Potential of the Galaxy from the Besançon Galaxy Model including the triaxial bar

J. G. Fernández-Trincado, A. C. Robin and C. Reyne (UTINAM, Besançon, France)*

We present a preliminary attempt to include a bar potential in the previously axisymmetric potential of the Besancon Galaxy model (hereafter BGM; Robin et al. 2003, 2012), consistently with the mass model. The contribution of the triaxial bar is modeled by superposition of four homogeneous ellipsoids to approximate the observed density law (Freudenreich 1998). Finally, we have computed the field forces and potential according to the methodology described by Pichardo et al. (2004) in order to constraint the total mass of the Milky Way. We shall present the new fit to the rotation curve and constraints on the dark halo shape. This new approach allows us to use the new dynamical constraints (old BGM + triaxial bar) and predictions of kinematics and comparison with upcoming large-scale survey such as RAVE, BRAVA, APOGEE, and GAIA in the near future.

Topic revision: r1 - 2014-11-28 - SusanaBascon
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