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The correlated optical and radio variability of BL Lacertae WEBT data analysis 1994-2005
Villata, M; Raiteri, CM; Larionov, VM; Nikolashvili, MG; Aller, MF; Bach, U; Carosati, D; Hroch, F; Ibrahimov, MA; Jorstad, SG; Kovalev, YY; Lahteenmaki, A; Nilsson, K; Terasranta, H; Tosti, G; Aller, HD; Arkharov, AA; Berdyugin, A; Boltwood, P; Buemi, CS; Casas, R; Charlot, P; Coloma, JM; Di Paola, A; Di Rico, G; Kimeridze, GN; Konstantinova, TS; Kopatskaya, EN; Kovalev, YA; Kurtanidze, OM; Lanteri, L; Larionova, EG; Larionova, LV; Le Campion, JF; Leto, P; Lindfors, E; Marscher, AP; Marshall, K; McFarland, JP; McHardy, IM; Miller, HR; Nucciarelli, G; Osterman, MP; Pasanen, M; Pursimo, T; Ros, JA; Sadun, AC; Sigua, LA; Sixtova, L; Takalo, LO; Tornikoski, M; Trigilio, C; Umana, G; Xie GZ(谢光中); Zhang, X; Zhou, SB; Villata, M (reprint author), Osserv Astron Torino, INAF, Turin, Italy.
发表期刊ASTRONOMY & ASTROPHYSICS
2009-07
卷号501期号:2页码:455-460
DOI10.1051/0004-6361/200912065
产权排序第29完成单位
收录类别SCI ; EI
关键词Galaxies: Active Galaxies: Bl Lacertae Objects: General Galaxies: Bl Lacertae Objects: Individual: Bl Lacertae Galaxies: Jets Galaxies: Quasars: General
摘要Context. Since 1997, BL Lacertae has undergone a phase of high optical activity, with the occurrence of several prominent outbursts. Starting from 1999, the Whole Earth Blazar Telescope (WEBT) consortium has organized various multifrequency campaigns on this blazar, collecting tens of thousands of data points. One of the main issues in the study of this huge dataset has been the search for correlations between the optical and radio flux variations, and for possible periodicities in the light curves. The analysis of the data assembled during the first four campaigns (comprising also archival data to cover the period 1968-2003) revealed a fair optical-radio correlation in 1994-2003, with a delay of the hard radio events of similar to 100 days. Moreover, various statistical methods suggested the existence of a radio periodicity of similar to 8 years. Aims. In 2004 the WEBT started a new campaign to extend the dataset to the most recent observing seasons, in order to possibly confirm and better understand the previous results. Methods. In this campaign we have collected and assembled about 11 000 new optical observations from twenty telescopes, plus near-IR and radio data at various frequencies. Here, we perform a correlation analysis on the long-term R-band and radio light curves. Results. In general, we confirm the similar to 100-day delay of the hard radio events with respect to the optical ones, even if longer (similar to 200-300 days) time lags are also found in particular periods. The radio quasi-periodicity is confirmed too, but the "period" seems to progressively lengthen from 7.4 to 9.3 years in the last three cycles. The optical and radio behaviour in the last forty years suggests a scenario where geometric effects play a major role. In particular, the alternation of enhanced and suppressed optical activity (accompanied by hard and soft radio events, respectively) can be explained in terms of an emitting plasma flowing along a rotating helical path in a curved jet.
项目资助者Russian Foundation for Basic Researches [09-02-00092, 01-02-16812, 05-02-17377, 0802-00545] ; National Science Foundation ; University of Michigan ; UK Science and Technology Facilities Council ; Academy of Finland
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6361
URL查看原文
WOS记录号WOS:000268125300007
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]LIGHT CURVES ; SPECTRAL VARIABILITY ; HELICAL JETS ; BLAZARS ; CAMPAIGNS ; OBJECTS ; GHZ
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7044
专题星系研究组
通讯作者Villata, M (reprint author), Osserv Astron Torino, INAF, Turin, Italy.
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Villata, M,Raiteri, CM,Larionov, VM,et al. The correlated optical and radio variability of BL Lacertae WEBT data analysis 1994-2005[J]. ASTRONOMY & ASTROPHYSICS,2009,501(2):455-460.
APA Villata, M.,Raiteri, CM.,Larionov, VM.,Nikolashvili, MG.,Aller, MF.,...&Villata, M .(2009).The correlated optical and radio variability of BL Lacertae WEBT data analysis 1994-2005.ASTRONOMY & ASTROPHYSICS,501(2),455-460.
MLA Villata, M,et al."The correlated optical and radio variability of BL Lacertae WEBT data analysis 1994-2005".ASTRONOMY & ASTROPHYSICS 501.2(2009):455-460.
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