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

Abstract

The Supernova Remnant MSH 15-52 has been observed in very high energy (VHE) $γ$-rays using the HESS 4-telescope array located in Namibia. A $γ$-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 $Γ$=2.27$±$0.03stat$±$ 0.20syst. The detected emission can be plausibly explained by inverse Compton scattering of accelerated relativistic electrons with soft photons.

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A&A
Michael Aye
Michael Aye
Research Scientist in Planetary Science

My research interests include remote sensing of surfaces, related machine learning studies and open source software.

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