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Discovery of extended VHE gamma-ray emission from the asymmetric pulsar wind nebula in MSH 15-52 with H.E.S.S

Aharonian, F. / G. Akhperjanian, A. / Aye, K.-M. / R. Bazer-Bachi, A. / Beilicke, M. / Benbow, W. / Berge, D. / Berghaus, P. / Bernlöhr, K. / Boisson, C. / Bolz, O. / Borgmeier, C. / Braun, I. / Breitling, F. / M. Brown, A. / Bussons Gordo, J. / M. Chadwick, P. / 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. / A. Hinton, J. / Hofmann, W. / Holleran, M. / Horns, D. / C. De Jager, O. / Jung, I. / Khélifi, B. / Komin, Nu. / Konopelko, A. / J. Latham, I. / Le Gallou, R. / Lemière, A. / Lemoine, M. / Leroy, N. / Lohse, T. / Marcowith, A. / Masterson, C. / J. L. Mccomb, T. / De Naurois, M. / J. Nolan, S. / Noutsos, A. / J. Orford, K. / L. Osborne, J. / Ouchrif, M. / Panter, M. / Pelletier, G. / Pita, S. / Pühlhofer, G. / Punch, M. / C. Raubenheimer, B. / Raue, M. / Raux, J. / M. Rayner, S. / 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. / J. Van Der Walt, D. / Vasileiadis, G. / Venter, C. / Vincent, P. / Visser, B. / J. Völk, H. / J. Wagner, S. / Martineau-Huynh, O. - 2015
The Supernova Remnant MSH 15-52 has been observed in very high energy (VHE) gamma-rays using the H.E.S.S. 4-telescope array located in Namibia. A gamma-ray signal is detected at the 25 sigma level during an exposure of 22.1 hours live time. The image reveals an elliptically shaped emission region around the pulsar PSR B1509-58, with semi-major axis 6' in the NW-SE direction and semi-minor axis 2' approximately. This morphology coincides with the diffuse pulsar wind nebula as observed at X-ray energies by ROSAT. The overall energy spectrum from 280 GeV up to 40 TeV can be fitted by a power law with photon index Gamma = 2.27 +/- 0.03(stat.) +/- 0.20(syst.). The detected emission can be plausibly explained by inverse Compton scattering of accelerated relativistic electrons with soft photons.

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