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Title:
Optical and near-IR luminosity-metallicity relations of star-forming emission-line galaxies
Authors:
Lee, J. C.; Salzer, J.; Melbourne, J.
Publication:
Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M. González Delgado. Astrophysics & Space Science Library, Vol. 329. Dordrecht: Springer, 2005, p.P38
Publication Date:
05/2005
Origin:
AUTHOR
Bibliographic Code:
2005ASSL..329P..38L

Abstract

Using nebular oxygen abundances computed through the direct electron temperature method (Te) for 23 star-forming emission-line galaxies from the KPNO International Spectroscopic Survey (KISS) in conjunction with other Te-based measurements from the literature, we demonstrate that H II galaxies and more quiescent dwarf irregular galaxies follow similar metallicity-luminosity (L-Z) relationships. The primary difference is a zero-point shift between the correlations such that H II galaxies are brighter by an average of 0.8 B magnitudes at a given metallicity. This offset can be used as evidence to argue that low-luminosity H II galaxies typically undergo a factor of two luminosity enhancements, and that starbursts that elevate the luminosities of their host galaxies by 2 to 3 magnitudes are not as common. We also demonstrate that the inclusion of interacting galaxies can increase the scatter in the L-Z relation and may force the observed correlation toward lower metallicities and/or larger luminosities. This must be taken into account when attempting to infer metal abundance evolution by comparing local L-Z relations with ones based on higher-redshift samples since the fraction of interacting galaxies should increase with look-back time. The 23 KISS Te-based measurements are further used to calibrate a strong-line abundance estimator, which allows us to compute metallicities for a much larger set of galaxies in the local Universe (z < 0.09) and to study the L-Z relationship in 5 different bandpasses over a luminosity range spanning 8 magnitudes.
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