Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.

Autores
Raiteri, C. M.; Villata, M.; Kadler, M.; Ibrahimov, M. A.; Kurtanidze, O. M.; Larionov, V. M.; Tornikosk, I. M.; Boltwood, P.; Lee, C.-U.; Aller, M. F.; Romero, Gustavo Esteban; Aller, H. D.; Araudo, Anabella Teresa; Arkharov, A. A.; Bach, U.; Barnaby, D.; Berdyugin, A.; Buemi, C. S.; Carini, M. T.; Carosati, D.; Cellone, Sergio Aldo; Cool, R.; Dolci, M.; Efimova, N. V.; Fuhrmann, L.; Hagen Thorn, V. A.; Holcomb, M.; Ilyin, I.; Impellizzeri, V.; Ivanidze, R. Z.; Kapanadze, B. Z.; Kerp, J.; Konstantinova, T. S.; Kovalev, Y. Y.; Kovalev, Yu. A.; Kraus, A.; Krichbaum, T. P.; Lähteenmäki, A.; Lanteri, L.; Leto, P.; Lindfors, E.; Mattox, J. R.; Napoleone, N.; Nikolashvili, M. G.; Nilsson, K.; Ohlert, J.; Papadakis, I. E.; Pasanen, M.; Poteet, C.; Pursimo, T.; Ros, E.; Sigua, L. A.; Smith, S.; Takalo, L. O.; Trigilio, C.; Tröller, M.; Umana, G.; Ungerechts, H.; Walters, R.; Witzel, A.; Xilouris, E.
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
Fil: Raiteri, C. M.. Osservatorio Astronomico di Torino; Italia
Fil: Villata, M.. Osservatorio Astronomico di Torino; Italia
Fil: Kadler, M.. Max Planck Institut für Radioastronomie; Alemania
Fil: Ibrahimov, M. A.. Academy of Sciences of Uzbekistan; Uzbekistán
Fil: Kurtanidze, O. M.. Abastumani Observatory; Georgia
Fil: Larionov, V. M.. St.-Petersburg State Univ.; Rusia
Fil: Tornikosk, I. M.. Helsinki Univ. of Technology; Finlandia
Fil: Boltwood, P.. Stittsville Main St.; Canadá
Fil: Lee, C.-U.. Korea Astronomy and Space Science Institute; Corea del Sur
Fil: Aller, M. F.. University of Michigan; Estados Unidos
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
Fil: Aller, H. D.. University of Michigan; Estados Unidos
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
Fil: Arkharov, A. A.. Pulkovo Observatory; Rusia
Fil: Bach, U.. Osservatorio Astronomico di Torino; Italia
Fil: Barnaby, D.. Western Kentucky University; Estados Unidos
Fil: Berdyugin, A.. Tuorla Observatory; Finlandia
Fil: Buemi, C. S.. Osservatorio Astrofisico di Catania; Italia
Fil: Carini, M. T.. Western Kentucky Univ; Estados Unidos
Fil: Carosati, D.. Armenzano Astronomical Observatory; Italia
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
Fil: Cool, R.. Steward Observatory; Estados Unidos
Fil: Dolci, M.. Osservatorio Astronomico di Collurania Teramo; Italia
Fil: Efimova, N. V.. Pulkovo Observatory; Rusia
Fil: Fuhrmann, L.. Osservatorio Astronomico di Torino; Italia
Fil: Hagen Thorn, V. A.. St.-Petersburg State University; Rusia
Fil: Holcomb, M.. Western Kentucky University; Estados Unidos
Fil: Ilyin, I.. Astrophysikalisches Institut Potsdam; Alemania
Fil: Impellizzeri, V.. Max Planck Institut für Radioastronomie; Alemania
Fil: Ivanidze, R. Z.. Abastumani Observatory; Georgia
Fil: Kapanadze, B. Z.. Abastumani Observatory; Georgia
Fil: Kerp, J.. Universitaet Bonn; Alemania
Fil: Konstantinova, T. S.. St.-Petersburg State University; Rusia
