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Very high energy gamma rays from the composite SNR G0.9+0.1

Aharonian, F. / Akhperjanian, A.G. / Aye, K.-M. / Bazer-Bachi, A.R. / Beilicke, M. / Benbow, W. / Berge, D. / Berghaus, P. / Bernlohr, K. / Boisson, C. / Bolz, O. / Borgneier, C. / Bruan, I. / Breitling, F. / Brown, A.M. / Bussons Gordo, J. / Chadwick, P.M. / Chounet, L.-M. / Cornils, R. / Costamante, L. / Degrange, B. / Djannati-Ataï, A. / Drury, L.O'C. / Dubus, G. / Ergin, T. / Espigat, P. / Feinstein, F. / Fleury, P. / Fontaine, G. / Funk, S. / Gallant, Y. / Giebels, B. / Gillessen, S. / Goret, P. / Hadjichristidis, C. / Hauser, M. / Heinzelmann, G. / Henri, G. / Hermann, G. / Hofmann, W. / Holleran, M. / Horns, D. / De Jager, O.C. / Jung, I. / Khelifi, 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. / Pohl, M. / Puhlhofer, 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. / Sauge, 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. / Volk, H.J. / Wagner, S.J. - 2015
Very high energy (> 100 GeV) gamma-ray emission has been detected for the first time from the composite supernova remnant G0.9+0.1 using the H.E.S.S. instrument. The source is detected with a significance of 13 sigma, and a photon flux above 200 GeV of (5.7+/-0.7 stat +/- 1.2 sys) * 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 \propto E^-Gamma) with photon index Gamma = 2.40 +/- 0.11 stat +/- 0.20 sys. 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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