Empirical constraints for the magnitude and composition of galactic winds

H. Jabran Zahid, Paul Torrey, Mark Vogelsberger, Lars Hernquist, Lisa Kewley, Romeel Davé

Research output: Contribution to journalArticle

Abstract

Galactic winds are a key physical mechanism for understanding galaxy formation and evolution, yet empirical and theoretical constraints for the character of winds are limited and discrepant. Recent empirical models find that local star-forming galaxies have a deficit of oxygen that scales with galaxy stellar mass. The oxygen deficit provides unique empirical constraints on the magnitude of mass loss, com-position of outflowing material and metal reaccretion onto galaxies. We formulate the oxygen deficit constraints so they may be easily implemented into theoretical models of galaxy evolution. We parameterize an effective metal loading factor which combines the uncertainties of metal outflows and metal reaccretion into a single function of galaxy virial velocity.We determine the effective metal loading factor by forward-fitting the oxygen deficit. The effective metal loading factor we derive has important implications for the implementation of mass loss in models of galaxy evolution.

Original languageEnglish (US)
Pages (from-to)873-879
Number of pages7
JournalAstrophysics and Space Science
Volume349
Issue number2
DOIs
StatePublished - 2014

Keywords

  • Galaxies: abundances
  • Galaxies: ISM
  • Galaxies: star-formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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