Radial Mixing due to Spiral-Bar Resonance Overlap: Implications to the Milky Way

Details Radial Mixing due to Spiral-Bar Resonance Overlap: Implications to the Milky Way Radial Mixing due to Spiral-Bar Resonance Overlap: Implications to the Milky Way

2010-09-26

arxiv.org/abs/1009.5079v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 pages, 2 figures, presented at ELSA 2010: Gaia, at the frontiers of astrometry, 7-11 June 2010, S\`evres, Paris; To publishe

Scientific paper

We have recently identified a previously unknown radial migration mechanism resulting from the overlap of spiral and bar resonances in galactic discs (Minchev & Famaey 2010, Minchev et al. 2010). This new mechanism is much more efficient than mixing by transient spirals and its presence is unavoidable in all barred galaxies, such as our own Milky Way. The consequences of this are a strong flattening in the metallicity gradient in the disc, an extended disc profile, and the formation of a thick disc component, all taking place in only a couple of Gyr. This timescale is drastically shorter than previously expected and thus can put strong constraints on the longevity, strength and pattern speeds of the Galactic bar and Spiral Structure.

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