EDP Sciences
Free Access
Volume 435, Number 1, May III 2005
Page(s) L17 - L20
Section Letters
DOI https://doi.org/10.1051/0004-6361:200500105
Published online 25 April 2005

A&A 435, L17-L20 (2005)
DOI: 10.1051/0004-6361:200500105


Discovery of extended VHE gamma-ray emission from the asymmetric pulsar wind nebula in MSH 15-52 with HESS

F. Aharonian1, A. G. Akhperjanian2, K.-M. Aye3, A. R. Bazer-Bachi4, M. Beilicke5, W. Benbow1, D. Berge1, P. Berghaus6, K. Bernlöhr1, 7, C. Boisson8, O. Bolz1, I. Braun1, F. Breitling7, A. M. Brown3, J. Bussons Gordo9, P. M. Chadwick3, L.-M. Chounet10, R. Cornils5, L. Costamante1, 11, B. Degrange10, A. Djannati-Ataï6, L. O'C. Drury12, G. Dubus10, D. Emmanoulopoulos13, P. Espigat6, F. Feinstein9, P. Fleury10, G. Fontaine10, Y. Fuchs14, S. Funk1, Y. A. Gallant9, B. Giebels10, S. Gillessen1, J. F. Glicenstein15, P. Goret15, C. Hadjichristidis3, M. Hauser13, G. Heinzelmann5, G. Henri14, G. Hermann1, J. A. Hinton1, W. Hofmann1, M. Holleran16, D. Horns1, O. C. de Jager16, B. Khélifi1, Nu. Komin7, A. Konopelko1, 7, I. J. Latham3, R. Le Gallou3, A. Lemière6, M. Lemoine-Goumard10, N. Leroy10, T. Lohse7, O. Martineau-Huynh17, A. Marcowith4, C. Masterson1, 11, T. J. L. McComb3, M. de Naurois17, S. J. Nolan3, A. Noutsos3, K. J. Orford3, J. L. Osborne3, M. Ouchrif17, 11, M. Panter1, G. Pelletier14, S. Pita6, G. Pühlhofer1, 13, M. Punch6, B. C. Raubenheimer16, M. Raue5, J. Raux17, S. M. Rayner3, I. Redondo10, 11, A. Reimer18, O. Reimer18, J. Ripken5, L. Rob19, L. Rolland17, G. Rowell1, V. Sahakian2, L. Saugé14, S. Schlenker7, R. Schlickeiser18, C. Schuster18, U. Schwanke7, M. Siewert18, H. Sol8, R. Steenkamp20, C. Stegmann7, J.-P. Tavernet17, R. Terrier6, C. G. Théoret6, M. Tluczykont10, 11, G. Vasileiadis9, C. Venter16, P. Vincent17, H. J. Völk1 and S. J. Wagner13

1  Max-Planck-Institut für Kernphysik, Heidelberg, Germany
    e-mail: Bruno.Khelifi@mpi-hd.mpg.de
2  Yerevan Physics Institute, Armenia
3  University of Durham, Department of Physics, UK
4  Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, Toulouse, France
5  Universität Hamburg, Institut für Experimentalphysik, Germany
6  APC, Paris, France
7  Institut für Physik, Humboldt-Universität zu Berlin, Germany
8  LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, France
9  Groupe d'Astroparticules de Montpellier, IN2P3/CNRS, Université Montpellier II, France
10  Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, Palaiseau, France
11  European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG
12  Dublin Institute for Advanced Studies, Ireland
13  Landessternwarte, Königstuhl, Heidelberg, Germany
14  Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, France
15  DAPNIA/DSM/CEA, CE Saclay, Gif-sur-Yvette, France
16  Unit for Space Physics, North-West University, Potchefstroom, South Africa
17  Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, France
18  Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, Germany
19  Institute of Particle and Nuclear Physics, Charles University, Prague, Czech Republic
20  University of Namibia, Windhoek, Namibia

(Received 2 March 2005 / Accepted 27 March 2005)

The Supernova Remnant MSH 15-52 has been observed in very high energy (VHE) $\gamma$-rays using the HESS 4-telescope array located in Namibia. A $\gamma$-ray signal is detected at the 25 sigma level during an exposure of 22.1 h 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'. 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 $\Gamma=2.27\pm0.03_{\textrm {\scriptsize\,stat}}\pm 0.20_{\textrm{\scriptsize\,syst}}$. The detected emission can be plausibly explained by inverse Compton scattering of accelerated relativistic electrons with soft photons.

Key words: gamma-rays: observations -- ISM: supernova remnants -- pulsar wind nebula -- ISM: individual objects: PSR B1509-58 -- ISM: individual objects: G 320.4-1.2

SIMBAD Objects

© ESO 2005

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.