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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents



  history
ID: 292018.0, MPI für Kernphysik / High-Energy Astrophysics
Energy dependent gamma-ray morphology in the Pulsar wind nebula HESS J1825-137
Authors:Aharonian, Felix; Akhperjanian, A. G.; Bazer-Bachi, A. R.; Beilicke, M.; Benbow, Wystan; Berge, David; Bernlöhr, K.; Boisson, C.; Bolz, Oliver; Borrel, V.; Braun, Isabel; Brown, A. M.; Bühler, Rolf; Büsching, I.; Carrigan, Svenja; Chadwick, P. M.; Chounet, L.-M.; Cornils, R.; Costamante, L.; Degrange, B.; Djannati-Atai, A.; Drury, L.O'C.; Emmanoulopoulos, D.; Espigat, P.; Feinstein, F.; Ferrero, E.; Fontaine, G.; Funk, S.; Gallant, Y. A.; Giebels, B.; Glicenstein, J. F.; Goret, P.; Hadjichristidis, C.; Hauser, Dominik; Hauser, M.; Heinzelmann, G.; Henri, G.; Hermann, G.; Hinton, J. A.; Hofmann, W.; Holleran, M.; Horns, D.; de Jager, O. C.; Khélifi, B.; Komin, N.; Konopelko, A.; Latham, I. J.; Le Gallou, R.; Lemière, A.; Lemoine-Goumard, M.; Lohse, T.; Martineau-Huynh, O.; Marcowith, A.; Masterson, C.; McComb, T. J. L.; de Naurois, M.; Nedbal, Dalibor; Nolan, S. J.; Noutsos, A.; Orford, K. J.; Osborne, J. L.; Ouchrif, M.; Panter, Michael; 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, Gavin; Sahakian, V.; Saugé, L.; Schlenker, S.; Schlickeiser, R.; Schröder, R.; Schwanke, U.; Sol, H.; Spangler, D.; Steenkamp, R.; Stegmann, C.; Tavernet, J.-P-; Terrier, R.; Tluczykont, M.; Vasileiadis, G.; Venter, C.; Vincent, P.; Völk, H. J.; Wagner, S. J.; Ward, M.; Bolz, O.; Dickinson, H. J.; Dubus, G.; Egberts, Kathrin; Fiasson, A.; Funk, S.; Jacholkowska, A.; Kosack, K.; Martin, J. M.; Spanier, F.; Superina, G.; van Eldik, C.; Funk, Seb.
Language:English
Corporate body:F. Aharonian et al. for the H.E.S.S. Collaboration
Research Context:H.E.S.S.
Date of Publication (YYYY-MM-DD):2006-06
Title of Journal:Astronomy & Astrophysics
Volume:460
Start Page:365
End Page:374
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Detailed morphological and spatially resolved spectral studies reveal the very high-energy (VHE) gamma-ray aspects of this object with unprecedented precision. We confirm previous results obtained in a survey of the Galactic Plane in 2004. The gamma-ray emission extends asymmetrically to the south and south-west of the energetic pulsar PSR J1826-1334, that is thought to power the pulsar wind nebula. The differential gamma-ray spectrum of the whole emission region is measured over more than two orders of magnitude, from 270 GeV to 35 TeV, and shows indications for a deviation from a pure power law. Spectra have also been determined for spatially separated regions of HESS J1825-137. The photon indices from a power-law fit in the different regions show a softening of the spectrum with increasing distance from the pulsar and therefore an energy dependent morphology. This is the first time that an energy dependent morphology has been detected in the VHE gamma-ray regime. The VHE gamma-ray emission of HESS J1825-137 is phenomenologically discussed in the scenario where the gamma-rays are produced by VHE electrons via Inverse Compton scattering. The high gamma-ray luminosity of the source cannot be explained on the basis of constant spin-down power of the pulsar and requires higher injection power in past.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of W. Hofmann/High Energy Astrophysics (F. Aharonian)
MPI für Kernphysik/Group of W. Hofmann/Experimental High-Energy Astrophysics (M. Panter, G. Hermann)
External Affiliations:Yerevan Physics Institute, 2 Alikhanian Brothers St., 375036 Yerevan, Armenia
Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, 9 Av. du Colonel Roche, BP 4346, 31029 Toulouse Cedex 4, France
Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany
Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France
University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK
Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa
Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France
European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG
APC, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
Landessternwarte, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany
Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, CC 70, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
DAPNIA/DSM/CEA, CE Saclay, 91191 Gif-sur-Yvette, Cedex, France
Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 5, France
Institute of Particle and Nuclear Physics, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic
Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
University of Namibia, Private Bag 13301, Windhoek, Namibia
Identifiers:URL:http://xxx.lanl.gov/abs/astro-ph/0607548
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