Faculties of University Bonn: Search
Now showing items 11-20 of 75
Spiral Galaxies with Thick Box/Peanut Bulges
(2003)
The close connection between bars and box/peanut-shaped bulges is observationally and theoretically supported. However, for the class of thick box/peanut-shaped bulges an environmental hypothesis instead of an internal ...
Asymmetries of Radio Galaxies
(2003)
In this work, we have studied the asymmetries of radio galaxies which are known to be related to the jet-asymmetry. They are the depolarization asymmetry and the spectral index asymmetry.
The first part of the thesis ...
The first part of the thesis ...
Theoretical Aspects of Cosmic Shear and its Ability to constrain Cosmological Parameters
(2009-03-13)
In the last decade weak gravitational lensing by the large-scale structure of the Universe, also called cosmic shear, has become an important tool to constrain cosmological parameters. Despite this success there remain ...
Environment and Properties of Submillimeter Galaxies
(2009-03-06)
Extra-galactic surveys with large submillimeter bolometer cameras discovered a population of dust obscured starbursting galaxies at high redshifts. These submillimeter galaxies (SMGs) are crucial in the stellar build up ...
Studying Galaxy-Galaxy Lensing and Higher-Order Galaxy-Mass Correlations Using the Halo Model
(2009-06-22)
In recent years, the distribution of galaxies in the Universe could be measured up to large distances and over a significant part of the sky. The analysis of this large-scale structure contains a wealth of cosmological ...
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 ...
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 ...
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 ...