The mass-metallicity relation in cosmological hydrodynamic simulations

Romeel S Dave, K. Finlator, B. D. Oppenheimer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Citations (Scopus)

Abstract

We use cosmological hydrodynamic simulations with enriched galactic outflows to compare predictions for the galaxy mass-metallicity (M* - Z) with observations at z ≈ 2 from Erb et al. (2006). With no outflows included galaxies are over-enriched, indicating that outflows are required not only to suppress star formation and enrich the IGM but also to lower galaxy metal content. The observed M* - Z slope is matched both in our model without winds as well as in our favored outflow model where the outflow velocity scales as the escape velocity, but is too steep in a model with constant outflow speeds. If outflows are too widespread at early times, the IGM out of which smaller galaxies form can become pre-polluted, resulting in a low-mass flattening of the M* - Z relation that is inconsistent with data. Remarkably, the same momentum-driven wind model that provides the best agreement with IGM enrichment data also yields the best agreement with the z ≈ 2 M* - Z relation, showing the proper outflow scaling and strength to match the observed slope and amplitude. In this model, the M* - Z relation evolves slowly from z = 6 → 2; an (admittedly uncertain) extrapolation to z = 0 broadly matches local M* - Z observations. Overall, the M* - Z relation provides critical constraints on galactic outflow processes during the heyday of star formation in the Universe.

Original languageEnglish (US)
Title of host publicationEAS Publications Series
Pages183-189
Number of pages7
Volume24
DOIs
StatePublished - 2007

Publication series

NameEAS Publications Series
Volume24
ISSN (Print)16334760
ISSN (Electronic)16381963

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Galaxies
Hydrodynamics
Stars
Extrapolation
Momentum
Metals

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Dave, R. S., Finlator, K., & Oppenheimer, B. D. (2007). The mass-metallicity relation in cosmological hydrodynamic simulations. In EAS Publications Series (Vol. 24, pp. 183-189). (EAS Publications Series; Vol. 24). https://doi.org/10.1051/eas:2007026

The mass-metallicity relation in cosmological hydrodynamic simulations. / Dave, Romeel S; Finlator, K.; Oppenheimer, B. D.

EAS Publications Series. Vol. 24 2007. p. 183-189 (EAS Publications Series; Vol. 24).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Dave, RS, Finlator, K & Oppenheimer, BD 2007, The mass-metallicity relation in cosmological hydrodynamic simulations. in EAS Publications Series. vol. 24, EAS Publications Series, vol. 24, pp. 183-189. https://doi.org/10.1051/eas:2007026
Dave RS, Finlator K, Oppenheimer BD. The mass-metallicity relation in cosmological hydrodynamic simulations. In EAS Publications Series. Vol. 24. 2007. p. 183-189. (EAS Publications Series). https://doi.org/10.1051/eas:2007026
Dave, Romeel S ; Finlator, K. ; Oppenheimer, B. D. / The mass-metallicity relation in cosmological hydrodynamic simulations. EAS Publications Series. Vol. 24 2007. pp. 183-189 (EAS Publications Series).
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