Direct Method Gas Phase Oxygen Abundances of 4 Lyman Break Analogs

Abstract

We measure the gas-phase oxygen abundances in 4 Lyman Break Analogs (LBAs) using auroral emission lines to derive direct abundances. The direct method oxygen abundances of these objects are generally consistent with the empirically-derived strong-line method values, confirming that these objects are low oxygen abundance outliers from the Mass-Metallicity (MZ) relation defined by star forming SDSS galaxies. We find slightly anomalous excitation conditions (Wolf-Rayet features) that could potentially bias the empirical estimates towards high values if caution is not exercised in the selection of the strong-line calibration used. The high rate of star formation and low oxygen abundance of these objects is consistent with the predictions of the Fundamental Metallicity Relation (FMR), in which the infall of relatively unenriched gas simultaneously triggers an episode of star formation and dilutes ISM of the host galaxy.

13 pages, 10 figures, 4 tables. Minor changes. Accepted for publication in ApJ. For a brief video explaining this paper, see http://youtu.be/C2iQH86p_dw

References in corpus (12)

• The Host Galaxies and Classification of Active Galactic Nuclei
• UV Star Formation Rates in the Local Universe
• The Mass-Metallicity Relation at z~2
• Galaxy Pairs in the Sloan Digital Sky Survey I: Star Formation, AGN Fraction, and the Luminosity/Mass-Metallicity Relation
• Clues to the Origin of the Mass-Metallicity Relation: Dependence on Star Formation Rate and Galaxy Size
• The Universal Relation of Galactic Chemical Evolution: The Origin of the Mass-Metallicity Relation
• Galaxies with Wolf-Rayet signatures in the low-redshift Universe - A survey using the Sloan Digital Sky Survey
• Resolving the electron temperature discrepancies in HII Regions and Planetary Nebulae: kappa-distributed electrons
• The Oxygen Abundances of Luminous and Ultraluminous Infrared Galaxies
• HST morphologies of local Lyman break galaxy analogs I: Evidence for starbursts triggered by merging
• The Diverse Properties of the Most Ultraviolet Luminous Galaxies Discovered by the Galaxy Evolution Explorer
• The Young and the Dustless: Interpreting Radio Observations of UltraViolet Luminous Galaxies

Cited by in corpus (4)

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• Oxygen abundance maps of CALIFA galaxies
• Tracing ionized gas kinematics in Lyman-Break Analogs. Implications for star formation compactness and outflow properties