Balancing Outflows and Gas Dilution: The Mass-Metallicity Relation at z=0

Details Balancing Outflows and Gas Dilution: The Mass-Metallicity Relation at z=0 Balancing Outflows and Gas Dilution: The Mass-Metallicity Relation at z=0

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532603p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #326.03; Bulletin of the American Astronomical Society, Vol. 42, p.423

Astronomy and Astrophysics

Astronomy

Scientific paper

The gas-phase oxygen abundances of star-forming galaxies are tightly correlated with the galaxies' stellar masses such that more massive galaxies are more oxygen-rich. Because oxygen is produced on relatively short timescales (˜10 Myr), this so-called mass-metallicity relation is a sequence of oxygen depletion: low-mass galaxies are metal-depleted relative to the true nucleosynthetic yield rather than massive galaxies being preferentially enriched. Preferential metal-depletion can be caused by either diluting the gas (e.g., via higher accretion rates of pristine gas or by lower star-formation efficiencies) or by preferentially removing metals from low-mass galaxies via galaxy winds. I will use simple analytic arguments to show how the observed mass-metallicity relation implies a required balance between gas dilution and gas outflow.

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