The metallicity-luminosity relation at medium redshift based on faint CADIS emission line galaxies*
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
2 Department of Physics, Swiss Federal Institute of Technology (ETH Zürich), ETH Hönggerberg, 8093, Zürich, Switzerland
Corresponding author: C. Maier, email@example.com
Accepted: 28 January 2004
The emission line survey within the Calar Alto Deep Imaging Survey (CADIS) detects galaxies with very low continuum brightness by using an imaging Fabry-Perot interferometer. With spectroscopic follow-up observations of CADIS galaxies using FORS2 at the VLT and DOLORES at TNG we obtained oxygen abundances of 5 galaxies at and 10 galaxies at . Combining these measurements with published oxygen abundances of galaxies with we find evidence that a metallicity-luminosity relation exists at medium redshift, but it is displaced to lower abundances and higher luminosities compared to the metallicity-luminosity relation in the local universe. Comparing the observed metallicities and luminosities of galaxies at with Pégase2 chemical evolution models we have found a favoured scenario in which the metallicity of galaxies increases by a factor of ~2 between and today, and their luminosity decreases by ~ mag.
Key words: galaxies: high-redshift / galaxies: abundances
© ESO, 2004