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http://hdl.handle.net/20.500.12386/31777
Titolo: | The complex variability of blazars: time-scales and periodicity analysis in S4 0954+65 | Autori: | RAITERI, Claudia Maria VILLATA, Massimo Larionov, V M Jorstad, S G Marscher, A P Weaver, Z R Acosta-Pulido, J A Agudo, I Andreeva, T Arkharov, A Bachev, R Benítez, E Berton, M Björklund, I Borman, G A Bozhilov, V CARNERERO MARTIN, Maria Isabel Carosati, D Casadio, C Chen, W P Damljanovic, G D'AMMANDO, FILIPPO Escudero, J Fuentes, A GIROLETTI, MARCELLO Grishina, T S Gupta, A C Hagen-Thorn, V A Hart, M Hiriart, D Hou, W-J Ivanov, D Kim, J-Y Kimeridze, G N Konstantopoulou, C Kopatskaya, E N Kurtanidze, O M Kurtanidze, S O Lähteenmäki, A Larionova, E G Larionova, L V MARCHILI, Nicola Markovic, G Minev, M Morozova, D A Myserlis, I Nakamura, M Nikiforova, A A Nikolashvili, M G Otero-Santos, J Ovcharov, E Pursimo, T Rahimov, I RIGHINI, SIMONA Sakamoto, T Savchenko, S S Semkov, E H Shakhovskoy, D Sigua, L A Stojanovic, M Strigachev, A Thum, C Tornikoski, M Traianou, E Troitskaya, Y V Troitskiy, I S Tsai, A Valcheva, A Vasilyev, A A Vince, O Zaharieva, E |
Data pubblicazione: | 2021 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 504 | Fascicolo: | 4 | Da pagina:: | 5629 | Abstract: | Among active galactic nuclei, blazars show extreme variability properties. We here investigate the case of the BL Lac object S4 0954+65 with data acquired in 2019-2020 by the Transiting Exoplanet Survey Satellite (TESS) and by the Whole Earth Blazar Telescope (WEBT) Collaboration. The 2-min cadence optical light curves provided by TESS during three observing sectors of nearly 1 month each allow us to study the fast variability in great detail. We identify several characteristic short-term time-scales, ranging from a few hours to a few days. However, these are not persistent, as they differ in the various TESS sectors. The long-term photometric and polarimetric optical and radio monitoring undertaken by the WEBT brings significant additional information, revealing that (i) in the optical, long-term flux changes are almost achromatic, while the short-term ones are strongly chromatic; (ii) the radio flux variations at 37 GHz follow those in the optical with a delay of about 3 weeks; (iii) the range of variation of the polarization degree and angle is much larger in the optical than in the radio band, but the mean polarization angles are similar; (iv) the optical long-term variability is characterized by a quasi-periodicity of about 1 month. We explain the source behaviour in terms of a rotating inhomogeneous helical jet, whose pitch angle can change in time. | URI: | http://hdl.handle.net/20.500.12386/31777 | URL: | https://academic.oup.com/mnras/article/504/4/5629/6270904?login=true http://arxiv.org/abs/2104.15005v1 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab1268 | Bibcode ADS: | 2021MNRAS.504.5629R | Fulltext: | open |
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