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Periodic radio variabilities of the blazar 1156+295: harmonic oscillations
Wang, Jun-Yi1,2; An, Tao3,4; Baan, Willem A.3; Lu, Xiang-Long2
2014-09-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号443期号:1页码:58-66
摘要(Quasi)-periodic oscillations of the radio luminosity of a typical blazar 1156+295 were analysed to investigate the dynamic processes associated with the central engine of the active galactic nucleus. Three numerical techniques, the Lomb-Scargle periodogram, the Weighted Wavelet Z-transform and the improved Phase Dispersion Minimization, were used to search for candidate periodicities in the radio light curves of 1156+295 at 14.5, 8.0 and 4.8 GHz. The results of these methods are consistent with the detection of four periodic components with characteristic periods of similar to 1.7 (P-4), similar to 2.4 (P-3), similar to 3.4 (P-2) and similar to 7.5 yr (P-1), which suggest a harmonic relationship in frequency of 4: 3: 2: 1 with f(1) as the fundamental frequency. Except for the fact that P-1 persistently shows in the whole time span, the three others appear intermittent and are only prominent during certain time ranges. The second harmonic mode (P-2) is most powerful at all three observing frequency bands. The multiplicity and harmonic relation of the periodicities in 1156+295 reconfirms that global p-mode oscillations of the accretion disc are coupled to the jet. The oscillation of the disc is likely driven by Kelvin-Helmholtz instabilities in the inner edge of the accretion disc.
文章类型Article
关键词Methods: Statistical Galaxies: Active Quasars: Individual: 1156+295
WOS标题词Science & Technology ; Physical Sciences
DOI10.1093/mnras/stu1135
关键词[WOS]PHASE DISPERSION MINIMIZATION ; THICK ACCRETION DISCS ; BLACK-HOLE ; NRAO 530 ; OPTICAL OUTBURSTS ; WAVELET TRANSFORM ; TIME-SERIES ; SPACED DATA ; OJ 287 ; JET
收录类别SCI
语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000339927000006
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被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/15770
专题毫米波和亚毫米波技术实验室
作者单位1.Xiangtan Univ, Sch Math & Comp Sci, Xiangtan 411105, Hunan, Peoples R China
2.Guilin Univ Elect Technol, Key Lab Cognit Radio & Informat Proc, Guilin 541004, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
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Wang, Jun-Yi,An, Tao,Baan, Willem A.,et al. Periodic radio variabilities of the blazar 1156+295: harmonic oscillations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,443(1):58-66.
APA Wang, Jun-Yi,An, Tao,Baan, Willem A.,&Lu, Xiang-Long.(2014).Periodic radio variabilities of the blazar 1156+295: harmonic oscillations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,443(1),58-66.
MLA Wang, Jun-Yi,et al."Periodic radio variabilities of the blazar 1156+295: harmonic oscillations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 443.1(2014):58-66.
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