Constraints on the distribution of gas and young stars in the Galactic Centre in the context of interpreting gamma ray emission features

Understand

Gamma ray observations have found evidence of an extremely energetic outflow emanating from the Galactic Centre, and an `excess' of emission at GeV energies towards the Galactic Centre over that expected from current models.

• Determining whether the outflow is AGN- or star formation-driven, and whether the `excess' is astrophysical in origin or requires new physics (e.g.
• self-annihilation of dark matter), requires the accurate modelling of the expected energy injection from astrophysical sources and the subsequent interaction with the surrounding environment.
• We briefly summarise current constraints on the distribution of gas and young stars in the inner few hundred parsec of the Galaxy that can be included in future 2D and 3D modelling of the astrophysical gamma ray emission.