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Simultaneous multiw...
Simultaneous multiwavelength observations of the second exceptional gamma-ray flare of PKS2155-304 in July 2006
- Article/chapterEnglish2009
Publisher, publication year, extent ...
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2009-06-15
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EDP Sciences,2009
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:lnu-30262
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https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-30262URI
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https://doi.org/10.1051/0004-6361/200912128DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:for swepub-publicationtype
Notes
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Aims. The X-ray-TeV connection and the evolution of the emitting particle population is studied in high-energy peaked BL Lac objects, by obtaining spectral information in both bands on sub-hour timescales. Methods. Simultaneous observations with HESS, Chandra and the Bronberg optical observatory were performed on the BL Lac object PKS 2155-304 in the night of July 29-30 2006, when the source underwent a major gamma-ray outburst during its high-activity state of Summer 2006. This event took place about 44 h after the other major outburst of the night of July 27-28, which is known for its ultrafast variability. An unprecedented 6 to 8 h of simultaneous, uninterrupted coverage was achieved, with spectra and light curves measured down to 7 and 2 min timescales, respectively. Results. The source exhibited one major flare along the night, at high energies. The gamma-ray flux reached a maximum of similar to 11 times the Crab flux (>400 GeV), with rise/decay timescales of similar to 1 h, plus a few smaller-amplitude flares superimposed on the decaying phase. The emission in the X-ray and VHE gamma-ray bands is strongly correlated, with no evidence of lags. The spectra also evolve with similar patterns, and are always soft ( photon index G > 2), indicating no strong shift of the peaks in the spectral energy distribution towards higher energies. Only at the flare maximum is there evidence that the gamma-ray peak is inside the observed passband, at similar to 400-600 GeV. The VHE spectrum shows a curvature that is variable with time and stronger at higher fluxes. The huge VHE variations (similar to 22x) are only accompanied by small-amplitude X-ray and optical variations (factor 2 and 15% respectively). The source has shown for the first time in a high-energy peaked BL Lac object a large Compton dominance (L(C)/L(S) similar to 10) - rapidly evolving - and a cubic relation between VHE and X-ray flux variations, during a decaying phase. These results challenge the common scenarios for the TeV-blazar emission.
Subject headings and genre
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Akhperjanian, A. G.
(author)
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Anton, G.
(author)
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de Almeida, U. Barres
(author)
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Bazer-Bachi, A. R.
(author)
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Becherini, YvonneUniv Paris 07, CNRS, UMR 7164, CEA,Observ Paris, F-75205 Paris 13, France(Swepub:lnu)yvbeaa
(author)
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Behera, B.
(author)
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Benbow, W.
(author)
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Bernloehr, K.
(author)
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Boisson, C.
(author)
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Bochow, A.
(author)
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Borrel, V.
(author)
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Brion, E.
(author)
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Brucker, J.
(author)
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Brun, P.
(author)
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Buehler, R.
(author)
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Bulik, T.
(author)
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Buesching, I.
(author)
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Boutelier, T.
(author)
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Chadwick, P. M.
(author)
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Charbonnier, A.
(author)
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Chaves, R. C. G.
(author)
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Cheesebrough, A.
(author)
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Chounet, L. -M
(author)
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Clapson, A. C.
(author)
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Coignet, G.
(author)
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Costamante, L.
(author)
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Dalton, M.
(author)
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Daniel, M. K.
(author)
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Davids, I. D.
(author)
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Degrange, B.
(author)
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Deil, C.
(author)
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Dickinson, H. J.
(author)
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Djannati-Atai, A.
(author)
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Domainko, W.
(author)
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Drury, L. O 'C.
(author)
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Dubois, F.
(author)
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Dubus, G.
(author)
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Dyks, J.
(author)
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Dyrda, M.
(author)
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Egberts, K.
(author)
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Emmanoulopoulos, D.
(author)
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Espigat, P.
(author)
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Farnier, C.
(author)
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Feinstein, F.
(author)
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Fiasson, A.
(author)
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Foerster, A.
(author)
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Fontaine, G.
(author)
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Fuessling, M.
(author)
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Gabici, S.
(author)
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Gallant, Y. A.
(author)
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Gerard, L.
(author)
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Giebels, B.
(author)
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Glicenstein, J. F.
