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Title: Direct method gas-phase oxygen abundances of four Lyman break analogs

We measure the gas-phase oxygen abundances in four Lyman break analogs 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 Sloan Digital Sky Survey galaxies. We find slightly anomalous excitation conditions (Wolf-Rayet features) that could potentially bias the empirical estimates toward high values if caution is not exercised in the selection of the strong-line calibration. The high rate of star formation and low oxygen abundance of these objects is consistent with the predictions of the fundamental metallicity relation, in which the infall of relatively unenriched gas simultaneously triggers an episode of star formation and dilutes the interstellar medium of the host galaxy.
Authors:
; ;  [1]
  1. Department of Astronomy, The Ohio State University, Columbus, OH 43201 (United States)
Publication Date:
OSTI Identifier:
22365079
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 792; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CALIBRATION; ELEMENT ABUNDANCE; EMISSION; EXCITATION; GALAXIES; HOST; INTERSTELLAR SPACE; LYMAN LINES; MASS; METALLICITY; OXYGEN; RED SHIFT; SKY; STARS; WOLF-RAYET STARS