E-Dissertationen: Search
Now showing items 41-50 of 236
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 ...
Ray-Tracing Simulations of Weak Gravitational Lensing
(2009-07-02)
Weak gravitational lensing, i.e. the distortion of images of distant galaxies due to the deflection of light rays in gravitational fields, is a powerful method to study the matter distribution in the Universe. It can be ...
Variability studies of a sample of IntraDay Variable sources
(2009-07-07)
The discovery of IntraDay Variability (IDV) in the radio flux from Active Galactic Nuclei gave rise to a series of fundamental issues concerning the origin of the variability. The observation of large flux-density variations ...
Cosmic Shear and the Intrinsic Alignment of Galaxies
(2010-11-12)
Cosmology has recently entered an era of increasingly rich observational data sets, all being in agreement with a cosmological standard model that features only a small number of free parameters. One of the most powerful ...
Novel Search Techniques to Detect Pulsar Black Hole Binaries in Radio Observations
(2022-02-21)
Pulsars are rapidly rotating highly magnetised neutron stars that emit beams of electromagnetic radiation from their magnetic poles. These compact objects are unique as they are one of the densest forms of matter known in ...
New aspects of star cluster physics
(2010-07-22)
Star clusters are the birth-sites of both low- and high-mass stars and can be considered to be the building blocks of galaxies. Therefore, the understanding of the formation, evolution, and death of star clusters is of ...
Flux Density and VLBI Measurements of the IDV Source 0917+624
(2010-03-29)
Extragalactic compact flat spectrum radio sources are known to be highly variable and about 30% of them show intra-day variability (IDV). The quasar 0917+624 was known to show prominent IDV behaviour from the time it was ...
The Effelsberg-Bonn HI Survey
(2009-02-25)
Since Summer 2008 a new L-band 7-Feed-Array is operated for astronomical science at the 100-m radio telescope at Effelsberg. This receiver will be used to perform an unbiased, fully sampled HI survey of the whole northern ...
From galaxies to the cosmic web and back: the interplay of different scales in galaxy formation and cosmic reionization
(2020-10-08)
The evolution of the Universe is primarily governed by gravity, that triggers the development of a complex web-like distribution of galaxies. The latter are embedded in larger structures, called haloes, mainly composed by ...
A Tale of Two Wide Separation Gravitational Lenses
(2008)
Wide separation gravitational lens systems are good candidates to probe the matter (luminous+dark) distribution in massive halos. Investigation of two wide separation lens systems is carried out. MG 2016+112 is a quadruply ...