Fil: Kovalev, Y. Y.. National Radio Astronomy Observatory; Estados Unidos
Fil: Kovalev, Yu. A.. Astro Space Center of Lebedev Physical Institute; Estados Unidos
Fil: Kraus, A.. Max Planck Institut für Radioastronomie; Alemania
Fil: Krichbaum, T. P.. Max Planck Institut für Radioastronomie; Alemania
Fil: Lähteenmäki, A.. Helsinki Univ. of Technology; Finlandia
Fil: Lanteri, L.. Osservatorio Astronomico di Torino; Italia
Fil: Leto, P.. Istituto di Radioastronomia; Italia
Fil: Lindfors, E.. Tuorla Observatory; Finlandia
Fil: Mattox, J. R.. Fayetteville State University; Estados Unidos
Fil: Napoleone, N.. Osservatorio Astronomico di Roma; Italia
Fil: Nikolashvili, M. G.. Abastumani Observatory; Georgia
Fil: Nilsson, K.. Tuorla Observatory; Finlandia
Fil: Ohlert, J.. Michael Adrian Observatory; Alemania
Fil: Papadakis, I. E.. University of Crete; Grecia
Fil: Pasanen, M.. Tuorla Observatory; Finlandia
Fil: Poteet, C.. Western Kentucky University; Estados Unidos
Fil: Pursimo, T.. Nordic Optical Telescope; España
Fil: Ros, E.. Max Planck Institut für Radioastronomie; Alemania
Fil: Sigua, L. A.. Akhaltsikhe branch of the Tbilisi State University; Georgia
Fil: Smith, S.. Western Kentucky University; Estados Unidos
Fil: Takalo, L. O.. Tuorla Observatory; Finlandia
Fil: Trigilio, C.. Osservatorio Astrofisico di Catania; Italia
Fil: Tröller, M.. Helsinki University of Technology; Finlandia
Fil: Umana, G.. Osservatorio Astrofisico di Catania; Italia
Fil: Ungerechts, H.. Instituto de Radio Astronomía Milimétrica ; España
Fil: Walters, R.. Western Kentucky University; Estados Unidos
Fil: Witzel, A.. Max Planck Institut für Radioastronomie; Alemania
Fil: Xilouris, E.. National Observatory of Athens; Grecia
Materia
Active galaxies
BL Lacertae objects
AO 0235+164 (objeto BL Lac)
Jets
Quasars
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/30161
Acceder
id CONICETDig_48150aa1df88a315339268f335d74fff
oai_identifier_str oai:ri.conicet.gov.ar:11336/30161
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.Raiteri, C. M.Villata, M.Kadler, M.Ibrahimov, M. A.Kurtanidze, O. M.Larionov, V. M.Tornikosk, I. M.Boltwood, P.Lee, C.-U.Aller, M. F.Romero, Gustavo EstebanAller, H. D.Araudo, Anabella TeresaArkharov, A. A.Bach, U.Barnaby, D.Berdyugin, A.Buemi, C. S.Carini, M. T.Carosati, D.Cellone, Sergio AldoCool, R.Dolci, M.Efimova, N. V.Fuhrmann, L.Hagen Thorn, V. A.Holcomb, M.Ilyin, I.Impellizzeri, V.Ivanidze, R. Z.Kapanadze, B. Z.Kerp, J.Konstantinova, T. S.Kovalev, Y. Y.Kovalev, Yu. A.Kraus, A.Krichbaum, T. P.Lähteenmäki, A.Lanteri, L.Leto, P.Lindfors, E.Mattox, J. R.Napoleone, N.Nikolashvili, M. G.Nilsson, K.Ohlert, J.Papadakis, I. E.Pasanen, M.Poteet, C.Pursimo, T.Ros, E.Sigua, L. A.Smith, S.Takalo, L. O.Trigilio, C.Tröller, M.Umana, G.Ungerechts, H.Walters, R.Witzel, A.Xilouris, E.Active galaxiesBL Lacertae objectsAO 0235+164 (objeto BL Lac)JetsQuasarshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Aims.