J. Devin on behalf of the H.E.S.S. collaboration, A. Lemière on behalf of the H.E.S.S. collaboration, K. Streil on behalf of the H.E.S.S. collaboration, R. Terrier on behalf of the H.E.S.S. collaboration, C. van Eldik on behalf of the H.E.S.S. collaboration

We performed a spectro-morphological analysis of the diffuse emission in the Galactic center region with H.E.S.S. gamma-ray data. We relied on templates to model the diffuse emissions (the Galactic center ridge and the foreground component) and on a 3D likelihood fitting approach. We first assessed the validity of a continuous injection scenario near the Galactic center by investigating possible deviations from a 1/r profile of the cosmic-ray distribution and potential spectral variations within the Galactic center ridge. We found the data can appropriately be described by a scenario in which a steady source near the Galactic center continuously injects cosmic rays which diffuse through the Central Molecular Zone. We then derived the best-fit spectral parameters of the Galactic center ridge emission and we found a spectral transition near 10-20 TeV.