The Faculty of Mathematics and Natural Sciences: Search
Now showing items 1-10 of 14
Dynamical Studies of the Globular Cluster Systems around the Giant Elliptical Galaxies NGC4636 and NGC1399
(2011-08-02)
Dark matter studies in elliptical galaxies were long hampered by the lack of suitable dynamical tracers. The advent of 8 m-class telescopes equipped with multi-object spectrographs has made it possible to use globular ...
A Detailed Study of Galaxy Clusters with Weak Gravitational Lensing and X-rays
(2012-07-17)
Galaxy clusters represent the top of hierarchical structure formation with the largest dark matter halos. Their abundance with respect to mass and redshift can be used to constrain cosmological parameters. The most extensive ...
Weak gravitational lensing analyses of clusters of galaxies
(2011-04-04)
Comprising the most massive gravitationally bound and relaxed structures in the Universe, galaxy clusters are essential in providing a deeper understanding of the properties of dark matter. Being cosmologically young ...
Weak Lensing Mass Determination of Eight X-ray Selected Galaxy Clusters from the 400d Survey
(2011-01-19)
Evolution in the mass function of galaxy clusters sensitively traces both the expansion history of the Universe and cosmological structure formation. Hence, measuring the number density of galaxy clusters as a function of ...
Observations of the Sunyaev-Zel'dovich Effect towards Clusters of Galaxies with the APEX Telescope
(2009-09-14)
Results of 150 GHz continuum observations of several X-ray bright clusters of galaxies in the Sunyaev-Zel'dovich (SZ) effect, carried out using the APEX-SZ bolometer array on the APEX telescope, are presented. Follow-up ...
Combined Weak Lensing and X-Ray Search for Galaxy Clusters and the Filaments Connecting Them
(2006)
The work presented here has four main parts.
(1) A newly developed, almost fully automated data reduction pipeline for optical single- and multi-chip CCD cameras is described. Its image products are compared to those ...
(1) A newly developed, almost fully automated data reduction pipeline for optical single- and multi-chip CCD cameras is described. Its image products are compared to those ...
Exploring Dark Matter Properties from the Smallest to the Largest Scales
(2004)
One of the main problems in cosmology is to understand the formation and evolution of galaxies, galaxy clusters, and large-scale structure. Whereas the basics of the current Cold Dark Matter (CDM) paradigm for structure ...
Weak lensing measurements for the APEX-SZ cluster survey
(2014-12-02)
The formation of structures in the universe, such as galaxy clusters, depends sensitively on cosmological parameters. Measuring the abundance of clusters as a function of mass and redshift therefore yields a way to constrain ...
Structure in galaxy clusters revealed through Sunyaev-Zel’dovich observations: A multi-aperture synthesis approach
(2014-12-02)
As the largest bound objects in the universe, galaxy clusters are unique targets to study astrophysical processes, as well as powerful probes for precision cosmology. Galaxy clusters are dynamically young and their merger ...
Optical confirmation and weak lensing mass constraints for distant Sunyaev-Zel'dovich-detected galaxy clusters
(2022-03-28)
Galaxy clusters reside in the densest regions of the large-scale matter distribution of the Universe. Therefore, their number density as a function of mass and redshift is a powerful tool for cosmological studies aiming, ...