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https://hdl.handle.net/2440/126306
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Type: | Journal article |
Title: | MaGICC thick disc - I. Comparing a simulated disc formed with stellar feedback to the milky way |
Author: | Stinson, G.S. Bovy, J. Rix, H.W. Brook, C. Roškar, R. Dalcanton, J.J. Macciò, A.V. Wadsley, J. Couchman, H.M.P. Quinn, T.R. |
Citation: | Monthly Notices of the Royal Astronomical Society, 2013; 436(1):625-634 |
Publisher: | Oxford University Press |
Issue Date: | 2013 |
ISSN: | 0035-8711 1365-2966 |
Statement of Responsibility: | G. S. Stinson, J. Bovy, H.-W. Rix, C. Brook, R. Roškar, J. J. Dalcanton ... et al. |
Abstract: | We analyse the structure and chemical enrichment of a Milky Way-like galaxy with a stellar mass of 2 × 1010 M⊙, formed in a cosmological hydrodynamical simulation. It is disc dominated with a flat rotation curve, and has a disc scalelength similar to the Milky Way's, but a velocity dispersion that is ∼50 per cent higher. Examining stars in narrow [Fe/H] and [α/Fe] abundance ranges, we find remarkable qualitative agreement between this simulation and observations. (a) The old stars lie in a thickened distribution with a short scalelength, while the young stars form a thinner disc, with scalelengths decreasing, as [Fe/H] increases. (b) Consequently, there is a distinct outward metallicity gradient. (c) Mono-abundance populations exist with a continuous distribution of scaleheights (from thin to thick). However, the simulated galaxy has a distinct and substantive very thick disc (hz ∼ 1.5 kpc), not seen in the Milky Way. The broad agreement between simulations and observations allows us to test the validity of observational proxies used in the literature: we find in the simulation that mono-abundance populations are good proxies for single age populations (<1 Gyr) for most abundances. |
Keywords: | Hydrodynamics, galaxies: formation, galaxies: structure |
Rights: | © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society |
DOI: | 10.1093/mnras/stt1600 |
Published version: | http://dx.doi.org/10.1093/mnras/stt1600 |
Appears in Collections: | Aurora harvest 4 Physics publications |
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