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Insights on the Milky Way bulge formation from the correlations between kinematics and metallicity

Carine Babusiaux (GEPI)

Although the Milky Way bulge is our closest opportunity to study in detail such a complex chemo-dynamical system, its formation and evolution is still poorly understood. The high extinction, the crowding, and the superposition of multiple structures along the line of sight make studies of the inner Galactic regions challenging. Two main scenarios have been invoked for the bulge formation : gravitational collapse or hierarchical merging of subclumps and secular evolution of the disc through a bar forming a pseudo-bulge. I will present evidences that both scenarios have taken place in the Galactic bulge.