Published in
Hans Publishers, Astronomy & Astrophysics, 1(435), p. L17-L20
DOI: 10.1051/0004-6361:200500105
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Tools
Discovery of extended VHE gamma-ray emission from the asymmetric pulsar wind nebula in MSH 15-52 with HESS
,
Ar R. Bazer-Bachi,
A. G. Akhperjanian,
Matthias Beilicke,
Wystan Benbow,
A. R. Bazer-Bachi,
D. Berge,
Patrick Berghaus,
Konrad Bernlohr,
Claire Boisson,
O. Bolz,
K. Bernl�hr
and other authors.
Full text: Download
Abstract
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.