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arXiv · 0711.4833

Clues to the Origin of the Mass-Metallicity Relation: Dependence on Star Formation Rate and Galaxy Size

Sara L. Ellison·David R. Patton·Luc Simard·Alan W. McConnachie
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Abstract

We use a sample of 43,690 galaxies selected from the Sloan Digital Sky Survey Data Release 4 to study the systematic effects of specific star formation rate (SSFR) and galaxy size (as measured by the half light radius, r_h) on the mass-metallicity relation. We find that galaxies with high SSFR or large r_h for their stellar mass have systematically lower gas phase-metallicities (by up to 0.2 dex) than galaxies with low SSFR or small r_h. We discuss possible origins for these dependencies, including galactic winds/outflows, abundance gradients, environment and star formation rate efficiencies.

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Sara L. Ellison, David R. Patton, Luc Simard, Alan W. McConnachie. 2007-11-29. Clues to the Origin of the Mass-Metallicity Relation: Dependence on Star Formation Rate and Galaxy Size. https://doi.org/10.1086/527296

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