Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-03
Astronomy and Astrophysics
Astrophysics
10 pages, 4 figures. Accepted by A&A
Scientific paper
10.1051/0004-6361:20054066
Using FORS2 at the ESO VLT we obtained medium resolution (R ~ 2000) spectra of 12 galaxies with 2.37 < z < 3.40 in the FORS Deep Field. Two individual spectra with good S/N and a composite of all 12 spectra were used to derive properties of the stellar and interstellar absorption lines of galaxies in this redshift range. Systematic differences between the individual spectra were found for the strength and profiles of the intrinsic interstellar lines. For eight spectra with sufficient S/N we measured the `1370' and `1425' metallicity indices. From these indices we find for our sample that galaxies at z > 3 have lower mean metallicity than galaxies at 2.5 < z < 3. However there remain uncertainties concerning the absolute calibration of the metallicity tracers in use for high-redshift galaxies. Additional modeling will be needed to resolve these uncertainties.
Appenzeller Immo
de Mello Duilia
Heckman Timothy M.
Mehlert D"orte
Noll Stefan
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