Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-02
Astron.Astrophys. 418 (2004) 475-485
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A; 12 pages, 9 figures
Scientific paper
10.1051/0004-6361:20035795
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 MB>~-19 CADIS galaxies using FORS2 at the VLT and DOLORES at TNG we obtained oxygen abundances of 5 galaxies at z~0.4 and 10 galaxies at z~0.64. Combining these measurements with published oxygen abundances of galaxies with MB<~-19 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 z<3 with Pegase2 chemical evolution models we have found a favoured scenario in which the metallicity of galaxies increases by a factor of ~2 between z~0.7 and today, and their luminosity decreases by ~0.5-0.9mag.
Hippelein H. H.
Maier Ch.
Meisenheimer Klaus
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