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Title:
Very high energy gamma rays from the composite SNR G 0.9+0.1
Authors:
Aharonian, F.; Akhperjanian, A. G.; Aye, K.-M.; Bazer-Bachi, A. R.; Beilicke, M.; Benbow, W.; Berge, D.; Berghaus, P.; Bernlöhr, K.; Boisson, C.; Bolz, O.; Borgmeier, C.; Braun, I.; Breitling, F.; Brown, A. M.; Bussons Gordo, J.; Chadwick, P. M.; Chounet, L.-M.; Cornils, R.; Costamante, L.; Degrange, B.; Djannati-Ataï, A.; O'C. Drury, L.; Dubus, G.; Ergin, T.; Espigat, P.; Feinstein, F.; Fleury, P.; Fontaine, G.; Funk, S.; Gallant, Y. A.; Giebels, B.; Gillessen, S.; Goret, P.; Hadjichristidis, C.; Hauser, M.; Heinzelmann, G.; Henri, G.; Hermann, G.; Hinton, J. A.; Hofmann, W.; Holleran, M.; Horns, D.; de Jager, O. C.; Jung, I.; Khélifi, B.; Komin, Nu.; Konopelko, A.; Latham, I. J.; Le Gallou, R.; Lemière, A.; Lemoine, M.; Leroy, N.; Lohse, T.; Marcowith, A.; Masterson, C.; McComb, T. J. L.; de Naurois, M.; 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.; Raux, J.; Rayner, S. M.; Redondo, I.; Reimer, A.; Reimer, O.; Ripken, J.; Rob, L.; Rolland, L.; Rowell, G.; Sahakian, V.; Saugé, L.; Schlenker, S.; Schlickeiser, R.; Schuster, C.; Schwanke, U.; Siewert, M.; Sol, H.; Steenkamp, R.; Stegmann, C.; Tavernet, J.-P.; Terrier, R.; Théoret, C. G.; Tluczykont, M.; Vasileiadis, G.; Venter, C.; Vincent, P.; Visser, B.; Völk, H. J.; Wagner, S. J.
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(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), AD(Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, 9 Av. du Colonel Roche, BP 4346, 31029 Toulouse Cedex 4, France), AE(Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, 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), AH(Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), AI(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany; Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), AJ(LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, 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(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), AN(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), AO(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), AP(Groupe d'Astroparticules de Montpellier, IN2P3/CNRS, Université Montpellier II, CC85, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France), 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(Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), AW(Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland), AX(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), AY(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), AZ(Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), BA(Groupe d'Astroparticules de Montpellier, IN2P3/CNRS, Université Montpellier II, CC85, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France), BB(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), BC(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), BD(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BE(Groupe d'Astroparticules de Montpellier, IN2P3/CNRS, Université Montpellier II, CC85, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France), BF(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), BG(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BH(Service d'Astrophysique, DAPNIA/DSM/CEA, CE Saclay, 91191 Gif-sur-Yvette, France), BI(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), BJ(Landessternwarte, Königstuhl, 69117 Heidelberg, Germany), BK(Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany), BL(Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France), BM(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BN(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BO(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BP(Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa), BQ(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BR(Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa), BS(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany; Landessternwarte, Königstuhl, 69117 Heidelberg, Germany), BT(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), BU(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), BV(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany; Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), BW(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), BX(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), BY(Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), BZ(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), CA(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France), CB(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), CC(Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, 9 Av. du Colonel Roche, BP 4346, 31029 Toulouse Cedex 4, France), CD(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany; European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG), CE(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CF(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75231 Paris Cedex 05, France), CG(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CH(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CI(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CJ(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CK(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75231 Paris Cedex 05, France ; European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG), CL(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), CM(Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France), CN(Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), CO(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany; Landessternwarte, Königstuhl, 69117 Heidelberg, Germany), CP(Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), CQ(Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa), CR(Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany), CS(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75231 Paris Cedex 05, France), CT(University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK), CU(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France ; European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG), CV(Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany), CW(Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany), CX(Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany), CY(Institute of Particle and Nuclear Physics, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic), CZ(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75231 Paris Cedex 05, France), DA(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany ), DB(Yerevan Physics Institute, 2 Alikhanian Brothers St., 375036 Yerevan, Armenia), DC(Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France), DD(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), DE(Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany), DF(Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany), DG(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), DH(Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany), DI(LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France), DJ(University of Namibia, Private Bag 13301, Windhoek, Namibia), DK(Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany), DL(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75231 Paris Cedex 05, France), DM(Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), DN(Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France), DO(Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France ; European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG), DP(Groupe d'Astroparticules de Montpellier, IN2P3/CNRS, Université Montpellier II, CC85, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France), DQ(Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa), DR(Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, 4 place Jussieu, 75231 Paris Cedex 05, France), DS(Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa), DT(Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany), DU(Landessternwarte, Königstuhl, 69117 Heidelberg, Germany)
Publication:
Astronomy and Astrophysics, Volume 432, Issue 2, March III 2005, pp.L25-L29 (A&A Homepage)
Publication Date:
03/2005
Origin:
EDP Sciences
Keywords:
ISM: supernova remnants, ISM: individual objects: G 0.9+0.1, gamma-rays: observations
DOI:
10.1051/0004-6361:200500022
Bibliographic Code:
2005A&A...432L..25A

Abstract

Very high energy (>100 GeV) gamma-ray emission has been detected for the first time from the composite supernova remnant G 0.9+0.1 using the HESS instrument. The source is detected with a significance of ≈13σ, and a photon flux above 200 GeV of (5.7±0.7stat±1.2sys)×10-12 cm-2 s-1, making it one of the weakest sources ever detected at TeV energies. The photon spectrum is compatible with a power law (dN/dE ∝ E) with photon index Γ = 2.40±0.11stat±0.20sys. The gamma-ray emission appears to originate in the plerionic core of the remnant, rather than the shell, and can be plausibly explained as inverse Compton scattering of relativistic electrons.
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