(author)
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Glueck, B.
(author)
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Goret, P.
(author)
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Goehring, D.
(author)
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Hauser, D.
(author)
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Hauser, M.
(author)
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Heinz, S.
(author)
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Heinzelmann, G.
(author)
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Henri, G.
(author)
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Hermann, G.
(author)
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Hinton, J. A.
(author)
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Hoffmann, A.
(author)
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Hofmann, W.
(author)
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Holleran, M.
(author)
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Hoppe, S.
(author)
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Horns, D.
(author)
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Jacholkowska, A.
(author)
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de Jager, O. C.
(author)
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Jahn, C.
(author)
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Jung, I.
(author)
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Katarzynski, K.
(author)
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Katz, U.
(author)
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Kaufmann, S.
(author)
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Kendziorra, E.
(author)
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Kerschhaggl, M.
(author)
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Khangulyan, D.
(author)
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Khelifi, B.
(author)
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Keogh, D.
(author)
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Kluzniak, W.
(author)
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Kneiske, T.
(author)
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Komin, Nu.
(author)
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Kosack, K.
(author)
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Lamanna, G.
(author)
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Lenain, J. -P
(author)
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Lohse, T.
(author)
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Marandon, V.
(author)
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Martin, J. M.
(author)
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Martineau-Huynh, O.
(author)
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Marcowith, A.
(author)
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Maurin, D.
(author)
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McComb, T. J. L.
(author)
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Medina, M. C.
(author)
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Moderski, R.
(author)
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Monard, L. A. G.
(author)
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Moulin, E.
(author)
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Naumann-Godo, M.
(author)
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de Naurois, M.
(author)
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Nedbal, D.
(author)
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Nekrassov, D.
(author)
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Niemiec, J.
(author)
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Nolan, S. J.
(author)
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Ohm, S.
(author)
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Olive, J. -F
(author)
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Wilhelmi, E. de Ona
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Orford, K. J.
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Ostrowski, M.
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Panter, M.
(author)
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Arribas, M. Paz
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Pedaletti, G.
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Pelletier, G.
(author)
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Petrucci, P-O
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Pita, S.
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Puehlhofer, G.
(author)
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Punch, M.Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France(Swepub:lnu)mipuaa
(author)
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Quirrenbach, A.
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Raubenheimer, B. C.
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Raue, M.
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Rayner, S. M.
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Renaud, M.
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Rieger, F.
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Ripken, J.
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Rob, L.
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Rosier-Lees, S.
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Rowell, G.
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Rudak, B.
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Rulten, C. B.
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Ruppel, J.
(author)
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Sahakian, V.
(author)
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Santangelo, A.
(author)
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Schlickeiser, R.
(author)
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Schoeck, F. M.
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Schroeder, R.
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Schwanke, U.
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Schwarzburg, S.
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Schwemmer, S.
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Shalchi, A.
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Sikora, M.
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Skilton, J. L.
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Sol, H.
(author)
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Spangler, D.
(author)
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Stawarz, L.
(author)
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Steenkamp, R.
(author)
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Stegmann, C.
(author)
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Superina, G.
(author)
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Szostek, A.
(author)
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Tam, P. H.
(author)
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Tavernet, J. -P
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Terrier, R.
(author)
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Tibolla, O.
(author)
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Tluczykont, M.
(author)
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Van Eldik, C.
(author)
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Vasileiadis, G.
(author)
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Venter, C.
(author)
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Venter, L.
(author)
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Vialle, J. P.
(author)
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Vincent, P.
(author)
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Vivier, M.
(author)
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Voelk, H. J.
(author)
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Volpe, F.
(author)
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Wagner, S. J.
(author)
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Ward, M.
(author)
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Zdziarski, A. A.
(author)
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Zech, A.
(author)
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Univ Paris 07, CNRS, UMR 7164, CEA,Observ Paris, F-75205 Paris 13, FranceUniv Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France
(creator_code:org_t)
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In:Astronomy and Astrophysics: EDP Sciences502:3, s. 749-7700004-63611432-0746
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Aharonian, F.
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Akhperjanian, A. ...
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de Almeida, U. B ...
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Bazer-Bachi, A. ...
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Becherini, Yvonn ...
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Behera, B.
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Benbow, W.
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Bernloehr, K.
