Searching for distant galaxy clusters: optical observations, cluster search algorithms and the cluster selection function

Details Searching for distant galaxy clusters: optical observations, cluster search algorithms and the cluster selection function Searching for distant galaxy clusters: optical observations, cluster search algorithms and the cluster selection function

Publishing date

Jul 2006

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phdt.........6f&link_type=abstract

Journals

PhD Thesis, Combined Faculties for the Natural Sciences and for Mathematics of the University of Heidelberg, Germany. III+164 pp

Science

Mathematics

Additional info 2

1

Additional info 3

Galaxy Clusters, Surveys

Type

Scientific paper

Abstract

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 δz) = 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.

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