Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-09-04
Astrophys.J.695:259-267,2009
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ; 11 pages, 11 figures
Scientific paper
10.1088/0004-637X/695/1/259
We present a sample of 42 high-mass low-metallicity outliers from the mass--metallicity relation of star-forming galaxies. These galaxies have stellar masses that span log(M_*/M_sun) ~9.4 to 11.1 and are offset from the mass--metallicity relation by -0.3 to -0.85 dex in 12+log(O/H). In general, they are extremely blue, have high star formation rates for their masses, and are morphologically disturbed. Tidal interactions are expected to induce large-scale gas inflow to the galaxies' central regions, and we find that these galaxies' gas-phase oxygen abundances are consistent with large quantities of low-metallicity gas from large galactocentric radii diluting the central metal-rich gas. We conclude with implications for deducing gas-phase metallicities of individual galaxies based solely on their luminosities, specifically in the case of long gamma-ray burst host galaxies.
Peeples Molly S.
Pogge Richard W.
Stanek Kris Z.
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