RCW 86, an extended supernova remnant viewed at high energy with the Fermi-LAT(pdf)
RCW 86 is a young supernova remnant detected as a wide shell in optical, radio and X-rays and probably associated to the historical supernova SN 185. Already detected as a point-like source at GeV energy, the recent analysis of more than 6 years of Pass 8 Fermi-LAT data revealed a significant extended gamma-ray emission towards the position of RCW 86. The results of our deep morphological and spectral analysis provide new constraints on the origin of the gamma-ray emission and on key parameters such as the density of the surrounding medium and the total energy in accelerated particles. These constraints will be presented and discussed in the light of existing estimates.