The Galactic Centre (GC) is a unique astrophysical environment dominated by extreme objects such as the supermassive black hole (SMBH) Sgr A* and three of the most massive  young star clusters in the Galaxy. Gamma-ray observations of interstellar gamma-ray emission using the High Energy Stereoscopic System (HESS) have revealed that a quasi-steady source near the GC injects energetic cosmic rays (CRs) into the surrounding region. These CRs propagate through the inner 200 parsecs (pc) of the Galaxy, creating a gradient in cosmic ray density. 
The nature of the source is debated. On the one hand, accretion processes onto Sgr A* dissipate a large power that can be converted to particle acceleration. On the other, supernova explosions shocks and stellar winds from massive star clusters are known to produce copious amount of CRs.  
The objective of the internship is to search for evidences of non stationarity of the CR profile by measuring the possible energy dependence of the density profile.  
The candidate will use data from the HESS experiment and model them using the gammapy analysis framework and a model of the 3D gas distribution in the GC. The results could help resolve the question of whether the SMBH or massive star formation predominantly drives cosmic-ray activity in the inner Galaxy.