E-Dissertationen: Search
Now showing items 1-9 of 9
VLBI Observations of Two Prototypical AGN: The BL Lac Object S5 0716+714 and the FR II Radio Galaxy Cygnus A
(2004)
This work will summarise recent results from VLBI observations of two radio sources that are the most representatives of their AGN class: the BL Lac object 0716+714 and the FRII radio galaxy Cygnus A. Both are important ...
Gas Around Active Galactic Nuclei and New Phase Calibration Strategies for High-Frequency VLBI
(2004)
We have a project to measure magnetic fields in the obscuring tori of AGNs. We observed five free-free absorbed jets in radio galaxies with polarimetric VLBI at 15 GHz to determine Faraday rotation measures. Surprisingly, ...
Measurement of the Strangeness Spectral Function and the Mass of the Strange Quark in Hadronic τ Decays with the Opal Detector
(2004)
Tau lepton decays with open strangeness in the final state are measured with the OPAL detector at LEP to determine the strange hadronic spectral function of the t lepton and the mass of the strange quark. The decays ...
Weak gravitational lensing: Detection of mass concentrations in wide field imaging data
(2004)
The deflection and distortion of a light bundle by tidal gravitational fields is described in the framework of General Relativity. There, light bundles from a source follow exactly the curvature of spacetime, and are ...
Proper Motions in the Local Group
(2004)
In this thesis, the proper motions of two Local Group galaxies, namely M33 and IC10. The proper motions were measured by phase-referencing Very Long Baseline Interferometry (VLBI) observations of water vapour masers in the ...
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 ...