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VHE gamma-ray emiss...
VHE gamma-ray emission of PKS 2155-304 : spectral and temporal variability
- Article/chapterEnglish2010
Publisher, publication year, extent ...
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2010-10-07
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EDP Sciences,2010
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:su-51703
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-51703URI
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https://doi.org/10.1051/0004-6361/201014484DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-30455URI
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https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-30250URI
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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:art swepub-publicationtype
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authorCount :187
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QC 20110224
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Context. Observations of very high-energy.-rays from blazars provide information about acceleration mechanisms occurring in their innermost regions. Studies of variability in these objects lead to a better understanding of the mechanisms in play. Aims. To investigate the spectral and temporal variability of VHE (>100 GeV) gamma-rays of the well-known high-frequency-peaked BL Lac object PKS 2155-304 with the HESS imaging atmospheric Cherenkov telescopes over a wide range of flux states. Methods. Data collected from 2005 to 2007 were analyzed. Spectra were derived on time scales ranging from 3 years to 4 min. Light curve variability was studied through doubling timescales and structure functions and compared with red noise process simulations. Results. The source was found to be in a low state from 2005 to 2007, except for a set of exceptional flares that occurred in July 2006. The quiescent state of the source is characterized by an associated mean flux level of (4.32 +/- 0.09(stat) +/- 0.86(syst)) x 10(-11) cm(-2) s(-1) above 200 GeV, or approximately 15% of the Crab Nebula, and a power-law photon index of Gamma = 3.53 +/- 0.06(stat) +/- 0.10(syst). During the flares of July 2006, doubling timescales of similar to 2 min are found. The spectral index variation is examined over two orders of magnitude in flux, yielding different behavior at low and high fluxes, which is a new phenomenon in VHE gamma-ray emitting blazars. The variability amplitude characterized by the fractional rms F-var is strongly energy-dependent and is proportional to E-0.19 +/- 0.01. The light curve rms correlates with the flux. This is the signature of a multiplicative process that can be accounted for as a red noise with a Fourier index of similar to 2. Conclusions. This unique data set shows evidence of a low-level.-ray emission state from PKS 2155-304 that possibly has a different origin than the outbursts. The discovery of the light curve ognormal behavior might be an indicator of the origin of aperiodic variability in blazars.
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Acero, F.
(author)
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Aharonian, F.
(author)
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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, Yvonne
(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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Bochow, A.
(author)
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Boisson, C.
(author)
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Bolmont, J.
(author)
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Borrel, V.
(author)
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Brucker, J.
(author)
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Brun, F.
(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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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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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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Conrad, JanStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
(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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Eger, P.
(author)
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Espigat, P.
(author)
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Fallon, L.
(author)
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Farnier, C.
(author)
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Fegan, S.
(author)
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Feinstein, F.
(author)
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Fernandes, M. V.
(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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Gerbig, D.
(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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Goering, D.
(author)
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Hampf, 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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Hofverberg, P.
(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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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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Klochkov, 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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Kossakowski, R.
(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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Lu, C. -C
(author)
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Marandon, V.
(author)
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Marcowith, A.
(author)
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Masbou, J.
(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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Mehault, J.
(author)
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Moderski, R.
(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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Nguyen, N.
(author)
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Nicholas, B.
(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
(author)
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Opitz, B.
(author)
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Orford, K. J.
(author)
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Ostrowski, M.
(author)
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Panter, M.
(author)
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Arribas, M. Paz
(author)
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Pedaletti, G.
(author)
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Pelletier, G.
(author)
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Petrucci, P. -O
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Pita, S.
(author)
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Puehlhofer, G.
(author)
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Punch, M.
(author)
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Quirrenbach, A.
(author)
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Raubenheimer, B. C.
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Raue, M.
(author)
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Rayner, S. M.
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Reimer, O.
(author)
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Renaud, M.
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de los Reyes, R.
(author)
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Rieger, F.
(author)
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Ripken, JoachimStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ripken
(author)
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Rob, L.
(author)
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Rosier-Lees, S.
(author)
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Rowell, G.
(author)
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Rudak, B.
(author)
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Rulten, C. B.
(author)
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Ruppel, J.
(author)
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Ryde, FelixKTH,Partikel- och astropartikelfysik(Swepub:kth)u1tlyg6w
(author)
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Sahakian, V.
(author)
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Santangelo, A.
(author)
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Schlickeiser, R.
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Schoeck, F. M.
(author)
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Schoenwald, A.
(author)
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Schwanke, U.
(author)
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Schwarzburg, S.
(author)
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Schwemmer, S.
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Shalchi, A.
(author)
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Sushch, I.
(author)
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Sikora, M.
(author)
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Skilton, J. L.
(author)
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Sol, H.
(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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Stinzing, F.
(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
(author)
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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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Valerius, K.
(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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Viana, A.
(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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Vorobiov, S.
