(WFRF:(Almeida J)) pers:(Petrucci P. O)
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PKS2005-489 at VHE : four years of monitoring with HESS and simultaneous multi-wavelength observations
- Acero, F. (author)
- Aharonian, F. (author)
- Akhperjanian, A. G. (author)
- show more...
- 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)
- Chadwick, P. M. (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)
- 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)
- 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)
- Marandon, V. (author)
- Martineau-Huynh, O. (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)
- Nicholas, B. (author)
- Niemiec, J. (author)
- Nolan, S. J. (author)
- Ohm, S. (author)
- Olive, J. -F (author)
- Wilhelmi, E. de Ona (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)
- Quirrenbach, A. (author)
- Raubenheimer, B. C. (author)
- Raue, M. (author)
- Rayner, S. M. (author)
- Renaud, M. (author)
- Rieger, F. (author)
- Ripken, J. (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)
- Schwanke, U. (author)
- Schwarzburg, S. (author)
- Schwemmer, S. (author)
- Shalchi, A. (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)
- van Eldik, C. (author)
- Vasileiadis, G. (author)
- Venter, C. (author)
- Venter, L. (author)
- Vialle, J. P. (author)
- Vincent, P. (author)
- Vivier, M. (author)
- Voelk, H. J. (author)
- Volpe, F. (author)
- Wagner, S. J. (author)
- Ward, M. (author)
- Zdziarski, A. A. (author)
- Zech, A. (author)
- show less...
- (creator_code:org_t)
- 2010-03-30
- 2010
- English.
- In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 511, s. A52-
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- Aims. Our aim is to study the very high energy (VHE; E > 100 GeV) gamma-ray emission from BL Lac objects and the evolution in time of their broad-band spectral energy distribution (SED). Methods. VHE observations of the high-frequency peaked BL Lac object PKS 2005-489 were made with the High Energy Stereoscopic System (HESS) from 2004 through 2007. Three simultaneous multi-wavelength campaigns at lower energies were performed during the HESS data taking, consisting of several individual pointings with the XMM-Newton and RXTE satellites. Results. A strong VHE signal, similar to 17 sigma total, from PKS 2005-489 was detected during the four years of HESS observations (90.3 h live time). The integral flux above the average analysis threshold of 400 GeV is similar to 3% of the flux observed from the Crab Nebula and varies weakly on time scales from days to years. The average VHE spectrum measured from similar to 300 GeV to similar to 5 TeV is characterized by a power law with a photon index, Gamma = 3.20 +/- 0.16(stat) +/- 0.10(syst). At X-ray energies the flux is observed to vary by more than an order of magnitude between 2004 and 2005. Strong changes in the X-ray spectrum (Delta Gamma(X) approximate to 0.7) are also observed, which appear to be mirrored in the VHE band. Conclusions. The SED of PKS 2005-489, constructed for the first time with contemporaneous data on both humps, shows significant evolution. The large flux variations in the X-ray band, coupled with weak or no variations in the VHE band and a similar spectral behavior, suggest the emergence of a new, separate, harder emission component in September 2005.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: active
- BL Lacertae objects: individual: PKS 2005-489
- gamma rays: galaxies
- X-rays: individuals: PKS 2005-489
- Astropartikelfysik
- Astroparticle Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Acero, F.
- Aharonian, F.
- Akhperjanian, A. ...
- Anton, G.
- de Almeida, U. B ...
- Bazer-Bachi, A. ...
- show more...
- 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.
- Chadwick, P. M.
- Charbonnier, A.
- Chaves, R. C. G.
- Cheesebrough, A.
- Chounet, L. -M
- Clapson, A. C.
- Coignet, G.
- 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.
- 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.
- 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.
- Marandon, V.
- Martineau-Huynh, ...
- 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.
- Nicholas, B.
- 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. ...
- 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.
- Schwanke, U.
- Schwarzburg, S.
- Schwemmer, S.
- Shalchi, A.
- 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.
- 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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