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VHE gamma-ray emission of PKS 2155-304 : spectral and temporal variability
- Abramowski, A. (author)
- Acero, F. (author)
- Aharonian, F. (author)
- show more...
- Akhperjanian, A. G. (author)
- Anton, G. (author)
- de Almeida, U. Barres (author)
- Bazer-Bachi, A. R. (author)
- Becherini, Yvonne (author)
- Behera, B. (author)
- Benbow, W. (author)
- Bernloehr, K. (author)
- Bochow, A. (author)
- Boisson, C. (author)
- Bolmont, J. (author)
- Borrel, V. (author)
- Brucker, J. (author)
- Brun, F. (author)
- Brun, P. (author)
- Buehler, R. (author)
- Bulik, T. (author)
- Buesching, I. (author)
- Boutelier, T. (author)
- Charbonnier, A. (author)
- Chaves, R. C. G. (author)
- Cheesebrough, A. (author)
- Chounet, L. -M (author)
- Clapson, A. C. (author)
- Coignet, G. (author)
- Costamante, L. (author)
- Dalton, M. (author)
- Daniel, M. K. (author)
- Davids, I. D. (author)
- Degrange, B. (author)
- Deil, C. (author)
- Dickinson, H. J. (author)
- Djannati-Atai, A. (author)
- Domainko, W. (author)
- Drury, L. O 'C. (author)
- Dubois, F. (author)
- Dubus, G. (author)
- Dyks, J. (author)
- Dyrda, M. (author)
- Egberts, K. (author)
- Eger, P. (author)
- Espigat, P. (author)
- Fallon, L. (author)
- Farnier, C. (author)
- Fegan, S. (author)
- Feinstein, F. (author)
- Fernandes, M. V. (author)
- Fiasson, A. (author)
- Foerster, A. (author)
- Fontaine, G. (author)
- Fuessling, M. (author)
- Gabici, S. (author)
- Gallant, Y. A. (author)
- Gerard, L. (author)
- Gerbig, D. (author)
- Giebels, B. (author)
- Glicenstein, J. F. (author)
- Glueck, B. (author)
- Goret, P. (author)
- Goering, D. (author)
- Hampf, D. (author)
- Hauser, M. (author)
- Heinz, S. (author)
- Heinzelmann, G. (author)
- Henri, G. (author)
- Hermann, G. (author)
- Hinton, J. A. (author)
- Hoffmann, A. (author)
- Hofmann, W. (author)
- Hofverberg, P. (author)
- Holleran, M. (author)
- Hoppe, S. (author)
- Horns, D. (author)
- Jacholkowska, A. (author)
- de Jager, O. C. (author)
- Jahn, C. (author)
- Jung, I. (author)
- Katarzynski, K. (author)
- Katz, U. (author)
- Kaufmann, S. (author)
- Kerschhaggl, M. (author)
- Khangulyan, D. (author)
- Khelifi, B. (author)
- Keogh, D. (author)
- Klochkov, D. (author)
- Kluzniak, W. (author)
- Kneiske, T. (author)
- Komin, Nu. (author)
- Kosack, K. (author)
- Kossakowski, R. (author)
- Lamanna, G. (author)
- Lenain, J. -P (author)
- Lohse, T. (author)
- Lu, C. -C (author)
- Marandon, V. (author)
- Marcowith, A. (author)
- Masbou, J. (author)
- Maurin, D. (author)
- McComb, T. J. L. (author)
- Medina, M. C. (author)
- Mehault, J. (author)
- Moderski, R. (author)
- Moulin, E. (author)
- Naumann-Godo, M. (author)
- de Naurois, M. (author)
- Nedbal, D. (author)
- Nekrassov, D. (author)
- Nguyen, N. (author)
- Nicholas, B. (author)
- Niemiec, J. (author)
- Nolan, S. J. (author)
- Ohm, S. (author)
- Olive, J. -F (author)
- Wilhelmi, E. de Ona (author)
- Opitz, B. (author)
- Orford, K. J. (author)
- Ostrowski, M. (author)
- Panter, M. (author)
- Arribas, M. Paz (author)
