Constraining the Milky Way potential using the dynamical kinematic substructures

Details Constraining the Milky Way potential using the dynamical kinematic substructures Constraining the Milky Way potential using the dynamical kinematic substructures

2011-10-20

arxiv.org/abs/1110.4505v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

2 pages, 4 figures, to appear in the proceedings of "Assembling the Puzzle of the Milky Way", Le Grand Bornand (Apr. 17-22, 20

Scientific paper

We present a method to constrain the potential of the non-axisymmetric components of the Galaxy using the kinematics of stars in the solar neighborhood. The basic premise is that dynamical substructures in phase-space (i.e. due to the bar and/or spiral arms) are associated with families of periodic or irregular orbits, which may be easily identified in orbital frequency space. We use the "observed" positions and velocities of stars as initial conditions for orbital integrations in a variety of gravitational potentials. We then compute their characteristic frequencies, and study the structure present in the frequency maps. We find that the distribution of dynamical substructures in velocity- and frequency-space is best preserved when the integrations are performed in the "true" gravitational potential.

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