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Periodic radio variabilities in NRAO 530: a jet-disc connection?
An, Tao1,2; Baan, Willem A.1; Wang, Jun-Yi3,4; Wang, Yu1; Hong, Xiao-Yu1,2; An,T
2013-10-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume434Issue:4Pages:3487-3496
AbstractTime series analysis techniques, Lomb-Scargle periodogram and weighted wavelet Z-transform, have been employed to search for year-time-scale periodicities from the radio light curves of a typical blazar NRAO 530. The periodicity analysis using the two methods show consistent results: two strong and persistent periods of similar to 10 and similar to 6 yr are prominent at all three wavelengths; three other weaker periodicities with shorter time-scales (similar to 5, similar to 3.5 and similar to 3 yr) were also seen; in addition, the 14.5-GHz WWZ power spectrum revealed a similar to 2-yr periodic component during the time interval 1983-1990. Statistical significance analysis suggests that these periodicities might result from physically periodic process. The characteristic frequencies of these periodicities seem to have a harmonic relationship, and the fundamental frequency, i.e. the first-order harmonic, is about 0.05 yr(-1) (P-0 = 20 yr). But the fundamental frequency was not pronounced. The multiplicity and apparent harmonic relationship of the periodicities could be interpreted by the global p-mode oscillation of the accretion disc, if the jet and disc are coupled. In this scenario, the periodic fluctuations in the accretion rate consequently lead to the observed periodic variabilities of the radio luminosity.
KeywordMethods: Statistical Galaxies: Active Quasars: Individual: Nrao 530
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stt1265
WOS KeywordADVECTION-DOMINATED ACCRETION ; UNEVENLY SPACED DATA ; TIME-SERIES ANALYSIS ; BL LACERTAE OBJECTS ; X-RAY BINARIES ; BLAZAR OJ 287 ; BLACK-HOLE ; OPTICAL OUTBURSTS ; GALACTIC NUCLEI ; NEUTRON-STARS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000325262300063
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10104
Collection期刊(老文献)
Corresponding AuthorAn,T
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Guilin Univ Elect Technol, Minist Educ, Key Lab Cognit Radio & Informat Proc, Guilin 541004, Peoples R China
4.Xiangtan Univ, Sch Math & Comp Sci, Xiangtan 411105, Hunan, Peoples R China
Recommended Citation
GB/T 7714
An, Tao,Baan, Willem A.,Wang, Jun-Yi,et al. Periodic radio variabilities in NRAO 530: a jet-disc connection?[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,434(4):3487-3496.
APA An, Tao,Baan, Willem A.,Wang, Jun-Yi,Wang, Yu,Hong, Xiao-Yu,&An,T.(2013).Periodic radio variabilities in NRAO 530: a jet-disc connection?.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,434(4),3487-3496.
MLA An, Tao,et al."Periodic radio variabilities in NRAO 530: a jet-disc connection?".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 434.4(2013):3487-3496.
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