Léa Jouvin - Excess of Very High Energy Cosmic Rays in the Central 100 Pc of the Milky Way

Wednesday 24 Jan 2018, 13:00 → 14:00 Europe/Madrid

Seminar (IFAE)

Marc Manera (IFAE), Michael Leyton (IFAE), Stefano Terzo (IFAE)

The Galactic center (GC) is a very rich and complex astrophysical region. The high supernovae (SN) rate associated with the strong massive star formation should create a sustained cosmic rays (CRs) injection in the GC via the shocks they produce. The region also harbors a Super-Massive Black Hole (SMBH) of 4 * 106 Msun, named Sgr A*. Since it has been argued that the SMBH might also accelerate particles up to very high energies (VHE), its current and past activity could contribute to the CR population. In 2006, the H.E.S.S. collaboration revealed the presence of a VHE diffuse emission in the inner 100 pc of the Galaxy in close correlation with the molecular matter spread in the central molecular zone (CMZ). A major part of the emission is thus certainly of hadronic origin but it still remains mysterious. I will report a new detailed spectral and morphological analysis of this region using 10 years of H.E.S.S. observations as well as a detailed modelling of the gamma-ray emission induced by the SNs.