The oxygen abundance in the IFU era
F. F. Rosales-Ortega, S. F. S\'anchez, A. I. D\'iaz
TL;DR
This paper discusses how integral field units (IFUs) enable detailed spatial analysis of gas-phase oxygen abundance in galaxies, revealing universal abundance gradients and a new local mass-metallicity relation in HII regions.
Contribution
It introduces a statistical method for analyzing oxygen abundance gradients and uncovers a novel local mass-metallicity relation using IFU data.
Findings
Universal radial oxygen abundance gradient in spiral galaxies
Discovery of a local mass-metallicity relation in HII regions
Enhanced understanding of galaxy chemical evolution
Abstract
Spatially-resolved information of gas-phase emission provided by integral field units (IFUs) are allowing us to perform a new generation of emission-line surveys, based on large samples of HII regions and full two-dimensional coverage. Here we present two highlights of our current studies employing this technique: 1) A statistical approach to the abundance gradients of spiral galaxies, which indicates an -universal- radial gradient for oxygen abundance; and 2) The discovery of a new scaling relation of HII regions in spiral galaxies, the "local" mass-metallicity relation of star-forming galaxies.
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Stellar, planetary, and galactic studies