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dc.contributor.author
Raiteri, C. M.
dc.contributor.author
Villata, M.
dc.contributor.author
Kadler, M.
dc.contributor.author
Ibrahimov, M. A.
dc.contributor.author
Kurtanidze, O. M.
dc.contributor.author
Larionov, V. M.
dc.contributor.author
Tornikosk, I. M.
dc.contributor.author
Boltwood, P.
dc.contributor.author
Lee, C.-U.
dc.contributor.author
Aller, M. F.
dc.contributor.author
Romero, Gustavo Esteban
dc.contributor.author
Aller, H. D.
dc.contributor.author
Araudo, Anabella Teresa
dc.contributor.author
Arkharov, A. A.
dc.contributor.author
Bach, U.
dc.contributor.author
Barnaby, D.
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Berdyugin, A.
dc.contributor.author
Buemi, C. S.
dc.contributor.author
Carini, M. T.
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Carosati, D.
dc.contributor.author
Cellone, Sergio Aldo
dc.contributor.author
Cool, R.
dc.contributor.author
Dolci, M.
dc.contributor.author
Efimova, N. V.
dc.contributor.author
Fuhrmann, L.
dc.contributor.author
Hagen Thorn, V. A.
dc.contributor.author
Holcomb, M.
dc.contributor.author
Ilyin, I.
dc.contributor.author
Impellizzeri, V.
dc.contributor.author
Ivanidze, R. Z.
dc.contributor.author
Kapanadze, B. Z.
dc.contributor.author
Kerp, J.
dc.contributor.author
Konstantinova, T. S.
dc.contributor.author
Kovalev, Y. Y.
dc.contributor.author
Kovalev, Yu. A.
dc.contributor.author
Kraus, A.
dc.contributor.author
Krichbaum, T. P.
dc.contributor.author
Lähteenmäki, A.
dc.contributor.author
Lanteri, L.
dc.contributor.author
Leto, P.
dc.contributor.author
Lindfors, E.
dc.contributor.author
Mattox, J. R.
dc.contributor.author
Napoleone, N.
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Nikolashvili, M. G.
dc.contributor.author
Nilsson, K.
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Ohlert, J.
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Papadakis, I. E.
dc.contributor.author
Pasanen, M.
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Poteet, C.
dc.contributor.author
Pursimo, T.
dc.contributor.author
Ros, E.
dc.contributor.author
Sigua, L. A.
dc.contributor.author
Smith, S.
dc.contributor.author
Takalo, L. O.
dc.contributor.author
Trigilio, C.
dc.contributor.author
Tröller, M.
dc.contributor.author
Umana, G.
dc.contributor.author
Ungerechts, H.
dc.contributor.author
Walters, R.
dc.contributor.author
Witzel, A.
dc.contributor.author
Xilouris, E.
dc.date.available
2017-12-11T17:59:53Z
dc.date.issued
2006-12
dc.identifier.citation
Raiteri, C. M.; Villata, M.; Kadler, M.; Ibrahimov, M. A.; Kurtanidze, O. M.; et al.; Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.; EDP Sciences; Astronomy and Astrophysics; 459; 3; 12-2006; 731-743
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/30161
dc.description.abstract
Aims.A huge multiwavelength campaign targeting the blazar AO 0235+164 was organized by the Whole Earth Blazar Telescope (WEBT) in 2003–2005 to study the variability properties of the source. Methods.Monitoring observations were carried out at cm and mm wavelengths, and in the near-IR and optical bands, while three pointings by the XMM-Newton satellite provided information on the X-ray and UV emission. Results.We present the data acquired during the second observing season, 2004–2005, by 27 radio-to-optical telescopes. The ~2600 data points collected allow us to trace the low-energy behaviour of the source in detail, revealing an increased near-IR and optical activity with respect to the previous season. Increased variability is also found at the higher radio frequencies, down to ~15 GHz, but not at the lower ones. While the X-ray (and optical) light curves obtained during the XMM-Newton pointings reveal no significant short-term variability, the simultaneous intraday radio observations with the 100 m telescope at Effelsberg show flux-density changes at 10.5 GHz, which are more likely due to a combination of intrinsic and extrinsic processes. Conclusions.The radio (and optical) outburst predicted to peak around February–March 2004 on the basis of the previously observed 5–6 yr quasi-periodicity did not occur. The analysis of the optical light curves reveals now a longer characteristic time scale of variability of ~8 yr, which is also present in the radio data. The spectral energy distributions corresponding to the XMM-Newton observations performed during the WEBT campaign are compared with those pertaining to previous pointings of X-ray satellites. Bright, soft X-ray spectra can be described in terms of an extra component, which appears also when the source is faint through a hard UV spectrum and a curvature of the X-ray spectrum. Finally, there might be a correlation between the X-ray and optical bright states with a long time delay of about 5 yr, which would require a geometrical interpretation.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Active Galaxies
dc.subject
Bl Lacertae Objects
dc.subject
Ao 0235+164 (Objeto Bl Lac)
dc.subject
Jets
dc.subject
Quasars
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-10-12T19:43:25Z
dc.journal.volume
459
dc.journal.number
3
dc.journal.pagination
731-743
dc.journal.pais
Francia
dc.journal.ciudad