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Boisson, C.
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Bochow, A.
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Borrel, V.
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Brion, E.
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Brucker, J.
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Brun, P.
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Buehler, R.
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Bulik, T.
-
Buesching, I.
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Boutelier, T.
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Chadwick, P. M.
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Charbonnier, A.
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Chaves, R. C. G.
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Cheesebrough, A.
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Chounet, L. -M
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Clapson, A. C.
-
Coignet, G.
-
Costamante, L.
-
Dalton, M.
-
Daniel, M. K.
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Davids, I. D.
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Degrange, B.
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Deil, C.
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Dickinson, H. J.
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Djannati-Atai, A ...
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Domainko, W.
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Drury, L. O 'C.
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Dubus, G.
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Dyks, J.
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Dyrda, M.
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Egberts, K.
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Emmanoulopoulos, ...
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Espigat, P.
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Farnier, C.
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Feinstein, F.
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Fiasson, A.
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Foerster, A.
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Fontaine, G.
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Fuessling, M.
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Gabici, S.
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Gallant, Y. A.
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Gerard, L.
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Giebels, B.
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Glicenstein, J. ...
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Glueck, B.
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Goret, P.
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Goehring, D.
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Hauser, D.
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Hauser, M.
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Heinz, S.
-
Heinzelmann, G.
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Henri, G.
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Hermann, G.
-
Hinton, J. A.
-
Hoffmann, A.
-
Hofmann, W.
-
Holleran, M.
-
Hoppe, S.
-
Horns, D.
-
Jacholkowska, A.
-
de Jager, O. C.
-
Jahn, C.
-
Jung, I.
-
Katarzynski, K.
-
Katz, U.
-
Kaufmann, S.
-
Kendziorra, E.
-
Kerschhaggl, M.
-
Khangulyan, D.
-
Khelifi, B.
-
Keogh, D.
-
Kluzniak, W.
-
Kneiske, T.
-
Komin, Nu.
-
Kosack, K.
-
Lamanna, G.
-
Lenain, J. -P
-
Lohse, T.
-
Marandon, V.
-
Martin, J. M.
-
Martineau-Huynh, ...
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Marcowith, A.
-
Maurin, D.
-
McComb, T. J. L.
-
Medina, M. C.
-
Moderski, R.
-
Monard, L. A. G.
-
Moulin, E.
-
Naumann-Godo, M.
-
de Naurois, M.
-
Nedbal, D.
-
Nekrassov, D.
-
Niemiec, J.
-
Nolan, S. J.
-
Ohm, S.
-
Olive, J. -F
-
Wilhelmi, E. de ...
-
Orford, K. J.
-
Ostrowski, M.
-
Panter, M.
-
Arribas, M. Paz
-
Pedaletti, G.
-
Pelletier, G.
-
Petrucci, P-O
-
Pita, S.
-
Puehlhofer, G.
-
Punch, M.
-
Quirrenbach, A.
-
Raubenheimer, B. ...
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Raue, M.
-
Rayner, S. M.
-
Renaud, M.
-
Rieger, F.
-
Ripken, J.
-
Rob, L.
-
Rosier-Lees, S.
-
Rowell, G.
-
Rudak, B.
-
Rulten, C. B.
-
Ruppel, J.
-
Sahakian, V.
-
Santangelo, A.
-
Schlickeiser, R.
-
Schoeck, F. M.
-
Schroeder, R.
-
Schwanke, U.
-
Schwarzburg, S.
-
Schwemmer, S.
-
Shalchi, A.
-
Sikora, M.
-
Skilton, J. L.
-
Sol, H.
-
Spangler, D.
-
Stawarz, L.
-
Steenkamp, R.
-
Stegmann, C.
-
Superina, G.
-
Szostek, A.
-
Tam, P. H.
-
Tavernet, J. -P
-
Terrier, R.
-
Tibolla, O.
-
Tluczykont, M.
-
Van Eldik, C.
-
Vasileiadis, G.
-
Venter, C.
-
Venter, L.
-
Vialle, J. P.
-
Vincent, P.
-
Vivier, M.
-
Voelk, H. J.
-
Volpe, F.
-
Wagner, S. J.
-
Ward, M.
-
Zdziarski, A. A.
-
Zech, A.
-
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