Exploring galaxy evolution at high redshift

Details Exploring galaxy evolution at high redshift Exploring galaxy evolution at high redshift

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p..53n&link_type=abstract

Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.

Astronomy and Astrophysics

Astrophysics

Scientific paper

Using the FORS instrument at the ESO VLT we obtained low-resolution spectra of the galaxy population in the FORS Deep Field. 98 out of 341 objects with reliable spectroscopic redshifts are starburst galaxies and QSOs at 2 < z < 5. Using this data set we investigated the evolution of the characteristic spectral properties of bright starburst galaxies and their mutual relations as a function of redshift. Significant evolutionary effects were found for 2 < z < 4. Most conspicuous are the increase of the average C IV absorption strength, of the dust reddening, and of the intrinsic UV luminosity, and the decrease of the average Lyα emission strength with decreasing redshift. In part, the observed evolutionary effects can be attributed to an increase of the metallicity of the galaxies with cosmic age. Moreover, the increase of the total star-formation rates and the stronger obscuration of the young stellar population by dusty gas clouds suggest the occurrence of more massive starbursts at later cosmic epochs.

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