title: Evolution of galaxies studied by the COMBO-17+4 survey
creator: Jäger, Mathias
subject: ddc-520
subject: 520 Astronomy and allied sciences
description: In this thesis the evolution of galaxies at redshift z < 2 was analyzed, using the COMBO-17+4 (Classifying Objects by Medium-Band Observations) survey. This survey used optical as well as near-infrared data from three different fields of view with a total area of 0.625 square degree. On the basis of an H band selected catalog the photometric  redshifts, rest-frame colors and masses of 42,134 galaxies to a limiting magnitude of H = 21.7 mag were calculated. Using the color bimodality in (U280 −V) the galaxies were divided in a red (passive) and a blue (active) population, which were analyzed separately. The results verify the existence of a bimodality up to a redshift of z = 1.6. Further the evolution of the luminosity function for both galaxy populations was analyzed in ten redshift bins. In both populations a significant decrease in the characteristic magnitude M∗B from z = 2 to z = 0.2 was measured. Moreover the number density of red galaxies showed a slight increase during this time, whereas  the number density of blue galaxies was decreasing. An analysis of the mass function showed a constant value of the characteristic mass for both populations and an  increase of the mass density for red galaxies from z = 2 to z = 0.2.
date: 2013
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/14995/1/Dissertation%20Mathias%20J%C3%A4ger%20-%20Evolution%20of%20Galaxies%20studied%20by%20the%20COMBO-17%2B4%20survey.pdf
identifier: DOI:10.11588/heidok.00014995
identifier: urn:nbn:de:bsz:16-heidok-149959
identifier:   Jäger, Mathias  (2013) Evolution of galaxies studied by the COMBO-17+4 survey.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/14995/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng