title: Searching for Distant Galaxy Clusters : Optical Observations, Cluster Search Algorithms and the Cluster Selection Function
creator: Falter, Siegfried
subject: ddc-520
subject: 520 Astronomy and allied sciences
description: HIROCS is a multi-color survey designed to construct a statistically significant galaxy cluster sample for galaxy evolution studies using a multi-color classification scheme in the redshift range 0.5 < z < 1.5. After contributing to the survey specifications, tests of the multi-color classification with the observational setup showed the feasibility of the project. The photometric redshift accuracy of delta(z) = 0.076 was estimated at the R band limit of ~25 mag. The new algorithm for the galaxy cluster detection was developed and tested with COMBO-17 data. In the three COMBO-17 fields covering 0.78 square degrees 15 cluster candidates were identified in the redshift range 0.3 < z < 0.9. The power of the search method was demonstrated by a comparison with the cluster detections from the Voronoi tessellation. For the determination of the cluster selection function in HIROCS and COMBO-17 procedures to simulate galaxy clusters were introduced. Due to the lack of fully reduced HIROCS data, the COMBO-17 selection function was quantified; rich clusters are expected to be found in the redshift range covered by COMBO-17. First steps towards an analysis of cluster candidates were carried out using the COMBO-17 candidates. Finally, a rich cluster at redshift ~0.7 was identified in the first HIROCS infrared data.
date: 2006
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/6789/1/dissertation_SiegfriedFalter.pdf
identifier: DOI:10.11588/heidok.00006789
identifier: urn:nbn:de:bsz:16-opus-67894
identifier:   Falter, Siegfried  (2006) Searching for Distant Galaxy Clusters : Optical Observations, Cluster Search Algorithms and the Cluster Selection Function.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/6789/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng