19.7 Chemical cartography of the Milky Way

Gaia DR3 opens a new era of all-sky spectroscopy and chemo-physical characterisation of Galactic stellar populations. It includes a new transformational data set that confirms Gaia’s leading role in the golden age of galactic archaeology: the largest homogeneous spectral analysis performed so far with a total of almost 5.6 million stars observed by the Radial Velocity Spectrometer (Katz et al. 2023) and parametrized by the General Stellar Parametrizer - Spectroscopy (Recio-Blanco et al. 2023).

Gaia Collaboration et al. (2023h) demonstrates the scientific quality of Gaia’s Milky Way chemical cartography through a chemo-dynamical analysis of disc and halo populations. Gaia DR3 stellar spectroscopic atmospheric parameters and chemical abundances are combined with Gaia DR3 radial velocities and Gaia EDR3 astrometry to analyse the relationships between chemistry and Milky Way structure, stellar kinematics, and orbital parameters. The computed Galactic coordinates, velocities, actions and orbital parameters are provided in a table.