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Nitrogen Production in Starburst Galaxies Detected by GALEX

2007; Institute of Physics; Volume: 173; Issue: 2 Linguagem: Inglês

10.1086/518833

1538-4365

Ryan P. Mallery, Lisa J. Kewley, R. Michael Rich, Samir Salim, S. Charlot, Christy Tremonti, Mark Seibert, Todd Small, Ted Wyder, Tom A. Barlow, Karl Förster, Peter G. Friedman, D. Christopher Martin, Patrick Morrissey, S. G. Neff, David Schiminovich, L. Bianchi, J. Donas, Timothy M. Heckman, Young‐Wook Lee, Barry F. Madore, Bruno Milliard, Alexander S. Szalay, Barry Y. Welsh, Sukyoung K. Yi,

Stellar, planetary, and galactic studies

We investigate the production of nitrogen in star-forming galaxies with ultraviolet (UV ) radiation detected by the Galaxy Evolution Explorer Satellite (GALEX ).We use a sample of 8745 GALEX emission-line galaxies matched to the Sloan Digital Sky Survey (SDSS) spectroscopic sample.We derive both gas-phase oxygen and nitrogen abundances for the sample and apply stellar population synthesis models to derive stellar masses and star formation histories of the galaxies.We compare oxygen abundances derived using three different diagnostics.We derive the specific star formation rates of the galaxies by modeling the seven-band GALEX+SDSS photometry.We find that galaxies that have log (SFR/M Ã ) k À10:0 typically have values of log (N/O) $ 0:05 dex less than galaxies with log (SFR/M Ã ) P À10:0 and similar oxygen abundances.