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We have developed our original made-to-measure (M2M) algorithm, PRIMAL, withthe aim of modelling the Galactic disc from upcoming Gaia data. From a MilkyWay like N-body disc galaxy simulation, we have created mock Gaia data usingM0III stars as tracers, taking into account extinction and the expected Gaiaerrors. In PRIMAL, observables calculated from the N-body model are comparedwith the target stars, at the position of the target stars. Using PRIMAL, themasses of the N-body model particles are changed to reproduce the target mockdata, and the gravitational potential is automatically adjusted by the changingmass of the model particles. We have also adopted a new resampling scheme forthe model particles to keep the mass resolution of the N-body model relativelyconstant. We have applied PRIMAL to this mock Gaia data and we show that PRIMALcan recover the structure and kinematics of a Milky Way like barred spiraldisc, along with the apparent bar structure and pattern speed of the bardespite the galactic extinction and the observational errors.

A PRIMAL view of the Milky Way, made possible by Gaia and M2M modelling