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.Fil: Raiteri, C. M.. Osservatorio Astronomico di Torino; ItaliaFil: Villata, M.. Osservatorio Astronomico di Torino; ItaliaFil: Kadler, M.. Max Planck Institut für Radioastronomie; AlemaniaFil: Ibrahimov, M. A.. Academy of Sciences of Uzbekistan; UzbekistánFil: Kurtanidze, O. M.. Abastumani Observatory; GeorgiaFil: Larionov, V. M.. St.-Petersburg State Univ.; RusiaFil: Tornikosk, I. M.. Helsinki Univ. of Technology; FinlandiaFil: Boltwood, P.. Stittsville Main St.; CanadáFil: Lee, C.-U.. Korea Astronomy and Space Science Institute; Corea del SurFil: Aller, M. F.. University of Michigan; Estados UnidosFil: 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; ArgentinaFil: Aller, H. D.. University of Michigan; Estados UnidosFil: 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; ArgentinaFil: Arkharov, A. A.. Pulkovo Observatory; RusiaFil: Bach, U.. Osservatorio Astronomico di Torino; ItaliaFil: Barnaby, D.. Western Kentucky University; Estados UnidosFil: Berdyugin, A.. Tuorla Observatory; FinlandiaFil: Buemi, C. S.. Osservatorio Astrofisico di Catania; ItaliaFil: Carini, M. T.. Western Kentucky Univ; Estados UnidosFil: Carosati, D.. Armenzano Astronomical Observatory; ItaliaFil: 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; ArgentinaFil: Cool, R.. Steward Observatory; Estados UnidosFil: Dolci, M.. Osservatorio Astronomico di Collurania Teramo; ItaliaFil: Efimova, N. V.. Pulkovo Observatory; RusiaFil: Fuhrmann, L.. Osservatorio Astronomico di Torino; ItaliaFil: Hagen Thorn, V. A.. St.-Petersburg State University; RusiaFil: Holcomb, M.. Western Kentucky University; Estados UnidosFil: Ilyin, I.. Astrophysikalisches Institut Potsdam; AlemaniaFil: Impellizzeri, V.. Max Planck Institut für Radioastronomie; AlemaniaFil: Ivanidze, R. Z.. Abastumani Observatory; GeorgiaFil: Kapanadze, B. Z.. Abastumani Observatory; GeorgiaFil: Kerp, J.. Universitaet Bonn; AlemaniaFil: Konstantinova, T. S.. St.-Petersburg State University; RusiaFil: Kovalev, Y. Y.. National Radio Astronomy Observatory; Estados UnidosFil: Kovalev, Yu. A.. Astro Space Center of Lebedev Physical Institute; Estados UnidosFil: Kraus, A.. Max Planck Institut für Radioastronomie; AlemaniaFil: Krichbaum, T. P.. Max Planck Institut für Radioastronomie; AlemaniaFil: Lähteenmäki, A.. Helsinki Univ. of Technology; FinlandiaFil: Lanteri, L.. Osservatorio Astronomico di Torino; ItaliaFil: Leto, P.. Istituto di Radioastronomia; ItaliaFil: Lindfors, E.. Tuorla Observatory; FinlandiaFil: Mattox, J. R.. Fayetteville State University; Estados UnidosFil: Napoleone, N.. Osservatorio Astronomico di Roma; ItaliaFil: Nikolashvili, M. G.. Abastumani Observatory; GeorgiaFil: Nilsson, K.. Tuorla Observatory; FinlandiaFil: Ohlert, J.. Michael Adrian Observatory; AlemaniaFil: Papadakis, I. E.. University of Crete; GreciaFil: Pasanen, M.. Tuorla Observatory; FinlandiaFil: Poteet, C.. Western Kentucky University; Estados UnidosFil: Pursimo, T.. Nordic Optical Telescope; EspañaFil: Ros, E.. Max Planck Institut für