Abstract
We obtained UV rest-frame spectra of 20 galaxies with 2.37 ≤ z ≤ 3.40 in the FORS Deep Field, using FORS2 at the ESO VLT. The spectral resolution of R ≈ 2000 allows us to measure the purely photospheric indices “1370” and “1425” (Leitherer et al. 2001). These indices are good metallicity indicators, unaffected by the starburst age or interstellar absorption lines. We measure an increase of both indices with decreasing redshift, indicating an increase of the average metallicity of bright starburst galaxies with cosmic time.
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