Radial mixing in the outer Milky Way disc caused by an orbiting satellite

Details Radial mixing in the outer Milky Way disc caused by an orbiting satellite Radial mixing in the outer Milky Way disc caused by an orbiting satellite

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.397.1599q&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 397, Issue 3, pp. 1599-1606.

Astronomy and Astrophysics

Astronomy

31

Galaxy: Evolution, Galaxy: Kinematics And Dynamics, Galaxy: Structure, Galaxies: Interactions

Scientific paper

Using test particle simulations, we examine the structure of the outer Galactic disc as it is perturbed by a satellite in a tight eccentric orbit about the Galaxy. A satellite of mass a few times 109Msolar can heat the outer Galactic disc, excite spiral structure and a warp and induce streams in the velocity distribution. We examine particle eccentricity versus the change in mean radius between initial and current orbits. Correlations between these quantities are reduced after a few satellite pericentre passages. Stars born in the outer galaxy can be moved in radius from their birth positions and be placed in low eccentricity orbits inside their birth radii. We propose that mergers and perturbations from satellite galaxies and subhaloes can induce radial mixing in the stellar metallicity distribution.

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