Radioastronomie; AlemaniaFil: Sigua, L. A.. Akhaltsikhe branch of the Tbilisi State University; GeorgiaFil: Smith, S.. Western Kentucky University; Estados UnidosFil: Takalo, L. O.. Tuorla Observatory; FinlandiaFil: Trigilio, C.. Osservatorio Astrofisico di Catania; ItaliaFil: Tröller, M.. Helsinki University of Technology; FinlandiaFil: Umana, G.. Osservatorio Astrofisico di Catania; ItaliaFil: Ungerechts, H.. Instituto de Radio Astronomía Milimétrica ; EspañaFil: Walters, R.. Western Kentucky University; Estados UnidosFil: Witzel, A.. Max Planck Institut für Radioastronomie; AlemaniaFil: Xilouris, E.. National Observatory of Athens; GreciaEDP Sciences2006-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/30161Raiteri, 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; 731-7430004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20065744info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2006/45/aa5744-06/aa5744-06.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:42:05Zoai:ri.conicet.gov.ar:11336/30161instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:42:05.851CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.
title Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.
spellingShingle Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.
Raiteri, C. M.
Active galaxies
BL Lacertae objects
AO 0235+164 (objeto BL Lac)
Jets
Quasars
title_short Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.
title_full Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.
title_fullStr Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.
title_full_unstemmed Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.
title_sort Multifrequency variability of the blazar AO0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis.
dc.creator.none.fl_str_mv Raiteri, C. M.
Villata, M.
Kadler, M.
Ibrahimov, M. A.
Kurtanidze, O. M.
Larionov, V. M.
Tornikosk, I. M.
Boltwood, P.
Lee, C.-U.
Aller, M. F.
Romero, Gustavo Esteban
Aller, H. D.
Araudo, Anabella Teresa
Arkharov, A. A.
Bach, U.
Barnaby, D.
Berdyugin, A.
Buemi, C. S.
Carini, M. T.
Carosati, D.
Cellone, Sergio Aldo
Cool, R.
Dolci, M.
Efimova, N. V.
Fuhrmann, L.
Hagen Thorn, V. A.
Holcomb, M.
Ilyin, I.
Impellizzeri, V.
Ivanidze, R. Z.
Kapanadze, B. Z.
Kerp, J.
Konstantinova, T. S.
Kovalev, Y. Y.
Kovalev, Yu. A.
Kraus, A.
Krichbaum, T. P.
Lähteenmäki, A.
Lanteri, L.
Leto, P.
Lindfors, E.
Mattox, J. R.
Napoleone, N.
Nikolashvili, M. G.
Nilsson, K.
Ohlert, J.
Papadakis, I. E.
Pasanen, M.
Poteet, C.
Pursimo, T.
Ros, E.
Sigua, L. A.
Smith, S.
Takalo, L. O.
Trigilio, C.
Tröller, M.
Umana, G.
Ungerechts, H.
Walters, R.
Witzel, A.
Xilouris, E.
author Raiteri, C. M.
author_facet Raiteri, C. M.
Villata, M.
Kadler, M.
Ibrahimov, M. A.
Kurtanidze, O. M.
Larionov, V. M.
Tornikosk, I. M.
Boltwood, P.
Lee, C.-U.
Aller, M. F.
Romero, Gustavo Esteban
Aller, H. D.
Araudo, Anabella Teresa
Arkharov, A. A.
Bach, U.
Barnaby, D.
Berdyugin, A.
Buemi, C. S.
Carini, M. T.
Carosati, D.
Cellone, Sergio Aldo
Cool, R.
Dolci, M.
