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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Observations of the Crab nebula with HESS
Astronomy and Astrophysics, Volume 457, No. 3, Year 2006
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Description
Context. The Crab nebula was observed with the HESS stereoscopic Cherenkov-telescope array between October 2003 and January 2005 for a total of 22.9 h (after data quality selection). This period of time partly overlapped with the commissioning phase of the experiment; observations were made with three operational telescopes in late 2003 and with the complete 4 telescope array in January-February 2004 and October 2004-January 2005. Aims. Observations of the Crab nebula are discussed and used as an example to detail the flux and spectral analysis procedures of HESS. The results are used to evaluate the systematic uncertainties in HESS flux measurements. Methods. The Crab nebula data are analysed using standard HESS analysis procedures, which are described in detail. The flux and spectrum of γ-rays from the source are calculated on run-by-run and monthly time-scales, and a correction is applied for long-term variations in the detector sensitivity. Comparisons of the measured flux and spectrum over the observation period, along with the results from a number of different analysis procedures are used to estimate systematic uncertainties in the measurements. Results. The data, taken at a range of zenith angles between 45° and 65°, show a clear signal with over 7500 excess events. The energy spectrum is found to follow a power law with an exponential cutoff, with photon index Γ = 2.39 ± 0.03 stat and cutoff energy E c = (14.3 ± 2.1 stat) TeV between 440 GeV and 40 TeV. The observed integral flux above 1 TeV is (2.26 ± 0.08 stat) × 10 -11 cm -2 s -1. The estimated systematic error on the flux measurement is estimated to be 20%, while the estimated systematic error on the spectral slope is 0.1. © ESO 2006.
Authors & Co-Authors
Aharonian, F. A.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Akhperjanian, Ashot G.
Armenia, Yerevan
Yerevan Physics Institute
Bazer-Bachi, A. R.
France, Toulouse
Université Toulouse Iii - Paul Sabatier
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
Bernlöhr, Konrad
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Germany, Berlin
Humboldt-universität zu Berlin
Boisson, Catherine
France, Meudon
Luth - Laboratoire de L'univers et de Ses Theories
Bolz, O.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Borrel, V.
France, Toulouse
Université Toulouse Iii - Paul Sabatier
Braun, Isabel
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Breitling, Frank
Germany, Berlin
Humboldt-universität zu Berlin
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
Carrigan, Svenja
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Chadwick, Paula M.
United Kingdom, Durham
Durham University
Chounet, L. M.
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
European Associated Laboratory for Gamma-ray Astronomy
Degrange, Bernard
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Dickinson, Hugh J.
United Kingdom, Durham
Durham University
Djannati-Ataï, Arache
France, Paris
L'observatoire de Paris
Drury, Luke O'C
Ireland, Dublin
Institiúid Ard-lénn Bhaile Átha Cliath
Dubus, Guillaume
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Egberts, Kathrin
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Emmanoulopoulos, Dimitrios
Germany, Heidelberg
Universität Heidelberg
Espigat, P.
France, Paris
L'observatoire de Paris
Feinstein, Fabrice
France, Montpellier
Université de Montpellier
Ferrero, E.
Germany, Heidelberg
Universität Heidelberg
Fiasson, Armand
France, Montpellier
Université de Montpellier
Fontaine, Gérard
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Funk, Seb
Germany, Berlin
Humboldt-universität zu Berlin
Funk, Stefan
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Gallant, Yves A.
France, Montpellier
Université de Montpellier
Giebels, Berrie
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Glicenstein, Jean François
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Goret, Philippe
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
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, Saint Martin D'heres
Université Grenoble Alpes
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
Hofmann, Werner
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Holleran, M.
South Africa, Potchefstroom
North-west University
Horns, Dieter
Germany, Tubingen
Eberhard Karls Universität Tübingen
Jachołkowska, Agnieszka
France, Montpellier
Université de Montpellier
de Jager, Ocker C.
South Africa, Potchefstroom
North-west University
Khélifi, Bruno
Germany, Heidelberg
Max-planck-institut Für Kernphysik
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Komin, Nukri
France, Montpellier
Université de Montpellier
Konopelko, Alexander K.
