Evidence for chemical evolution in spectra of high redshift galaxies

Details Evidence for chemical evolution in spectra of high redshift galaxies Evidence for chemical evolution in spectra of high redshift galaxies

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ap%26ss.284..437m&link_type=abstract

Astrophysics and Space Science, v. 284, Issue 2, p. 437-442 (2003).

Astronomy and Astrophysics

Astrophysics

2

Galaxy Evolution, Stellar Content

Scientific paper

Using a sample of 57 VLT FORS spectra in the redshift range 1.37< z < 3.40 and a comparison sample with 36 IUE spectra of local (z ≈ {text{0}}) starburst galaxies we derive CIV equivalent width values and estimate metallicities of starburst galaxies as a function of redshift. Assuming that a calibration of the CIV 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 &sun; at the cosmic epoch corresponding to z ≈ 3.2 to about 0.42 Z &sun; at z ≈ 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 given metallicity.

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