Periodic radio variability in NRAO 530:phase dispersion minimization analysis  

作　　者：Jun-Chao Lu Jun-Yi Wang Tao An Ji-Ming Lin Hong-Bing Qiu 

机构地区：[1]Key Laboratory of Cognitive Radio&Information Processing,the Ministry of Education,GuilinUniversity of Electronic Technology,Guilin 541004,China [2]School of Mathematics and Computational Science,Xiangtan University,Xiangtan 411105,China [3]Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China [4]Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Nanjing 210008,China

出　　处：《Research in Astronomy and Astrophysics》2012年第6期643-650,共8页天文和天体物理学研究（英文版）

基　　金：supported by the National Basic Research Programof China (973 Program,2009CB24900);the Guangxi Natural Science Foundation (0991018Z);the Science and Technology Commission of Shanghai Municipality (06DZ22101);supported by a grant from the Chinese Academy of Sciences;a visitor grant from the The Netherlands Science Foundation;supported by funds from the NSF,NASA,and the University of Michigan

摘　　要：A periodicity analysis of the radio light curves of the blazar NRAO 530 at 14.5, 8.0, and 4.8 GHz is presented employing an improved phase dispersion mini- mization technique. The result, which shows two persistent periodic components of 6 and ~ 10 yr at all three frequencies, is consistent with the results obtained with the Lomb-Scargle periodogram and weighted wavelet Z-transform algorithms. The reliability of the derived periodicities is confirmed by the Monte Carlo numerical sim- ulations which show a high statistical confidence. （Quasi-）Periodic fluctuations of the radio luminosity of NRAO 530 might be associated with the oscillations of the accre- tion disk triggered by hydrodynamic instabilities of the accreted flow.A periodicity analysis of the radio light curves of the blazar NRAO 530 at 14.5, 8.0, and 4.8 GHz is presented employing an improved phase dispersion mini- mization technique. The result, which shows two persistent periodic components of 6 and ~ 10 yr at all three frequencies, is consistent with the results obtained with the Lomb-Scargle periodogram and weighted wavelet Z-transform algorithms. The reliability of the derived periodicities is confirmed by the Monte Carlo numerical sim- ulations which show a high statistical confidence. （Quasi-）Periodic fluctuations of the radio luminosity of NRAO 530 might be associated with the oscillations of the accre- tion disk triggered by hydrodynamic instabilities of the accreted flow.

关 键 词：methods： statistical -- galaxies： active -- galaxies： quasar： individual：NRAO 530 

分 类 号：TN92[电子电信—通信与信息系统] TN791.02[电子电信—信息与通信工程]