%0 Generic
%A Maier, Christian
%D 2002
%F heidok:3067
%K Galaxien-Evolution , Galaxien-Entstehung , Lyman-Alpha Emissiongalaxy formation , galaxy evolution , emission line galaxies , Lyman-Alpha emission
%R 10.11588/heidok.00003067
%T Emission Line Galaxies from CADIS : High Redshift Lyman-Alpha Galaxies and Metal Poor Galaxies at Medium Redshift
%U https://archiv.ub.uni-heidelberg.de/volltextserver/3067/
%X In this thesis,  metal poor galaxies at  0.4<z<0.7  and  Ly-alpha  galaxies at   z>4.7   have been searched for and investigated in a sample of 600 faint emission line galaxies from  four fields of the Calar Alto Deep Imaging  Survey (CADIS). Employing an imaging  Fabry-Perot interferometer, CADIS detects emission lines in three waveband windows, free of night-sky emission  lines, at 700 nm, 820 nm, and 920 nm. Metal poor galaxies at  0.4<z<0.7  have been selected  by their high [OIII]5007 / [OII]3727  ratios. Their oxygen abundances,   determined by  follow-up spectroscopy, indicate that the  metallicity-luminosity relation which applies to galaxies in the local universe  also holds at  z=0.6. Ly-alpha  galaxy candidates from the emission line sample, which contains more than 97% of objects at  z<1.2 , are selected by the absence of flux below the Lyman limit (B-band ``dropouts''), and the non-detection of secondary emission  lines in  narrow band  filters. For two Ly-alpha  candidates, the emission line  detected in the Fabry-Perot has been verified spectroscopically. The comparison of number counts of Lyman-alpha galaxies from CADIS with those of other Ly-alpha  surveys at  z>3 , and with model predictions, indicates that bright  Ly-alpha  galaxies are so rare beyond  z=5  that  a non-evolving population  can be excluded.