Star-Forming Galaxies at z 2: Stellar, Gas and Dynamical Masses and the Mass-Metallicity Relation

Details Star-Forming Galaxies at z 2: Stellar, Gas and Dynamical Masses and the Mass-Metallicity Relation Star-Forming Galaxies at z 2: Stellar, Gas and Dynamical Masses and the Mass-Metallicity Relation

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1908e&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #19.08; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

Using Hα spectra and 0.3--8 μm photometry of over 100 star-forming galaxies at z 2, we compare dynamical masses inferred from the Hα line widths with stellar masses determined from SED modeling and gas masses estimated from the empirical correlation between star formation rate per unit area and gas density. These results suggest a mean gas fraction of 50% and a strong decrease in gas fraction with increasing stellar mass. The combined gas and stellar masses are strongly correlated with the dynamical masses, and are in much better agreement with the dynamical masses than are the stellar masses alone. We also divide the sample into six bins by stellar mass and construct composite Hα and [N II] spectra for each bin. Using the [N II]/Hα ratio to estimate the oxygen abundance, we find a monotonic increase in metallicity with stellar mass. By combining this result with an estimate of the mean gas fraction of the galaxies in each bin, we show that the observed mass-metallicity relation is best described by a model in which galaxies of all masses lose gas to outflows at a rate 4 times higher than their star formation rate.

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