Efimova, N. V.
Fuhrmann, L.
Hagen Thorn, V. A.
Holcomb, M.
Ilyin, I.
Impellizzeri, V.
Ivanidze, R. Z.
Kapanadze, B. Z.
Kerp, J.
Konstantinova, T. S.
Kovalev, Y. Y.
Kovalev, Yu. A.
Kraus, A.
Krichbaum, T. P.
Lähteenmäki, A.
Lanteri, L.
Leto, P.
Lindfors, E.
Mattox, J. R.
Napoleone, N.
Nikolashvili, M. G.
Nilsson, K.
Ohlert, J.
Papadakis, I. E.
Pasanen, M.
Poteet, C.
Pursimo, T.
Ros, E.
Sigua, L. A.
Smith, S.
Takalo, L. O.
Trigilio, C.
Tröller, M.
Umana, G.
Ungerechts, H.
Walters, R.
Witzel, A.
Xilouris, E.
author_role author
author2 Villata, M.
Kadler, M.
Ibrahimov, M. A.
Kurtanidze, O. M.
Larionov, V. M.
Tornikosk, I. M.
Boltwood, P.
Lee, C.-U.
Aller, M. F.
Romero, Gustavo Esteban
Aller, H. D.
Araudo, Anabella Teresa
Arkharov, A. A.
Bach, U.
Barnaby, D.
Berdyugin, A.
Buemi, C. S.
Carini, M. T.
Carosati, D.
Cellone, Sergio Aldo
Cool, R.
Dolci, M.
Efimova, N. V.
Fuhrmann, L.
Hagen Thorn, V. A.
Holcomb, M.
Ilyin, I.
Impellizzeri, V.
Ivanidze, R. Z.
Kapanadze, B. Z.
Kerp, J.
Konstantinova, T. S.
Kovalev, Y. Y.
Kovalev, Yu. A.
Kraus, A.
Krichbaum, T. P.
Lähteenmäki, A.
Lanteri, L.
Leto, P.
Lindfors, E.
Mattox, J. R.
Napoleone, N.
Nikolashvili, M. G.
Nilsson, K.
Ohlert, J.
Papadakis, I. E.
Pasanen, M.
Poteet, C.
Pursimo, T.
Ros, E.
Sigua, L. A.
Smith, S.
Takalo, L. O.
Trigilio, C.
Tröller, M.
Umana, G.
Ungerechts, H.
Walters, R.
Witzel, A.
Xilouris, E.
author2_role author
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author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
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author
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author
author
author
author
author
author
author
author
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dc.subject.none.fl_str_mv Active galaxies
BL Lacertae objects
AO 0235+164 (objeto BL Lac)
Jets
Quasars
topic Active galaxies
BL Lacertae objects
AO 0235+164 (objeto BL Lac)
Jets
Quasars
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 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.
