Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt.........2m&link_type=abstract
PhD Thesis, Naturwissenschaftlich-Mathematische Gesamtfakultät der Universität Heidelberg, Germany. 111 pp. (2002)
Other
8
Emission-Line Galaxies, Metal-Poor Galaxies, Surveys
Scientific paper
In this thesis, metal poor galaxies at 0.4 < z < 0.7 and Ly-α 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 [O III]λ5007 / [O II]λ3727 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-α 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-α candidates, the emission line detected in the Fabry-Perot has been verified spectroscopically. The comparison of number counts of Ly-α galaxies from CADIS with those of other Ly-α surveys at z > 3, and with model predictions, indicates that bright Ly-α galaxies are so rare beyond z = 5 that a non-evolving population can be excluded.
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