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Radial mixing due to spiral–bar resonance overlap: Implicationsto the Milky Way

Published online by Cambridge University Press:  15 February 2011

C. Turon ,
F. Meynadier ,
F. Arenou ,
I. Minchev  and
B. Famaey
I. Minchev
Affiliation:
Observatoire Astronomique, Université de Strasbourg, CNRS UMR 7550, 67000 Strasbourg, France
B. Famaey
Affiliation:
Observatoire Astronomique, Université de Strasbourg, CNRS UMR 7550, 67000 Strasbourg, France
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Abstract

We have recently identified a previously unknown radial migration mechanism resultingfrom the overlap of spiral and bar resonances in galactic discs (Minchev & Famaey2010; Minchev et al. 2010b). This new mechanism is much more efficient thanmixing by transient spirals and its presence is unavoidable in all barred galaxies, suchas our own Milky Way. The consequences of this are a strong flattening in the metallicitygradient in the disc, an extended disc profile, and the formation of a thick disccomponent, all taking place in only a couple of Gyr. This timescale is drastically shorterthan previously expected and thus can put strong constraints on the longevity, strengthand pattern speeds of the Galactic bar and Spiral Structure.

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Type
Research Article
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European Astronomical Society Publications Series , Volume 45: GAIA: At the Frontiers of Astrometry , 2010 , pp. 299 - 302
Copyright
© EAS, EDP Sciences 2011

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