Metallicity Gradients in Simulated Disk Galaxies

Autor:	Pilkington, K., Gibson, B. K.
Rok vydání:	2012
Předmět:	Astrophysics - Galaxy Astrophysics Astrophysics - Cosmology and Extragalactic Astrophysics
Druh dokumentu:	Working Paper
Popis:	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. Comment: To appear in "Galactic Archaeology: Near Field Cosmology and the Formation of the Milky Way"; Proceedings of 3rd Subaru International Conference; Shuzenji; 1-4 Nov 2011; ed. W. Aoki; ASP (2 typos corrected)
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1201.6417 Zobrazit plný text záznamu View this record from Arxiv