YNAO OpenIR  > 星系研究组
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.
Contribution Rank第29完成单位
Indexed BySCI ; EI
KeywordGalaxies: Active Galaxies: Bl Lacertae Objects: General Galaxies: Bl Lacertae Objects: Individual: Bl Lacertae Galaxies: Jets Galaxies: Quasars: General
AbstractContext. 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.
Funding OrganizationRussian 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
Subject AreaAstronomy & Astrophysics
WOS IDWOS:000268125300007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
Citation statistics
Cited Times:51[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorVillata, M (reprint author), Osserv Astron Torino, INAF, Turin, Italy.
Recommended Citation
GB/T 7714
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.
Files in This Item:
File Name/Size DocType Version Access License
The correlated optic(511KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Villata, M]'s Articles
[Raiteri, CM]'s Articles
[Larionov, VM]'s Articles
Baidu academic
Similar articles in Baidu academic
[Villata, M]'s Articles
[Raiteri, CM]'s Articles
[Larionov, VM]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Villata, M]'s Articles
[Raiteri, CM]'s Articles
[Larionov, VM]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: The correlated optical and radio variability of BL Lacertae.pdf
Format: Adobe PDF
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.