[38.09] The GEMINI Deep Deep Survey: The Mass-Metallicity Relation at High Redshift

AAS 205th Meeting, 9-13 January 2005
Session 38 Cosmic Evolution of Mass and Metallicity
Oral, Monday, January 10, 2005, 2:00-3:30pm, Town and Country

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[38.09] The GEMINI Deep Deep Survey: The Mass-Metallicity Relation at High Redshift

S. Savaglio, K. Glazebrook (Johns Hopkins University), D. Le Borgne (U. Toronto), S. Juneau (NRC Victoria), R. Abraham (U. Toronto), H.-W. Chen (MIT), D. Crampton (NRC Victoria), P. McCarthy (Carnegia Obs., Pasadena), I. Hook, I. Jorgensen, K. Roth (Gemini Obs.), R. Calberg (U. Toronto), R. Marzke (SFSU), R. Murowinski (NRC Victoria)

We have investigated the metallicity as a function of stellar mass in galaxies at 0.4 < z < 1, obtained for about 28 galaxies in the K-band selected Gemini Deep Deep Survey (GDDS). This sample is combined with about 41 galaxies in 0.5 < z < 0.9 from the Canada-France Redshift Survey (CFRS), for which we measured masses using identical methods. We observe a mass-metallicity relation similar to what seen in z~.1 SDSS galaxies, but displaced towards higher masses and/or lower metallicities. Using these samples, and a small sample of z~.3 LBGs, we propose a redshift dependent mass-metallicity relation which would explain the observed results. Finally, from the GDDS and CFRS samples together, we found a 0.4 < z < 1 metallicity-luminosity relation shifted towards higher luminosities, with respect to local galaxies. We interpret this result as due to the observed decrease of the stellar mass-to-light ratio M/L at higher redshift.

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