic Research Program of China (Grant Nos.2009CB24900 and 2012CB821800)the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDA04060700)+1 种基金the National Natural Science Foundation of China (Grant No.61261017)The University of Michigan Radio Astronomy Observatory is supported by the funds from NSF,NASA,and the University of Michigan
文摘In this paper,the time series analysis method CLEANest is employed to search for characteristic periodicities in the radio light curves of the blazar NRAO 530 at 4.8,8.0 and 14.5 GHz over a time baseline of three decades.Two prominent periodicities on time scales of ～6.3 and ～9.5 a are identified at all three frequencies,in agreement with previous results derived from different numerical techniques,confirming the multiplicity of the periodicities in NRAO 530.In addition to these two significant periods,there is also evidence of shorter-timescale periodicities of ～5.0,～4.2,～3.4 and ～2.8 a showing lower amplitude in the periodograms.The physical mechanisms responsible for the radio quasi-periodic oscillations and the multiplicity of the periods are discussed.
