Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/33048
Titolo: | The radio delay of the exceptional 3C 454.3 outburst. Follow-up WEBT observations in 2005-2006 | Autori: | VILLATA, Massimo RAITERI, Claudia Maria Aller, M. F. Bach, U. Ibrahimov, M. A. Kovalev, Y. Y. Kurtanidze, O. M. Larionov, V. M. Lee, C. -U. LETO, PAOLO Lähteenmäki, A. Nilsson, K. Pursimo, T. Ros, J. A. Sumitomo, N. Volvach, A. Aller, H. D. Arai, A. BUEMI, CARLA SIMONA Coloma, J. M. Doroshenko, V. T. Efimov, Yu. S. Fuhrmann, L. Hagen-Thorn, V. A. Kamada, M. Katsuura, M. Konstantinova, T. Kopatskaya, E. Kotaka, D. Kovalev, Yu. A. Kurosaki, M. LANTERI, Luciano Larionova, L. Mingaliev, M. G. Mizoguchi, S. Nakamura, K. Nikolashvili, M. G. Nishiyama, S. Sadakane, K. Sergeev, S. G. Sigua, L. A. Sillanpää, A. SMART, Richard Laurence Takalo, L. O. Tanaka, K. Tornikoski, M. TRIGILIO, CORRADO UMANA, Grazia Maria Gloria |
Data pubblicazione: | 2007 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 464 | Fascicolo: | 2 | Da pagina:: | L5 | Abstract: | Context: In spring 2005 the blazar <ASTROBJ>3C 454.3</ASTROBJ> was observed in an unprecedented bright state from the near-IR to the hard X-ray frequencies. A mm outburst peaked in June-July 2005, and it was followed by a flux increase at high radio frequencies. <BR />Aims: In this paper we report on multifrequency monitoring by the WEBT aimed at following the further evolution of the outburst in detail. In particular, we investigate the expected correlation and time delays between the optical and radio emissions in order to derive information on the variability mechanisms and jet structure. <BR />Methods: A comparison among the light curves at different frequencies is performed by means of visual inspection and discrete correlation function, and the results are interpreted with a simple model taking into account Doppler factor variations of geometric origin. <BR />Results: The high-frequency radio light curves show a huge outburst starting during the dimming phase of the optical one and lasting more than 1 year. The first phase is characterized by a slow flux increase, while in early 2006 a major flare is observed. The lower-frequency radio light curves show a progressively delayed and fainter event, which disappears below 8 GHz. We suggest that the radio major peak is not physically connected with the spring 2005 optical one, but it is actually correlated with a minor optical flare observed in October-November 2005. This interpretation involves both an intrinsic and a geometric mechanism. The former is represented by disturbances travelling down the emitting jet, the latter being due to the curved-jet motion, with the consequent differential changes of viewing angles of the different emitting regions.For questions regarding the availability of the data presented in this paper, please contact Massimo Villata (villata@oato.inaf.it). | URI: | http://hdl.handle.net/20.500.12386/33048 | URL: | https://www.aanda.org/articles/aa/abs/2007/11/aa6958-06/aa6958-06.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361:20066958 | Bibcode ADS: | 2007A&A...464L...5V | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
aa6958-06.pdf | Pdf editoriale | 1.07 MB | Adobe PDF | Visualizza/apri |
0701299.pdf | arXiv | 1.09 MB | Adobe PDF | Visualizza/apri |
Page view(s)
48
controllato il 31-ago-2024
Download(s)
28
controllato il 31-ago-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.