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



  history
ID: 292017.0, MPI für Kernphysik / High-Energy Astrophysics
3.9 day orbital modulation in the TeV gamma-ray flux and spectrum from the X-ray binary LS 5039
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:the H.E.S.S. Collaboration
Research Context:H.E.S.S.
Title of Journal:Astronomy & Astrophysics
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:New observations of LS 5039, a High Mass X-ray Binary comprising a massive star and compact object, were carried out with the High Energy Stereoscopic System of Cherenkov Telescopes (H.E.S.S.) in 2005 at very high energy (VHE) gamma-ray energies. These observations reveal that its flux and energy spectrum are modulated with the 3.9 day orbital period of the binary system. This is the first time in gamma-ray astronomy that orbital modulation has been observed, and periodicity clearly established using ground-based gamma-ray detectors. The VHE gamma-ray emission is largely confined to half of the orbit, peaking around the inferior conjunction epoch of the compact object. For this epoch, there is also a hardening of the energy spectrum in the energy range between 0.2 TeV and a few TeV. The flux vs. orbital phase profile provides the first clear indication of gamma-ray absorption via pair production within an astrophysical source, a process which is expected to occur if the gamma-ray production site is situated within ~1 AU of the compact object. Moreover the production region size must be not significantly greater than the binary separation (~0.15 AU). Notably, these constraints are also considerably smaller than the collimated outflows or jets (extending out to ~1000 AU) observed in LS 5039. The spectral hardening could arise from variations with phase in the maximum electron energies, and/or the dominant VHE gamma-ray production mechanism.
External Publication Status:submitted
Document Type:Article
Affiliations:MPI für Kernphysik/Group of H. J. Völk/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/0607192
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