Faculties of University Bonn: Search
Now showing items 61-70 of 75
A VLBI investigation of the discrepant image flux-density ratio in the gravitational lens JVAS B0218+357
(2006)
B0218+357 is a doubly-imaged gravitational lens with the smallest known image angular separation (334 mas) amongst the galactic-scale lens systems. Besides the two compact images with flat-spectra, A and B, it has a ...
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 ...
High-Resolution Study of Selected Intraday Variable Sources
(2006)
Radio waves are affected by the ionized interstellar medium through which they pass. Wide ranges of scattering effects can occur and influence the observed characteristics of compact radio objects. Distinguishing between ...
Zur Bestimmung des cm-Geoids und dessen zeitlicher Variationen mit GRACE
(2007)
In dieser Arbeit wird eine Analysemethode unter Verwendung der dynamischen Methode zur Berechnung hochgenauer und hochauflösender Schwerefeldmodelle in Form von Kugelfunktionskoeffizienten auf der Grundlage der neuartigen ...
Methanol: a diagnostic tool for star formation
(2005)
A powerful diagnostic tool of interstellar clouds is found in the analysis of their molecular spectra, which can be seen as fingerprints of a star forming region. Since the main gas-phase molecular component, H2, ...
Radio Emission from Cosmic Ray Air Showers
(2005)
Charged particles with energies ranging from a few times 106 eV up to ≥ 1020 eV continuously impinge on the earth as so-called “cosmic rays”. Their study constitutes an important field of research in ...
Jets from X-ray Binaries to Active Galactic Nuclei
(2004)
It is generally believed that active galactic nuclei (AGN) and black hole X-ray binaries (XRBs) have a similar central engine and that they could be described with a unified model. However, up to now such a model has not ...
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 ...
The hot phase of the ISM: Investigation of the soft X-ray background
(2004)
In this thesis I present a quantitative solution of the soft X-ray radiation transfer through the Galactic interstellar medium. I focus on the Galactic Halo emission because its intensity distribution is thought to trace ...
Simultaneous multichannel photometry with BUSCA
(2004)
This thesis deals with the multicolour simultaneous camera BUSCA (Bonn University Simultaneous CAmera), which was build at the Sternwarte of the University of Bonn for the the 2.2m telescope at the Calar Alto Observatory ...