The main sequence and the fundamental metallicity relation in MaGICC Galaxies: evolution and scatter

Obreja, A.; Brook, C. B.; Stinson, G.; Domínguez-Tenreiro, R.; Gibson, B. K.; Silva, L.; Granato, G. L.

Abstract

Using cosmological galaxy simulations from the MaGICC project, we study the evolution of the stellar masses, star formation rates and gas-phase abundances of star-forming galaxies. We derive the stellar masses and star formation rates using observational relations based on spectral energy distributions by applying the new radiative transfer code GRASIL-3D to our simulated galaxies. The simulations match well the evolution of the stellar mass–halo mass relation, have a star-forming main sequence that maintains a constant slope out to redshift z ∼ 2, and populate projections of the stellar mass – star formation – metallicity plane, similar to observed star-forming disc galaxies. We discuss small differences between these projections in observational data and in simulations, and the possible causes for the discrepancies. The light-weighted stellar masses are in good agreement with the simulation values, the differences between the two varying between 0.06 and 0.20 dex. We also find good agreement between the star formation rate tracer and the true (time-averaged) simulation star formation rates. Regardless, if we use mass- or light-weighted quantities, our simulations indicate that bursty star formation cycles can account for the scatter in the star-forming main sequence.

Citation

Obreja, A., Brook, C. B., Stinson, G., Domínguez-Tenreiro, R., Gibson, B. K., Silva, L., & Granato, G. L. (2014). The main sequence and the fundamental metallicity relation in MaGICC Galaxies: evolution and scatter. Monthly notices of the Royal Astronomical Society, 442(2), 1794-1804. https://doi.org/10.1093/mnras/stu891

• Journal Article Type: Article
• Acceptance Date: May 2, 2014
• Online Publication Date: Jun 16, 2014
• Publication Date: Aug 1, 2014
• Deposit Date: Apr 13, 2016
• Publicly Available Date: Apr 13, 2016
• Journal: Monthly notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 442
• Issue: 2
• Pages: 1794-1804
• DOI: https://doi.org/10.1093/mnras/stu891
• Keywords: Galaxies : abundances, Galaxies : evolution, Galaxies : formation, Galaxies : star formation, Galaxies : stellar content
• Public URL: https://hull-repository.worktribe.com/output/435844
• Publisher URL: http://mnras.oxfordjournals.org/content/442/2/1794
• Additional Information: This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.