Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:astro-ph/0607333)
· References in the article
· Citations to the Article (170) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (2)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Observations of the Crab nebula with HESS
Authors:
Aharonian, F.; Akhperjanian, A. G.; Bazer-Bachi, A. R.; Beilicke, M.; Benbow, W.; Berge, D.; Bernlöhr, K.; Boisson, C.; Bolz, O.; Borrel, V.; Braun, I.; Breitling, F.; Brown, A. M.; Bühler, R.; Büsching, I.; Carrigan, S.; Chadwick, P. M.; Chounet, L.-M.; Cornils, R.; Costamante, L.; Degrange, B.; Dickinson, H. J.; Djannati-Ataï, A.; O'C. Drury, L.; Dubus, G.; Egberts, K.; Emmanoulopoulos, D.; Espigat, P.; Feinstein, F.; Ferrero, E.; Fiasson, A.; Fontaine, G.; Funk, Seb.; Funk, S.; Gallant, Y. A.; Giebels, B.; Glicenstein, J. F.; Goret, P.; Hadjichristidis, C.; Hauser, D.; Hauser, M.; Heinzelmann, G.; Henri, G.; Hermann, G.; Hinton, J. A.; Hofmann, W.; Holleran, M.; Horns, D.; Jacholkowska, A.; de Jager, O. C.; Khélifi, B.; Komin, Nu.; Konopelko, A.; Kosack, K.; Latham, I. J.; Le Gallou, R.; Lemière, A.; Lemoine-Goumard, M.; Lohse, T.; Martin, J. M.; Martineau-Huynh, O.; Marcowith, A.; Masterson, C.; McComb, T. J. L.; de Naurois, M.; Nedbal, D.; Nolan, S. J.; Noutsos, A.; Orford, K. J.; Osborne, J. L.; Ouchrif, M.; Panter, M.; Pelletier, G.; Pita, S.; Pühlhofer, G.; Punch, M.; Raubenheimer, B. C.; Raue, M.; Rayner, S. M.; Reimer, A.; Reimer, O.; Ripken, J.; Rob, L.; Rolland, L.; Rowell, G.; Sahakian, V.; Saugé, L.; Schlenker, S.; Schlickeiser, R.; Schwanke, U.; Sol, H.; Spangler, D.; Spanier, F.; Steenkamp, R.; Stegmann, C.; Superina, G.; Tavernet, J.-P.; Terrier, R.; Théoret, C. G.; Tluczykont, M.; van Eldik, C.; Vasileiadis, G.; Venter, C.; Vincent, P.; Völk, H. J.; Wagner, S. J.; Ward, M.
Affiliation:
AA(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany ), AB(Yerevan Physics Institute, 2 Alikhanian Brothers St., 375036 Yerevan, Armenia), AC(Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, 9 Av. du Colonel Roche, BP 4346, 31029 Toulouse Cedex 4, France), AD(Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany), AE(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), AF(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), AG(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany; Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), AH(LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France), AI(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), AJ(Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, 9 Av. du Colonel Roche, BP 4346, 31029 Toulouse Cedex 4, France), AK(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), AL(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), AM(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), AN(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), AO(Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa), AP(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), AQ(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), AR(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), AS(Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany), AT(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany; European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG), AU(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), AV(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), AW(APC, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), AX(Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland), AY(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), AZ(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BA(Landessternwarte, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany), BB(APC, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), BC(Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, CC 70, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France), BD(Landessternwarte, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany), BE(Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, CC 70, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France), BF(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), BG(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), BH(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BI(Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, CC 70, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France), BJ(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), BK(DAPNIA/DSM/CEA, CE Saclay, 91191 Gif-sur-Yvette, Cedex, France), BL(DAPNIA/DSM/CEA, CE Saclay, 91191 Gif-sur-Yvette, Cedex, France), BM(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), BN(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BO(Landessternwarte, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany), BP(Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany), BQ(Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France), BR(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BS(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany; Landessternwarte, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany), BT(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BU(Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa), BV(Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany), BW(Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, CC 70, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France), BX(Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa), BY(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France ; Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BZ(Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, CC 70, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France), CA(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), CB(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), CC(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CD(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CE(APC, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), CF(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), CG(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), CH(LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France), CI(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 5, France), CJ(Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, 9 Av. du Colonel Roche, BP 4346, 31029 Toulouse Cedex 4, France), CK(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany; European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG), CL(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CM(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 5, France), CN(Institute of Particle and Nuclear Physics, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic), CO(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CP(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CQ(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CR(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CS(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 5, France ; European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG), CT(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), CU(Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France), CV(APC, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), CW(Landessternwarte, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany), CX(APC, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), CY(Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa), CZ(Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany), DA(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), DB(Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany), DC(Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany), DD(Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany), DE(Institute of Particle and Nuclear Physics, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic), DF(DAPNIA/DSM/CEA, CE Saclay, 91191 Gif-sur-Yvette, Cedex, France), DG(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), DH(Yerevan Physics Institute, 2 Alikhanian Brothers St., 375036 Yerevan, Armenia), DI(Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France), DJ(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), DK(Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany), DL(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), DM(LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France), DN(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), DO(Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany), DP(University of Namibia, Private Bag 13301, Windhoek, Namibia), DQ(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), DR(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), DS(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 5, France), DT(APC, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), DU(APC, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), DV(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France ; European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG), DW(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), DX(Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, CC 70, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France), DY(Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa), DZ(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 5, France), EA(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), EB(Landessternwarte, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany), EC(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK)
Publication:
Astronomy and Astrophysics, Volume 457, Issue 3, October III 2006, pp.899-915 (A&A Homepage)
Publication Date:
10/2006
Origin:
EDP Sciences
Keywords:
gamma rays: observations, ISM: individual objects: Crab, nebula, ISM: supernova remnants
DOI:
10.1051/0004-6361:20065351
Bibliographic Code:
2006A&A...457..899A

Abstract

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 Ec = (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.

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints