Periodic radio variabilities of the blazar 1156+295: harmonic oscillations

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 毫米波和亚毫米波技术实验室

	Periodic radio variabilities of the blazar 1156+295: harmonic oscillations
	Wang, Jun-Yi 1,2; An, Tao 3,4; Baan, Willem A.3; Lu, Xiang-Long 2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2014-09-01
卷号	443 期号:1 页码:58-66
关键词	methods: statistical galaxies: active quasars: individual: 1156+295
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
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/15760]
专题	紫金山天文台_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
推荐引用方式 GB/T 7714	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.