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.
| Registration number following "ICRC2015-I/" | 310 |
|---|---|
| Collaboration | H.E.S.S. |
Author
Igor Oya
(DESY Zeuthen)