Germany, Berlin
Humboldt-universität zu Berlin
Kosack, Karl
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Latham, Ian J.
United Kingdom, Durham
Durham University
Le Gallou, Roland
United Kingdom, Durham
Durham University
Lemière, Anne
France, Paris
L'observatoire de Paris
Lemoine-Goumard, Marianne
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Lohse, Thomas
Germany, Berlin
Humboldt-universität zu Berlin
Martin, Jean Marc
France, Meudon
Luth - Laboratoire de L'univers et de Ses Theories
Martineau-Huynh, Olivier
France, Paris
Sorbonne Université
Marcowith, Alexandre
France, Toulouse
Université Toulouse Iii - Paul Sabatier
Masterson, C.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
France, Paris
European Associated Laboratory for Gamma-ray Astronomy
McComb, T. J.Lowry
United Kingdom, Durham
Durham University
de Naurois, Mathieu
France, Paris
Sorbonne Université
Nedbal, Dalibor
Czech Republic, Prague
Charles University
Nolan, Sam J.
United Kingdom, Durham
Durham University
Noutsos, Aristeidis
United Kingdom, Durham
Durham University
Orford, K. J.
United Kingdom, Durham
Durham University
Osborne, J. L.
United Kingdom, Durham
Durham University
Ouchrif, M.
France, Paris
Sorbonne Université
France, Paris
European Associated Laboratory for Gamma-ray Astronomy
Panter, M.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Pelletier, Guy
France, Saint Martin D'heres
Université Grenoble Alpes
Pita, Santiago
France, Paris
L'observatoire de Paris
Pûhlhofer, Gerd
Germany, Heidelberg
Universität Heidelberg
Punch, Michael
France, Paris
L'observatoire de Paris
Raubenheimer, B. Christo
South Africa, Potchefstroom
North-west University
Raue, Martin
Germany, Hamburg
Universität Hamburg
Rayner, S. M.
United Kingdom, Durham
Durham University
Reimer, Anita
Germany, Bochum
Ruhr-universitat Bochum
Reimer, Olaf
Germany, Bochum
Ruhr-universitat Bochum
Ripken, Joachim
Germany, Hamburg
Universität Hamburg
Rob, L.
Czech Republic, Prague
Charles University
Rolland, Loïc
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Rowell, Gavin P.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Sahakian, Vardan H.
Armenia, Yerevan
Yerevan Physics Institute
Saugé, Ludovic
France, Saint Martin D'heres
Université Grenoble Alpes
Schlenker, Stefan
Germany, Berlin
Humboldt-universität zu Berlin
Schlickeiser, Reinhard
Germany, Bochum
Ruhr-universitat Bochum
Schwanke, Ullrich
Germany, Berlin
Humboldt-universität zu Berlin
Sol, Hélène
France, Meudon
Luth - Laboratoire de L'univers et de Ses Theories
Spangler, D.
United Kingdom, Durham
Durham University
Spanier, Felix
Germany, Bochum
Ruhr-universitat Bochum
Steenkamp, R.
Namibia, Windhoek
University of Namibia
Stegmann, Christian
Germany, Berlin
Humboldt-universität zu Berlin
Superina, Giulia
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Tavernet, Jean Paul
France, Paris
Sorbonne Université
Terrier, Régis
France, Paris
L'observatoire de Paris
Théoret, C. G.
France, Paris
L'observatoire de Paris
Tluczykont, Martin
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
France, Paris
European Associated Laboratory for Gamma-ray Astronomy
Van Eldik, Christopher
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Vasileiadis, Georges
France, Montpellier
Université de Montpellier
Venter, Christo
South Africa, Potchefstroom
North-west University
Vincent, P.
France, Paris
Sorbonne Université
Völk, Heinrich J.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Wagner, Stefan J.
Germany, Heidelberg
Universität Heidelberg
Ward, Martin J.
United Kingdom, Durham
Durham University
Statistics
Citations: 784
Authors: 107
Affiliations: 21
Identifiers
Doi:
10.1051/0004-6361:20065351
ISSN:
14320746
Study Approach
Quantitative