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dc.contributor.author
Abramowski, A.
dc.contributor.author
Acero, F.
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Aharonian, F.
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Akhperjanian, A. G.
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Anton, G.
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Medina, Maria Clementina
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Terrier, R.
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luczykont, M.
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Tzioumis, A.
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Valerius, K.
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van Eldik, C.
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Vasileiadis, G.
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Venter, C.
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Venter, L.
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Vialle, J. P
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Viana, A.
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Vincent, P.
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Völk, H. J.
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Wagner, S. J.
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Volpe, F.
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Vorster, M.
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Vorobiov, S.
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Ward, M.
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Wierzcholska, A.
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White, R.
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Zacharias, M.
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Zajczyk, A.
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Zdziarski, A. A.
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Zech, A.
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Zechlin, H. S.
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H.E.S.S. Collaboration
dc.date.available
2017-08-02T19:45:44Z
dc.date.issued
2012-03
dc.identifier.citation
Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Anton, G.; et al.; A multiwavelength view of the flaring state of PKS 2155-304 in 2006; Edp Sciences; Astronomy And Astrophysics; 539; 3-2012; 149-160
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/21770
dc.description.abstract
Context. Multiwavelength (MWL) observations of the blazar PKS 2155-304 during two weeks in July and August 2006, the period when two exceptional flares at very high energies (VHE, E ≳ 100 GeV) occurred, provide a detailed picture of the evolution of its emission. The complete data set from this campaign is presented, including observations in VHE γ-rays (H.E.S.S.), X-rays (RXTE, Chandra, Swift XRT), optical (Swift UVOT, Bronberg, Watcher, ROTSE), and in the radio band (NRT, HartRAO, ATCA). Optical and radio light curves from 2004 to 2008 are compared to the available VHE data from this period, to put the 2006 campaign into the context of the long-term evolution of the source.
Aims: The data set offers a close view of the evolution of the source on different time scales and yields new insights into the properties of the emission process. The predictions of synchrotron self-Compton (SSC) scenarios are compared to the MWL data, with the aim of describing the dominant features in the data down to the hour time scale.
Methods: The spectral variability in the X-ray and VHE bands is explored and correlations between the integral fluxes at different wavelengths are evaluated. SSC modelling is used to interpret the general trends of the varying spectral energy distribution.
Results: The X-ray and VHE γ-ray emission are correlated during the observed high state of the source, but show no direct connection with longer wavelengths. The long-term flux evolution in the optical and radio bands is found to be correlated and shows that the source reaches a high state at long wavelengths after the occurrence of the VHE flares. Spectral hardening is seen in the Swift XRT data.
Conclusions: The nightly averaged high-energy spectra of the non-flaring nights can be reproduced by a stationary one-zone SSC model, with only small variations in the parameters. The spectral and flux evolution in the high-energy band during the night of the second VHE flare is modelled with multi-zone SSC models, which can provide relatively simple interpretations for the hour time-scale evolution of the high-energy emission, even for such a complex data set. For the first time in this type of source, a clear indication is found for a relation between high activity at high energies and a long-term increase in the low frequency fluxes.
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
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Radiation Mechanisms
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Gamma Ray Galaxies
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Bl Lacertae Objects
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Non-Thermal Mechanisms
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Pks 2155-304 (Objeto Bl Lacertae)
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
A multiwavelength view of the flaring state of PKS 2155-304 in 2006
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-05-15T17:05:33Z
dc.journal.volume
539
dc.journal.pagination
149-160
dc.journal.pais
Francia
dc.journal.ciudad
Paris
dc.description.fil
Fil: Abramowski, A.. Universitat Hamburg; Alemania
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Fil: Acero, F.. Universite Montpellier II; Francia
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Fil: Aharonian, F.. Max Planck Institut für Kernphysik; Alemania
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Fil: Akhperjanian, A. G.. National Academy of Sciences of the Republic of Armenia; Armenia
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Fil: Anton, G.. Universität Erlangen Nürnberg; Alemania
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Fil: Medina, Maria Clementina. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomia; Argentina. CEA Saclay; Francia
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Fil: Terrier, R.. Université Paris Diderot - Paris 7; Francia
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Fil: luczykont, M.. Universitat Hamburg; Alemania
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Fil: Tzioumis, A.. Australia Telescope National Facility; Australia
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Fil: Valerius, K.. Universität Erlangen Nürnberg; Alemania
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Fil: van Eldik, C.. Max Planck Institut für Kernphysik; Alemania
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Fil: Vasileiadis, G.. Universite Montpellier II; Francia
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Fil: Venter, C.. North West University; Sudáfrica
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Fil: Venter, L.. Yerevan Physics Institute; Armenia
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Fil: Vialle, J. P. Université de Savoie; Francia
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Fil: Viana, A.. University Of Durham; Reino Unido
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Fil: Vincent, P.. Université Paris Diderot - Paris 7; Francia
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Fil: Völk, H. J.. Max Planck Institut für Kernphysik; Alemania
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Fil: Wagner, S. J.. Universität Heidelberg; Alemania
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Fil: Volpe, F.. Max Planck Institut für Kernphysik; Alemania
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Fil: Vorster, M.. North West University; Sudáfrica
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Fil: Vorobiov, S.. Universite Montpellier II; Francia
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Fil: Ward, M.. University Of Durham; Reino Unido
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Fil: Wierzcholska, A.. Uniwersytet Jagielloński; Polonia
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Fil: White, R.. University of Leicester; Reino Unido
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Fil: Zacharias, M.. Ruhr-universität Bochum; Alemania
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Fil: Zajczyk, A.. Universite Montpellier II; Francia
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Fil: Zdziarski, A. A.. Nicolaus Copernicus Astronomical Center; Polonia
dc.description.fil
Fil: Zech, A.. Université Paris Diderot - Paris 7; Francia
dc.description.fil
Fil: Zechlin, H. S.. Universitat Hamburg; Alemania
dc.description.fil
Fil: H.E.S.S. Collaboration.
dc.journal.title
Astronomy And Astrophysics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2012/03/aa17509-11/aa17509-11.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1051/0004-6361/201117509
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