Fermi Gamma-ray Space Telescope

Study of the extended Supernova Remnant RCW86 with Pass8 Fermi-LAT data

Micaela Caragiulo
Caragiulo M., Condon B., Hewitt J. W., Lemoine-Goumard M., Giordano F. on behalf of the Fermi-LAT Collaboration

Abstract:

The Fermi Large Area Telescope (LAT) collaboration has recently developed the new Pass8 event reconstruction, resulting in enhanced effective area at both high and low energies. These improvements result in a better capability to search for extended sources at high energy. The young supernova remnant (SNR) RCW 86, probably originated from Type Ia Supernova explosion in AD 185 and located at a distance of 2.3-2.8 kpc, was analyzed using Pass8 data. The results report an extension consistent with the TeV size observed by HESS but with a steep spectrum in the LAT energy range. We have also developed a multi-wavelength model that describes the SNR spectral energy distribution. This fit provides constraints on the electron spectrum at high energy. These results will be discussed, focusing on the acceleration efficiency both for proton and electron populations and on the electron-proton ratio.