{"id":{"repo_id":"heid-diss","oai_identifier":"oai:archiv.ub.uni-heidelberg.de:3115"},"canonical_url":"https://search.dev.ndltd.org/etd/heid-diss/oai:archiv.ub.uni-heidelberg.de:3115","repository":{"repo_id":"heid-diss","name":"Universität Heidelberg","base_url":"http://archiv.ub.uni-heidelberg.de/volltextserver/cgi/oai2"},"display":{"title":"The FORS Deep Field Spectroscopic Survey","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Noll, Stefan"],"institution":"Universität Heidelberg","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Appenzeller, Immo"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2002,"date_issued":"2002-12-18","date_published":"2002-12-18","updated_at":"2026-07-24T02:29:25Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://www.ub.uni-heidelberg.de/archiv/3115","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Appenzeller, Immo"]},{"key":"dc:creator","label":"Author","values":["Noll, Stefan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["Universitätsbibliothek Heidelberg"]},{"key":"dc:type","label":"Dc Type","values":["doctoralThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Universität Heidelberg"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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.","Die Bestimmung der Eigenschaften von Galaxienpopulationen bei verschiedenen Rotverschiebungen ergibt wichtige Einschränkungen für die aktuellen Modelle zur Entstehung und Entwicklung von Galaxien. Um diesen Evolutionsprozess systematisch untersuchen zu können, wurden 265 Galaxienspektren mit hohen S/N bei Rotverschiebungen bis zu 5.0 gewonnen. Die Galaxien wurden aus dem photometrischen Rotverschiebungskatalog des FORS Deep Fields (FDF) ausgewählt. Für eine optimale Reduktion der Spektren von sehr schwachen Objekten wurden Programmpakete entwickelt. Rotverschiebungen und grobe spektrale Typen wurde mit Hilfe einer Bibliothek empirischer SEDs bestimmt, die aus gemittelten FDF-Spektren mit sehr hohem S/N abgeleitet wurden. Die Charakteristiken der beobachteten Galaxienspektren werden präsentiert und die Verteilung der Rotverschiebungen und spektralen Typen diskutiert. Erste Analysen des exzellenten Datensatzes wurden mit Hilfe von gemittelten Spektren für Galaxien-Ensembles verschiedener Rotverschiebung und Messungen von Linienstärken in den individuellen Galaxienspektren durchgeführt. Die Resultate zeigen bei höheren Rotverschiebungen eine größere Steigung des UV-Kontinuums, eine Verstärkung des Lya-Waldes, einen Anstieg der Häufigkeit und Stärke der Lya-Emission und eine Verringerung der CIV-Absorption. Die Entwicklung von CIV wird mit der Veränderung der mittleren Metallizität erklärt."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The FORS Deep Field Spectroscopic Survey","Die spektroskopische Durchmusterung des FORS Deep Fields"]}]}],"canonical_facts":{"dc:contributor":["Appenzeller, Immo"],"dc:creator":["Noll, Stefan"],"dc:description.abstract":["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.","Die Bestimmung der Eigenschaften von Galaxienpopulationen bei verschiedenen Rotverschiebungen ergibt wichtige Einschränkungen für die aktuellen Modelle zur Entstehung und Entwicklung von Galaxien. Um diesen Evolutionsprozess systematisch untersuchen zu können, wurden 265 Galaxienspektren mit hohen S/N bei Rotverschiebungen bis zu 5.0 gewonnen. Die Galaxien wurden aus dem photometrischen Rotverschiebungskatalog des FORS Deep Fields (FDF) ausgewählt. Für eine optimale Reduktion der Spektren von sehr schwachen Objekten wurden Programmpakete entwickelt. Rotverschiebungen und grobe spektrale Typen wurde mit Hilfe einer Bibliothek empirischer SEDs bestimmt, die aus gemittelten FDF-Spektren mit sehr hohem S/N abgeleitet wurden. Die Charakteristiken der beobachteten Galaxienspektren werden präsentiert und die Verteilung der Rotverschiebungen und spektralen Typen diskutiert. Erste Analysen des exzellenten Datensatzes wurden mit Hilfe von gemittelten Spektren für Galaxien-Ensembles verschiedener Rotverschiebung und Messungen von Linienstärken in den individuellen Galaxienspektren durchgeführt. Die Resultate zeigen bei höheren Rotverschiebungen eine größere Steigung des UV-Kontinuums, eine Verstärkung des Lya-Waldes, einen Anstieg der Häufigkeit und Stärke der Lya-Emission und eine Verringerung der CIV-Absorption. Die Entwicklung von CIV wird mit der Veränderung der mittleren Metallizität erklärt."],"dc:format.medium":["application/pdf"],"dc:publisher":["Universitätsbibliothek Heidelberg"],"dc:title":["The FORS Deep Field Spectroscopic Survey","Die spektroskopische Durchmusterung des FORS Deep Fields"],"dc:type":["doctoralThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Universität Heidelberg"]},"updated_at":"2026-07-24T02:29:25Z"}