Speaker
Matthieu Portail
(MPE)
Description
We construct Made-to-Measure dynamical models of the Milky Way's Box/Peanut bulge from the recently measured 3D density of Red Clump Giants (Wegg & Gerhard 2013) and the BRAVA kinematics. Starting from N-body models for barred disks in different dark matter halos we determine the total mass (stellar + dark matter) in the bulge region to be 1.84 10^10 Msun with unprecedented accuracy. We evaluate the mass-to-light and mass-to-clump ratios in the bulge and compare them to theoretical predictions from population synthesis models. We find a consistence with a Kroupa or Chabrier IMF and rule out the Salpeter IMF. To match predictions from the Zoccali IMF derived from the bulge stellar luminosity function requires 40% of dark matter in the bulge region.
