Radio-to-UV monitoring of AO 0235+164 by the WEBT and Swift during the 2006–2007 outburst
C. M. RaiteriINAF, Osservatorio Astronomico di Torino, Italy e-mail: [email protected]M. VillataINAF, Osservatorio Astronomico di Torino, Italy e-mail: [email protected]V. M. LarionovAstron. Inst., St.-Petersburg State Univ., RussiaM. F. AllerDepartment of Astronomy, University of Michigan, MI, USAU. BachMax-Planck-Institut für Radioastronomie, Bonn, GermanyMark GurwellHarvard-Smithsonian Center for Astroph., Cambridge, MA, USAO. M. KurtanidzeAbastumani Astrophysical Observatory, GeorgiaA. LähteenmäkiMetsähovi Radio Obs., Helsinki Univ. of Technology, FinlandK. NilssonTuorla Observatory, Univ. of Turku, Piikkiö, FinlandA. E. VolvachRadio Astron. Lab. of Crimean Astroph. Observatory, UkraineH. D. AllerDepartment of Astronomy, University of Michigan, MI, USAA. A. ArkharovPulkovo Observatory, St. Petersburg, RussiaR. BachevInst. of Astron., Bulgarian Acad. of Sciences, Sofia, BulgariaA. BerdyuginTuorla Observatory, Univ. of Turku, Piikkiö, FinlandM. BöttcherDepartment of Physics and Astronomy, Ohio Univ., OH, USAC. S. BuemiINAF, Osservatorio Astrofisico di Catania, ItalyP. CalcideseOss. Astronomico della Regione Autonoma Valle d'Aosta, ItalyEmanuele CozziA. Di PaolaINAF, Osservatorio Astronomico di Roma, ItalyM. DolciINAF, Osservatorio Astronomico di Collurania Teramo, ItalyJ. H. FanCenter for Astrophysics, Guangzhou University, PR ChinaE. FornéL. FoschiniINAF, IASF-Bologna, ItalyAlok C. GuptaYNAO, Chinese Academy of Sciences, Kunming, PR ChinaV. A. Hagen‐ThornAstron. Inst., St.-Petersburg State Univ., RussiaL. HooksDepartment of Physics and Astronomy, Ohio Univ., OH, USAT. HovattaMetsähovi Radio Obs., Helsinki Univ. of Technology, FinlandM. JoshiDepartment of Physics and Astronomy, Ohio Univ., OH, USAM. KadlerNASA/Goddard Space Flight Center, Greenbelt, Maryland, USAG. N. KimeridzeAbastumani Astrophysical Observatory, GeorgiaT. S. KonstantinovaAstron. Inst., St.-Petersburg State Univ., RussiaA. KostovInst. of Astronomy, BAN, BulgariaT. P. KrichbaumMax-Planck-Institut für Radioastronomie, 53121 Bonn, GermanyL. LanteriINAF, Osservatorio Astronomico di Torino, Italy e-mail: [email protected]L. V. LarionovaAstron. Inst., St.-Petersburg State Univ., RussiaChung‐Uk LeeKorea Astronomy and Space Science Institute, South KoreaP. LetoINAF, Istituto di Radioastronomia, Sezione di Noto, ItalyE. LindforsTuorla Observatory, Univ. of Turku, Piikkiö, FinlandF. MontagniGreve Observatory, ItalyR. NesciDept. of Phys., “La Sapienza” Univ., Roma, ItalyE. NieppolaMetsähovi Radio Obs., Helsinki Univ. of Technology, FinlandM. G. NikolashviliAbastumani Astrophysical Observatory, GeorgiaJ. OhlertA. OksanenHankasalmi Observatory, FinlandE. OvcharovSofia University, BulgariaPertti PääkkönenM. PasanenTuorla Observatory, Univ. of Turku, Piikkiö, FinlandT. PursimoNordic Optical Telescope, Santa Cruz de La Palma, SpainJ. AgramuntE. SemkovInst. of Astron., Bulgarian Acad. of Sciences, Sofia, BulgariaL. A. SiguaAbastumani Astrophysical Observatory, GeorgiaR. L. SmartINAF, Osservatorio Astronomico di Torino, Italy e-mail: [email protected]A. StrigachevInst. of Astron., Bulgarian Acad. of Sciences, Sofia, BulgariaL. O. TakaloTuorla Observatory, Univ. of Turku, Piikkiö, FinlandK. ToriiOsaka University, JapanI. TorniainenMetsähovi Radio Obs., Helsinki Univ. of Technology, FinlandM. TornikoskiMetsähovi Radio Obs., Helsinki Univ. of Technology, FinlandC. TrigilioINAF, Osservatorio Astrofisico di Catania, ItalyH. TsunemiOsaka University, JapanG. UmanaINAF, Osservatorio Astrofisico di Catania, ItalyA. ValchevaInst. of Astron., Bulgarian Acad. of Sciences, Sofia, Bulgaria
2008en
ABI
Аннотация
Context.The blazar AO 0235+164 was claimed to show a quasi-periodic behaviour in the radio and optical bands in the past, with the main outbursts repeating every 5–6 years. However, the predicted 2004 outburst did not occur, and further analysis suggested a longer time scale, according to which the next event would have occurred in the 2006–2007 observing season. Moreover, an extra emission component contributing to the UV and soft X-ray flux was detected, whose nature is not yet clear. An optical outburst was observed in late 2006–early 2007, which triggered a Whole Earth Blazar Telescope (WEBT) campaign as well as target of opportunity (ToO) observations by the Swift satellite.
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