TY  - GEN
AV  - public
TI  - The FORS Deep Field Spectroscopic Survey
Y1  - 2002///
ID  - heidok3115
KW  - Tiefes Feld 
KW  -  FORS 
KW  -  Galaxienevolution 
KW  -  Metallizität 
KW  -  Lyman alpha 
KW  -  hochrotverschobene Galaxie 
KW  -  Galaxienverteilungdeep field 
KW  -  FORS 
KW  -  VLT 
KW  -  optical spectroscopy 
KW  -  redshift 
KW  -  spectral type 
KW  -  galaxy evolution 
KW  -  metallicity 
KW  -  Lyman alpha 
KW  -  high-redshift galaxy
A1  - Noll, Stefan
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/3115/
N2  - The determination of the properties of galaxy populations at different redshifts provides important constraints on current models of galaxy  formation and evolution. In order to investigate this evolutionary process  systematically, we obtained high S/N spectra for 265 galaxies at redshifts  up to 5.0 with the FORS instruments at the VLT telescopes. The galaxies were selected from the photometric redshift catalogue of the FORS Deep Field (FDF). To achieve an optimal reduction of the spectra of these very faint objects special reduction packages were developed. Redshifts and rough  spectral types were determined using a library of empirical SEDs derived from  FDF mean spectra with very high S/N. The characteristics of the observed  galaxy spectra are presented and the distribution of redshifts and spectral  types are discussed. A first analysis of the excellent data set was carried  out using mean spectra of redshift-selected galaxy subsamples and line  strength measurements in individual galaxy spectra. The results show a  steeper UV continuum, an increase of the Lya forest, an increase of the  frequency and strength of Lya emission and a decrease of the CIV  absorption towards higher redshifts. The CIV evolution is explained by a  change of the average metallicity.
ER  -