The effects of radial migration on the vertical structure of Galactic discs

We present evidence that isolated growing discs, subject to internal spiral perturbations, thicken due to both heating and radial migration. We show this by demonstrating that the thickness and vertical velocity dispersions of coeval stars depend on their age as well as the change in their radii. Wh...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2013-08, Vol.433 (2), p.976-985
Main Authors: Roškar, Rok, Debattista, Victor P., Loebman, Sarah R.
Format: Article
Language:English
Subjects:
Accretion disks
Milky Way
Star & galaxy formation
Velocity
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Summary:We present evidence that isolated growing discs, subject to internal spiral perturbations, thicken due to both heating and radial migration. We show this by demonstrating that the thickness and vertical velocity dispersions of coeval stars depend on their age as well as the change in their radii. While the disc thickens due to internal processes, we find that this induces only a minor amount of flaring. We further demonstrate the consequences of such thickening on the structural properties of stellar populations and find that they qualitatively agree with recent studies of the Milky Way disc.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stt788