Gas dynamics driven by the two bars of the Milky Way

Details Gas dynamics driven by the two bars of the Milky Way Gas dynamics driven by the two bars of the Milky Way

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..352r&link_type=abstract

SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present a model of the Milky Way, based on 2MASS star counts, that includes three components: disk, bulge (or large bar) and a small nuclear bar. We have used this mass distribution to obtain an accurate stellar potential and to simulate the gas dynamics of the Galaxy, in particular in the nuclear region. Our dynamical simulations confirm the presence of a nuclear bar. Furthermore, we can constrain the nuclear bar mass. In order to explain the large velocity dispersion of the molecular gas in the nuclear region, the nuclear bar mass should be (4-8) 109 M&sun;, i.e., 10-20 % of the bulge mass.

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