The origin and evolution of the galaxy mass-metallicity relation

Xiangcheng Ma*, Philip F. Hopkins, Claude André Faucher-Giguère, Nick Zolman, Alexander L. Muratov, Dušan Kereš, Eliot Quataert

*Corresponding author for this work

Research output: Contribution to journalArticle

143 Scopus citations

Abstract

We use high-resolution cosmological zoom-in simulations from the Feedback in Realistic Environment (FIRE) project to study the galaxy mass-metallicity relations (MZR) from z = 0-6. These simulations include explicit models of the multiphase ISM, star formation, and stellar feedback. The simulations cover halo masses Mhalo = 109-1013Mo˙ and stellar masses M* = 104-1011Mo˙ at z=0 and have been shown to produce many observed galaxy properties from z=0-6. For the first time, our simulations agree reasonablywellwith the observedmass-metallicity relations at z = 0-3 for a broad range of galaxy masses. We predict the evolution of the MZR from z = 0-6, as log(Zgas/Z) = 12 + log(O/H) -9.0 = 0.35[log(M*/M) -10] + 0.93 exp(-0.43z) -1.05 and log(Z*/Z) = [Fe/H] + 0.2 = 0.40[log(M*/M) -10] + 0.67 exp(-0.50z) -1.04, for gas-phase and stellar metallicity, respectively. Our simulations suggest that the evolution of MZR is associated with the evolution of stellar/gas mass fractions at different redshifts, indicating the existence of a universal metallicity relation between stellar mass, gas mass, and metallicities. In our simulations, galaxies above M* = 106Mo˙ are able to retain a large fraction of their metals inside the halo, because metal-rich winds fail to escape completely and are recycled into the galaxy. This resolves a longstanding discrepancy between 'subgrid' wind models (and semi-analytic models) and observations, where common subgrid models cannot simultaneously reproduce the MZR and the stellar mass functions.

Original languageEnglish (US)
Pages (from-to)2140-2156
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume456
Issue number2
DOIs
StatePublished - 2016

Keywords

  • Cosmology: theory
  • Galaxies: evolution
  • Galaxies: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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