Metallicity Gradients in Simulated Disk Galaxies

Details Metallicity Gradients in Simulated Disk Galaxies Metallicity Gradients in Simulated Disk Galaxies

2012-01-31

arxiv.org/abs/1201.6417v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

To appear in "Galactic Archaeology: Near Field Cosmology and the Formation of the Milky Way"; Proceedings of 3rd Subaru Intern

Scientific paper

The stellar metallicity and abundance ratio gradients from the fiducial late-type galaxy simulation of Stinson et al. (2010) are presented. Over 1-3 scalelengths, gradients are shown to flatten with time, consistent with empirical evidence at high- and low-redshifts. Kinematic effects, including radial migration, though, flatten these intrinsicly steep gradients such that by redshift z=0, the measured gradients of these (now) old stars are flatter than their young counterparts, in contradiction to what is observed locally. Conversely, the stellar [O/Fe] gradient is (to first order) robust against migration, remaining fairly flat for both young and old populations today.

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