Paris
dc.description.fil
Fil: Raiteri, C. M.. Osservatorio Astronomico di Torino; Italia
dc.description.fil
Fil: Villata, M.. Osservatorio Astronomico di Torino; Italia
dc.description.fil
Fil: Kadler, M.. Max Planck Institut für Radioastronomie; Alemania
dc.description.fil
Fil: Ibrahimov, M. A.. Academy of Sciences of Uzbekistan; Uzbekistán
dc.description.fil
Fil: Kurtanidze, O. M.. Abastumani Observatory; Georgia
dc.description.fil
Fil: Larionov, V. M.. St.-Petersburg State Univ.; Rusia
dc.description.fil
Fil: Tornikosk, I. M.. Helsinki Univ. of Technology; Finlandia
dc.description.fil
Fil: Boltwood, P.. Stittsville Main St.; Canadá
dc.description.fil
Fil: Lee, C.-U.. Korea Astronomy and Space Science Institute; Corea del Sur
dc.description.fil
Fil: Aller, M. F.. University of Michigan; Estados Unidos
dc.description.fil
Fil: Romero, Gustavo Esteban. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
dc.description.fil
Fil: Aller, H. D.. University of Michigan; Estados Unidos
dc.description.fil
Fil: Araudo, Anabella Teresa. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
dc.description.fil
Fil: Arkharov, A. A.. Pulkovo Observatory; Rusia
dc.description.fil
Fil: Bach, U.. Osservatorio Astronomico di Torino; Italia
dc.description.fil
Fil: Barnaby, D.. Western Kentucky University; Estados Unidos
dc.description.fil
Fil: Berdyugin, A.. Tuorla Observatory; Finlandia
dc.description.fil
Fil: Buemi, C. S.. Osservatorio Astrofisico di Catania; Italia
dc.description.fil
Fil: Carini, M. T.. Western Kentucky Univ; Estados Unidos
dc.description.fil
Fil: Carosati, D.. Armenzano Astronomical Observatory; Italia
dc.description.fil
Fil: Cellone, Sergio Aldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica la Plata; Argentina
dc.description.fil
Fil: Cool, R.. Steward Observatory; Estados Unidos
dc.description.fil
Fil: Dolci, M.. Osservatorio Astronomico di Collurania Teramo; Italia
dc.description.fil
Fil: Efimova, N. V.. Pulkovo Observatory; Rusia
dc.description.fil
Fil: Fuhrmann, L.. Osservatorio Astronomico di Torino; Italia
dc.description.fil
Fil: Hagen Thorn, V. A.. St.-Petersburg State University; Rusia
dc.description.fil
Fil: Holcomb, M.. Western Kentucky University; Estados Unidos
dc.description.fil
Fil: Ilyin, I.. Astrophysikalisches Institut Potsdam; Alemania
dc.description.fil
Fil: Impellizzeri, V.. Max Planck Institut für Radioastronomie; Alemania
dc.description.fil
Fil: Ivanidze, R. Z.. Abastumani Observatory; Georgia
dc.description.fil
Fil: Kapanadze, B. Z.. Abastumani Observatory; Georgia
dc.description.fil
Fil: Kerp, J.. Universitaet Bonn; Alemania
dc.description.fil
Fil: Konstantinova, T. S.. St.-Petersburg State University; Rusia
dc.description.fil
Fil: Kovalev, Y. Y.. National Radio Astronomy Observatory; Estados Unidos
dc.description.fil
Fil: Kovalev, Yu. A.. Astro Space Center of Lebedev Physical Institute; Estados Unidos
dc.description.fil
Fil: Kraus, A.. Max Planck Institut für Radioastronomie; Alemania
dc.description.fil
Fil: Krichbaum, T. P.. Max Planck Institut für Radioastronomie; Alemania
dc.description.fil
Fil: Lähteenmäki, A.. Helsinki Univ. of Technology; Finlandia
dc.description.fil
Fil: Lanteri, L.. Osservatorio Astronomico di Torino; Italia
dc.description.fil
Fil: Leto, P.. Istituto di Radioastronomia; Italia
dc.description.fil
Fil: Lindfors, E.. Tuorla Observatory; Finlandia
dc.description.fil
Fil: Mattox, J. R.. Fayetteville State University; Estados Unidos
dc.description.fil
Fil: Napoleone, N.. Osservatorio Astronomico di Roma; Italia
dc.description.fil
Fil: Nikolashvili, M. G.. Abastumani Observatory; Georgia
dc.description.fil
Fil: Nilsson, K.. Tuorla Observatory; Finlandia
dc.description.fil
Fil: Ohlert, J.. Michael Adrian Observatory; Alemania
dc.description.fil
Fil: Papadakis, I. E.. University of Crete; Grecia
dc.description.fil
Fil: Pasanen, M.. Tuorla Observatory; Finlandia
dc.description.fil
Fil: Poteet, C.. Western Kentucky University; Estados Unidos
dc.description.fil
Fil: Pursimo, T.. Nordic Optical Telescope; España
dc.description.fil
Fil: Ros, E.. Max Planck Institut für Radioastronomie; Alemania
dc.description.fil
Fil: Sigua, L. A.. Akhaltsikhe branch of the Tbilisi State University; Georgia
dc.description.fil
Fil: Smith, S.. Western Kentucky University; Estados Unidos
dc.description.fil
Fil: Takalo, L. O.. Tuorla Observatory; Finlandia
dc.description.fil
Fil: Trigilio, C.. Osservatorio Astrofisico di Catania; Italia
dc.description.fil
Fil: Tröller, M.. Helsinki University of Technology; Finlandia
dc.description.fil
Fil: Umana, G.. Osservatorio Astrofisico di Catania; Italia
dc.description.fil
Fil: Ungerechts, H.. Instituto de Radio Astronomía Milimétrica ; España
dc.description.fil
Fil: Walters, R.. Western Kentucky University; Estados Unidos
dc.description.fil
Fil: Witzel, A.. Max Planck Institut für Radioastronomie; Alemania
dc.description.fil
Fil: Xilouris, E.. National Observatory of Athens; Grecia
dc.journal.title
Astronomy and Astrophysics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361:20065744
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2006/45/aa5744-06/aa5744-06.html


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