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题名: Periodic radio variabilities of the blazar 1156+295: harmonic oscillations
作者: Wang, Jun-Yi1, 2; An, Tao3, 4; Baan, Willem A.3; Lu, Xiang-Long2
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2014-09-01
卷号: 443, 期号:1, 页码:58-66
关键词: methods: statistical ; galaxies: active ; quasars: individual: 1156+295
DOI: 10.1093/mnras/stu1135
文章类型: Article
英文摘要: (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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
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记录号: WOS:000339927000006
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15760
Appears in Collections:毫米波和亚毫米波技术实验室_期刊论文

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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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