Kinematics of the Milky Way spiral arms driven by the invariant manifolds

Details Kinematics of the Milky Way spiral arms driven by the invariant manifolds Kinematics of the Milky Way spiral arms driven by the invariant manifolds

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..548r&link_type=abstract

Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held

Astronomy and Astrophysics

Astrophysics

Scientific paper

Here we present the analysis and properties of the Milky Way stellar arms. We apply the recent theory of the invariant manifolds to obtain the locus of the spiral arms and rings of a bar galactic potential. This theory is based on the dynamics driven by the invariant manifolds of unstable periodic orbits. The invariant manifolds are asymptotic orbits that act as a tube that can trap and drive material (Romero-Gomez et al. 2006, 2007; Athanassoula, Romero-Gomez & Masdemont 2009; Athanassoula et al. 2010). We compute the invariant manifolds of a barred potential, where no spiral perturbation is induced. We briefly explain the details of the dynamics driven by the manifolds and we compare the properties and locus obtained by the potentials used in the literature to describe the Galactic bar. In particular, we compare the kinematics given by both the manifolds and the CO emission from observations (Dame, Hartmann & Thaddeus 2001). To do so we plot longitude -- heliocentric radial velocity diagrams, (l,v)-diagrams. We observe that the kinematics driven by the orbits reproduce well the Galactic Molecular Ring and, in some cases, the 3 kpc arms.

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