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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
An exceptional very high energy gamma-ray flare of PKS 2155-304
Astrophysical Journal, Volume 664, No. 2 II, Year 2007
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Description
The high-frequency peaked BL Lac PKS 2155-304 at redshift z = 0.116 is a well-known VHE (>100 GeV) γ-ray emitter. Since 2002 its VHE flux has been monitored using the H.E.S.S. stereoscopic array of imaging atmospheric Cerenkov telescopes in Namibia. During the 2006 July dark period, the average VHE flux was measured to be more than 10 times typical values observed from the object. This article focuses solely on an extreme γ-ray outburst detected in the early hours of 2006 July 28 (MJD 53,944). The average flux observed during this outburst is I(>200 GeV) = (1.72 ± 0.05stat ±0.34syst) × 10-9 cm-2 s -1, corresponding to ∼7 times the flux, I(>200 GeV), observed from the Crab Nebula. Peak fluxes are measured with 1 minute timescale resolution at more than twice this average value. Variability is seen up to ∼600 s in the Fourier power spectrum, and well-resolved bursts varying on timescales of ∼200 s are observed. There are no strong indications for spectral variability within the data. Assuming the emission region has a size comparable to the Schwarzschild radius of a ∼109 M ⊙ black hole, Doppler factors greater than 100 are required to accommodate the observed variability timescales. © 2007. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Aharonian, F. A.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Ireland, Dublin
Institiúid Ard-lénn Bhaile Átha Cliath
Akhperjanian, Ashot G.
Armenia, Yerevan
Yerevan Physics Institute
Bazer-Bachi, A. R.
France, Paris
Cnrs Centre National de la Recherche Scientifique
Behera, Bagmeet
Germany, Heidelberg
Universität Heidelberg
Beilicke, Matthias
Germany, Hamburg
Universität Hamburg
Benbow, Wystan R.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Berge, David
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Switzerland, Geneva
Organisation Européenne Pour la Recherche Nucléaire
Bernlöhr, Konrad
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Germany, Berlin
Humboldt-universität zu Berlin
Boisson, Catherine
France, Paris
Cnrs Centre National de la Recherche Scientifique
Bolz, O.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Borrel, V.
France, Paris
Cnrs Centre National de la Recherche Scientifique
Boutelier, Timothe
France, Paris
Cnrs Centre National de la Recherche Scientifique
Braun, Isabel
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Brion, E.
France, Gif-sur-yvette
Cea Saclay
Brown, Anthony M.
United Kingdom, Durham
Durham University
Buehler, Rolf
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Büsching, Ingo
South Africa, Potchefstroom
North-west University
Bulk, Tomasz
Poland, Warsaw
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Carrigan, Svenja
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Chadwick, Paula M.
United Kingdom, Durham
Durham University
Clapson, André Claude
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Chounet, L. M.
France, Palaiseau
École Polytechnique
Coignet, G. G.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Cornils, R.
Germany, Hamburg
Universität Hamburg
Costamante, Luigi
Germany, Heidelberg
Max-planck-institut Für Kernphysik
France, Paris
Cnrs Centre National de la Recherche Scientifique
Degrange, Bernard
France, Palaiseau
École Polytechnique
Dickinson, Hugh J.
United Kingdom, Durham
Durham University
Djannati-Ataï, Arache
France, Paris
Apc - Astroparticule et Cosmologie
Domainko, Wilfried F.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Drury, Luke O'C
Ireland, Dublin
Institiúid Ard-lénn Bhaile Átha Cliath
Dubus, Guillaume
France, Palaiseau
École Polytechnique
Dyks, Jarosław
Poland, Warsaw
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Egberts, Kathrin
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Emmanoulopoulos, Dimitrios
Germany, Heidelberg
Universität Heidelberg
Espigat, P.
France, Paris
Apc - Astroparticule et Cosmologie
Farnier, Christian
France, Montpellier
Laboratoire Univers et Particules de Montpellier
Feinstein, Fabrice
France, Montpellier
Laboratoire Univers et Particules de Montpellier
Fiasson, Armand
France, Montpellier
Laboratoire Univers et Particules de Montpellier
Förster, Andreas
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Fontaine, Gérard
France, Palaiseau
École Polytechnique
Funk, Seb
Germany, Berlin
Humboldt-universität zu Berlin
Funk, Stefan
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Füssling, Matthias
Germany, Berlin
Humboldt-universität zu Berlin
Gallant, Yves A.