(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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Zechlin, H. -S
(author)
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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, FranceFysikum
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In:Astronomy and Astrophysics: EDP Sciences520, s. A83-0004-63611432-0746
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- By the author/editor
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Abramowski, A.
-
Acero, F.
-
Aharonian, F.
-
Akhperjanian, A. ...
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Anton, G.
-
de Almeida, U. B ...
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show more...
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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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Bochow, A.
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Boisson, C.
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Bolmont, J.
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Borrel, V.
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Brucker, J.
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Brun, F.
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Brun, P.
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Buehler, R.
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Bulik, T.
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Buesching, I.
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Boutelier, T.
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Punch, M.
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Charbonnier, A.
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Chaves, R. C. G.
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Cheesebrough, A.
-
Chounet, L. -M
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Clapson, A. C.
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Coignet, G.
-
Conrad, Jan
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Costamante, L.
-
Dalton, M.
-
Daniel, M. K.
-
Davids, I. D.
-
Degrange, B.
-
Deil, C.
-
Dickinson, H. J.
-
Djannati-Atai, A ...
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Domainko, W.
-
Drury, L. O 'C.
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Dubois, F.
-
Dubus, G.
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Dyks, J.
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Dyrda, M.
-
Egberts, K.
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Eger, P.
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Espigat, P.
-
Fallon, L.
-
Farnier, C.
-
Fegan, S.
-
Feinstein, F.
-
Fernandes, M. V.
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Fiasson, A.
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Foerster, A.
-
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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Gerbig, D.
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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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Goering, D.
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Hampf, D.
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Hauser, M.
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Heinz, S.
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Heinzelmann, G.
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Henri, G.
-
Hermann, G.
-
Hinton, J. A.
-
Hoffmann, A.
-
Hofmann, W.
-
Hofverberg, P.
-
Holleran, M.
-
Hoppe, S.
-
Horns, D.
-
Jacholkowska, A.
-
de Jager, O. C.
-
Jahn, C.
-
Jung, I.
-
Katarzynski, K.
-
Katz, U.
-
Kaufmann, S.
-
Kerschhaggl, M.
-
Khangulyan, D.
-
Khelifi, B.
-
Keogh, D.
-
Klochkov, D.
-
Kluzniak, W.
-
Kneiske, T.
-
Komin, Nu.
-
Kosack, K.
-
Kossakowski, R.
-
Lamanna, G.
-
Lenain, J. -P
-
Lohse, T.
-
Lu, C. -C
-
Marandon, V.
-
Marcowith, A.
-
Masbou, J.
-
Maurin, D.
-
McComb, T. J. L.
-
Medina, M. C.
-
Mehault, J.
-
Moderski, R.
-
Moulin, E.
-
Naumann-Godo, M.
-
de Naurois, M.
-
Nedbal, D.
-
Nekrassov, D.
-
Nguyen, N.
-
Nicholas, B.
-
Niemiec, J.
-
Nolan, S. J.
-
Ohm, S.
-
Olive, J. -F
-
Wilhelmi, E. de ...
-
Opitz, B.
-
Orford, K. J.
-
Ostrowski, M.
-
Panter, M.
-
Arribas, M. Paz
-
Pedaletti, G.
-
Pelletier, G.
-
Petrucci, P. -O
-
Pita, S.
-
Puehlhofer, G.
-
Quirrenbach, A.
-
Raubenheimer, B. ...
-
Raue, M.
-
Rayner, S. M.
-
Reimer, O.
-
Renaud, M.
-
de los Reyes, R.
-
Rieger, F.
-
Ripken, Joachim
-
Rob, L.
-
Rosier-Lees, S.
-
Rowell, G.
-
Rudak, B.
-
Rulten, C. B.
-
Ruppel, J.
-
Ryde, Felix
-
Sahakian, V.
-
Santangelo, A.
-
Schlickeiser, R.
-
Schoeck, F. M.
-
Schoenwald, A.
-
Schwanke, U.
-
Schwarzburg, S.
-
Schwemmer, S.
-
Shalchi, A.
-
Sushch, I.
-
Sikora, M.
-
Skilton, J. L.
-
Sol, H.
-
Stawarz, L.
-
Steenkamp, R.
-
Stegmann, C.
-
Stinzing, F.
-
Superina, G.
-
Szostek, A.
-
Tam, P. H.
-
Tavernet, J. -P
-
Terrier, R.
-
Tibolla, O.
-
Tluczykont, M.
-
Valerius, K.
-
van Eldik, C.
-
Vasileiadis, G.
-
Venter, C.
-
Venter, L.
-
Vialle, J. P.
-
Viana, A.
-
Vincent, P.
-
Vivier, M.
-
Voelk, H. J.
-
Volpe, F.
-
Vorobiov, S.
-
Wagner, S. J.
-
Ward, M.
-
Zdziarski, A. A.
-
Zech, A.
-
Zechlin, H. -S
-
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