- Pedaletti, G. (author)
- Pelletier, G. (author)
- Petrucci, P. -O (author)
- Pita, S. (author)
- Puehlhofer, G. (author)
- Punch, M. (author)
- Quirrenbach, A. (author)
- Raubenheimer, B. C. (author)
- Raue, M. (author)
- Rayner, S. M. (author)
- Reimer, O. (author)
- Renaud, M. (author)
- de los Reyes, R. (author)
- Rieger, F. (author)
- Rob, L. (author)
- Rosier-Lees, S. (author)
- Rowell, G. (author)
- Rudak, B. (author)
- Rulten, C. B. (author)
- Ruppel, J. (author)
- Sahakian, V. (author)
- Santangelo, A. (author)
- Schlickeiser, R. (author)
- Schoeck, F. M. (author)
- Schoenwald, A. (author)
- Schwanke, U. (author)
- Schwarzburg, S. (author)
- Schwemmer, S. (author)
- Shalchi, A. (author)
- Sushch, I. (author)
- Sikora, M. (author)
- Skilton, J. L. (author)
- Sol, H. (author)
- Stawarz, L. (author)
- Steenkamp, R. (author)
- Stegmann, C. (author)
- Stinzing, F. (author)
- Superina, G. (author)
- Szostek, A. (author)
- Tam, P. H. (author)
- Tavernet, J. -P (author)
- Terrier, R. (author)
- Tibolla, O. (author)
- Tluczykont, M. (author)
- Valerius, K. (author)
- van Eldik, C. (author)
- Vasileiadis, G. (author)
- Venter, C. (author)
- Venter, L. (author)
- Vialle, J. P. (author)
- Viana, A. (author)
- Vincent, P. (author)
- Vivier, M. (author)
- Voelk, H. J. (author)
- Volpe, F. (author)
- Vorobiov, S. (author)
- Wagner, S. J. (author)
- Ward, M. (author)
- Zdziarski, A. A. (author)
- Zech, A. (author)
- Zechlin, H. -S (author)
- show less...
- (creator_code:org_t)
- 2010-10-07
- 2010
- English.
- In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 520, s. A83-
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- gamma rays: general
- galaxies: active
- galaxies: jets
- BL Lacertae objects: individual: PKS 2155-304
- NATURAL SCIENCES
- NATURVETENSKAP
- Astronomy and astrophysics
- Astropartikelfysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Abramowski, A.
- Acero, F.
- Aharonian, F.
- Akhperjanian, A. ...
- Anton, G.
- de Almeida, U. B ...
- show more...
- Bazer-Bachi, A. ...
- Becherini, Yvonn ...
- Behera, B.
- Benbow, W.
- Bernloehr, K.
- Bochow, A.
- Boisson, C.
- Bolmont, J.
- Borrel, V.
- Brucker, J.
- Brun, F.
- Brun, P.
- Buehler, R.
- Bulik, T.
- Buesching, I.
- Boutelier, T.
- Punch, M.
- Charbonnier, A.
- Chaves, R. C. G.
- Cheesebrough, A.
- Chounet, L. -M
- Clapson, A. C.
- Coignet, G.
- Conrad, Jan
- Costamante, L.
- Dalton, M.
- Daniel, M. K.
- Davids, I. D.
- Degrange, B.
- Deil, C.
- Dickinson, H. J.
- Djannati-Atai, A ...
- Domainko, W.
- Drury, L. O 'C.
- Dubois, F.
- Dubus, G.
- Dyks, J.
- Dyrda, M.
- Egberts, K.
- Eger, P.
- Espigat, P.
- Fallon, L.
- Farnier, C.
- Fegan, S.
- Feinstein, F.
- Fernandes, M. V.
- Fiasson, A.
- Foerster, A.
- Fontaine, G.
- Fuessling, M.
- Gabici, S.
- Gallant, Y. A.
- Gerard, L.
- Gerbig, D.
- Giebels, B.
- Glicenstein, J. ...
- Glueck, B.
- Goret, P.
- Goering, D.
- Hampf, D.
- Hauser, M.
- Heinz, S.
- Heinzelmann, G.
- 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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