France, Montpellier
Laboratoire Univers et Particules de Montpellier
Giebels, Berrie
France, Palaiseau
École Polytechnique
Glicenstein, Jean François
France, Gif-sur-yvette
Cea Saclay
Glück, B.
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Goret, Philippe
France, Gif-sur-yvette
Cea Saclay
Hadjichristidis, C. N.
United Kingdom, Durham
Durham University
Häuser, D.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Hauser, Marcus
Germany, Heidelberg
Universität Heidelberg
Heinzelmann, Götz
Germany, Hamburg
Universität Hamburg
Henri, Gilles
France, Paris
Cnrs Centre National de la Recherche Scientifique
Hermann, German
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Hinton, James A.J.A.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Germany, Heidelberg
Universität Heidelberg
United Kingdom, Leeds
University of Leeds
Hoffmann, Agnes I.D.
Germany, Tubingen
Eberhard Karls Universität Tübingen
Hofmann, Werner
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Holleran, M.
South Africa, Potchefstroom
North-west University
Hoppe, S.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Horns, Dieter
Germany, Tubingen
Eberhard Karls Universität Tübingen
Jachołkowska, Agnieszka
France, Montpellier
Laboratoire Univers et Particules de Montpellier
de Jager, Ocker C.
South Africa, Potchefstroom
North-west University
Kendziorra, Eckehard
Germany, Tubingen
Eberhard Karls Universität Tübingen
Kerschhaggl, Matthias
Germany, Berlin
Humboldt-universität zu Berlin
Khélifi, Bruno
Germany, Heidelberg
Max-planck-institut Für Kernphysik
France, Palaiseau
École Polytechnique
Komin, Nukri
France, Montpellier
Laboratoire Univers et Particules de Montpellier
Kosack, Karl
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Lamanna, Giovanni
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Latham, Ian J.
United Kingdom, Durham
Durham University
Le Gallou, Roland
United Kingdom, Durham
Durham University
Lemière, Anne
France, Paris
Apc - Astroparticule et Cosmologie
Lemoine-Goumard, Marianne
France, Palaiseau
École Polytechnique
Lenain, Jean Philippe
France, Paris
Cnrs Centre National de la Recherche Scientifique
Lohse, Thomas
Germany, Berlin
Humboldt-universität zu Berlin
Martin, Jean Marc
France, Paris
Cnrs Centre National de la Recherche Scientifique
Martineau-Huynh, Olivier
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Marcowith, Alexandre
France, Montpellier
Laboratoire Univers et Particules de Montpellier
Masterson, Conor
Ireland, Dublin
Institiúid Ard-lénn Bhaile Átha Cliath
Maurin, Guillaume T.
France, Paris
Apc - Astroparticule et Cosmologie
McComb, T. J.Lowry
United Kingdom, Durham
Durham University
Moderski, Rafaƚ
Poland, Warsaw
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Moulin, Emmanuel
France, Gif-sur-yvette
Cea Saclay
France, Montpellier
Laboratoire Univers et Particules de Montpellier
de Naurois, Mathieu
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Nedbal, Dalibor
Czech Republic, Prague
Charles University
Nolan, Sam J.
United Kingdom, Durham
Durham University
Olive, J. P.
France, Paris
Cnrs Centre National de la Recherche Scientifique
Orford, K. J.
United Kingdom, Durham
Durham University
Osborne, J. L.
United Kingdom, Durham
Durham University
Ostrowski, Michałl
Poland, Krakow
Uniwersytet Jagielloński
Panter, M.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Pedaletti, Giovanna
Germany, Heidelberg
Universität Heidelberg
Pelletier, Guy
France, Paris
Cnrs Centre National de la Recherche Scientifique
Petrucci, Pierre Olivier
France, Paris
Cnrs Centre National de la Recherche Scientifique
Pita, Santiago
France, Paris
Apc - Astroparticule et Cosmologie
Pûhlhofer, Gerd
Germany, Heidelberg
Universität Heidelberg
Punch, Michael
France, Paris
Apc - Astroparticule et Cosmologie
Ranchón, S.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Raubenheimer, B. Christo
South Africa, Potchefstroom
North-west University
Raue, Martin
Germany, Hamburg
Universität Hamburg
Rayner, S. M.
United Kingdom, Durham
Durham University
Statistics
Citations: 318
Authors: 100
Affiliations: 23
Identifiers
Doi:
10.1086/520635
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Environmental
Study Locations
Namibia