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

Evidence for a spectral turnover in the broadband gamma-ray emission from SNR Puppis A revealed by H.E.S.S. observations

Aug 4, 2015, 4:00 PM
1h
Mississippi Foyer (World Forum)

Mississippi Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 72
Poster contribution GA-EX Poster 3 GA

Speaker

Igor Oya (DESY Zeuthen)

Description

The 4 kyr-old supernova remnant (SNR) Puppis A shows strong evidence of interaction between the forward shock and a molecular cloud. The results from Fermi-LAT indicate extended HE gamma-ray emission with a 0.2-100 GeV spectrum that does not significantly deviate from a power law, in contrast to most of the GeV-bright SNRs known to be interacting with molecular clouds. In order to characterize the position of this spectral feature at higher energies, very-high-energy (VHE, E > 0.1 TeV) gamma-ray observations of Puppis A were carried out with the H.E.S.S. telescope array. The analysis of the H.E.S.S. data did not reveal any significant emission towards Puppis A. The upper limits on the differential photon flux imply that its broadband gamma-ray spectrum must exhibit a spectral break, estimated to be below 280 GeV, or alternatively a cutoff below ~450 GeV or ~280 GeV when assuming exponential or sub-exponential cutoff in the power law spectrum, respectively. These results provide insights into our understanding of the processes accelerating particles in the shock front of Puppis A.
Collaboration H.E.S.S.
Registration number following "ICRC2015-I/" 310

Primary author

Igor Oya (DESY Zeuthen)

Co-authors

Presentation materials