July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

The Fermi-LAT and H.E.S.S. views of the supernova remnant W49B

Aug 5, 2015, 12:00 PM
15m
Yangtze 1 (World Forum)

Yangtze 1

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution GA-EX Parallel GA17 GAL / SNRs

Speaker

Francois Brun (CEA Saclay)

Description

The supernova remnant (SNR) W49B is a mixed-morphology remnant interacting with molecular clouds (MC) which originated in a Type Ib/Ic supernova explosion that occurred between one to four thousand years ago. It has one of the highest radio surface brightnesses, and is one of the brightest X-ray SNRs of our Galaxy. Gamma-ray observations of SNR/MC are a powerful tool to constrain the origin of Galactic cosmic rays, as they can probe the acceleration of hadrons through their interaction with the surrounding medium and subsequent emission of high-energy photons. W49B has been detected in gamma-rays at high energies (0.1-100GeV) and very high energies (> 100 GeV) with the Fermi-LAT and the H.E.S.S. Cherenkov telescopes, respectively. The latest results obtained on W49B with these instruments will be presented. In particular, we will report on the detection of a spectral break at low energies with the Fermi-LAT, similar to that previously found in other SNRs and interpreted as the signature of gamma-ray emission produced through neutral-pion decay. The implications of these results on the particle population and the physical processes leading to the observed gamma-ray emission in W49B will be discussed.
Registration number following "ICRC2015-I/" 562
Collaboration H.E.S.S.

Primary author

Francois Brun (CEA Saclay)

Co-authors

Presentation materials

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