Speaker
Description
SNRs are considered to be the main sites in the Milky Way for producing cosmic rays with energies up to a few 10^15 eV. Among them, shell-like SNRs exhibit a morphology spatially coincident with the shock front of the SNR and are of great interest in the context of particle acceleration. Their common characteristics are a young age, a large angular size and TeV emission highly correlated with X-ray synchrotron emission.
I will report the GeV gamma-ray detections of the shell-type SNRs HESS J1731−347 and SN 1006 using 8 years of Fermi-LAT Pass 8 data. Overall, the hard spectra of these SNRs suggest a common scenario in which the bulk of the gamma-ray emission is produced by inverse Compton scattering of high energy electrons. However, this does not rule out efficient hadron acceleration in these TeV shells and the spectral slope asymmetry visible in the case of SN 1006 might be a first evidence in this respect. These results will be compared with the 3 other TeV shell-type SNRs providing a first complete census of this class of source at gamma-ray energies.
