Journal
ASTRONOMY & ASTROPHYSICS
Volume 393, Issue 3, Pages 809-819Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20021052
Keywords
galaxies : starburst; galaxies : evolution; galaxies : formation; galaxies : stellar content; galaxies : fundamental parameters
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Using a sample of 57 VLT FORS spectra in the redshift range 1.37 < z < 3.40 (selected mainly from the FORS Deep Field survey) and a comparison sample with 36 IUE spectra of local (z approximate to 0) starburst galaxies we derive C and Si equivalent width values and estimate metallicities of starburst galaxies as a function of redshift. Assuming that a calibration of the C equivalent widths in terms of the metallicity based on the local sample of starburst galaxies is applicable to high-z objects, we find a significant increase of the average metallicities from about 0.16 Z(.) at the cosmic epoch corresponding to z approximate to 3.2 to about 0.42 Z(.) at z approximate to 2.3. A significant further increase in metallicity during later epochs cannot be detected in our data. Compared to the local starburst galaxies our high-redshift objects tend to be overluminous for a fixed metallicity. Our observational results are in good agreement with published observational data by other authors and with theoretical predictions of the cosmic chemical evolution.
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