Fil: Raiteri, C. M.. Osservatorio Astronomico di Torino; Italia
Fil: Villata, M.. Osservatorio Astronomico di Torino; Italia
Fil: Kadler, M.. Max Planck Institut für Radioastronomie; Alemania
Fil: Ibrahimov, M. A.. Academy of Sciences of Uzbekistan; Uzbekistán
Fil: Kurtanidze, O. M.. Abastumani Observatory; Georgia
Fil: Larionov, V. M.. St.-Petersburg State Univ.; Rusia
Fil: Tornikosk, I. M.. Helsinki Univ. of Technology; Finlandia
Fil: Boltwood, P.. Stittsville Main St.; Canadá
Fil: Lee, C.-U.. Korea Astronomy and Space Science Institute; Corea del Sur
Fil: Aller, M. F.. University of Michigan; Estados Unidos
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
Fil: Aller, H. D.. University of Michigan; Estados Unidos
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
Fil: Arkharov, A. A.. Pulkovo Observatory; Rusia
Fil: Bach, U.. Osservatorio Astronomico di Torino; Italia
Fil: Barnaby, D.. Western Kentucky University; Estados Unidos
Fil: Berdyugin, A.. Tuorla Observatory; Finlandia
Fil: Buemi, C. S.. Osservatorio Astrofisico di Catania; Italia
Fil: Carini, M. T.. Western Kentucky Univ; Estados Unidos
Fil: Carosati, D.. Armenzano Astronomical Observatory; Italia
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
Fil: Cool, R.. Steward Observatory; Estados Unidos
Fil: Dolci, M.. Osservatorio Astronomico di Collurania Teramo; Italia
Fil: Efimova, N. V.. Pulkovo Observatory; Rusia
Fil: Fuhrmann, L.. Osservatorio Astronomico di Torino; Italia
Fil: Hagen Thorn, V. A.. St.-Petersburg State University; Rusia
Fil: Holcomb, M.. Western Kentucky University; Estados Unidos
Fil: Ilyin, I.. Astrophysikalisches Institut Potsdam; Alemania
Fil: Impellizzeri, V.. Max Planck Institut für Radioastronomie; Alemania
Fil: Ivanidze, R. Z.. Abastumani Observatory; Georgia
Fil: Kapanadze, B. Z.. Abastumani Observatory; Georgia
Fil: Kerp, J.. Universitaet Bonn; Alemania
Fil: Konstantinova, T. S.. St.-Petersburg State University; Rusia
Fil: Kovalev, Y. Y.. National Radio Astronomy Observatory; Estados Unidos
Fil: Kovalev, Yu. A.. Astro Space Center of Lebedev Physical Institute; Estados Unidos
Fil: Kraus, A.. Max Planck Institut für Radioastronomie; Alemania
Fil: Krichbaum, T. P.. Max Planck Institut für Radioastronomie; Alemania
Fil: Lähteenmäki, A.. Helsinki Univ. of Technology; Finlandia
Fil: Lanteri, L.. Osservatorio Astronomico di Torino; Italia
Fil: Leto, P.. Istituto di Radioastronomia; Italia
Fil: Lindfors, E.. Tuorla Observatory; Finlandia
Fil: Mattox, J. R.. Fayetteville State University; Estados Unidos
Fil: Napoleone, N.. Osservatorio Astronomico di Roma; Italia
Fil: Nikolashvili, M. G.. Abastumani Observatory; Georgia
Fil: Nilsson, K.. Tuorla Observatory; Finlandia
Fil: Ohlert, J.. Michael Adrian Observatory; Alemania
Fil: Papadakis, I. E.. University of Crete; Grecia
Fil: Pasanen, M.. Tuorla Observatory; Finlandia
Fil: Poteet, C.. Western Kentucky University; Estados Unidos
Fil: Pursimo, T.. Nordic Optical Telescope; España
Fil: Ros, E.. Max Planck Institut für Radioastronomie; Alemania
Fil: Sigua, L. A.. Akhaltsikhe branch of the Tbilisi State University; Georgia
Fil: Smith, S.. Western Kentucky University; Estados Unidos
Fil: Takalo, L. O.. Tuorla Observatory; Finlandia
Fil: Trigilio, C.. Osservatorio Astrofisico di Catania; Italia
Fil: Tröller, M.. Helsinki University of Technology; Finlandia
Fil: Umana, G.. Osservatorio Astrofisico di Catania; Italia
Fil: Ungerechts, H.. Instituto de Radio Astronomía Milimétrica ; España
Fil: Walters, R.. Western Kentucky University; Estados Unidos
Fil: Witzel, A.. Max Planck Institut für Radioastronomie; Alemania
Fil: Xilouris, E.. National Observatory of Athens; Grecia
description 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.
publishDate 2006
dc.date.none.fl_str_mv 2006-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/30161
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
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/30161
identifier_str_mv 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
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20065744
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2006/45/aa5744-06/aa5744-06.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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