Mathematisch-Naturwissenschaftliche Fakultät: Suche
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Measuring cosmological weak lensing using the Advanced Camera for Surveys on board the Hubble Space Telescope
(2008)
Following from the theory of General Relativity, light-bundles are deflected and differentially distorted while passing through the gravitational potential of matter inhomogeneities. The gravitational lensing effect caused ...
Thermal and Nonthermal Emission from the Nearby Galaxy M33: A Multi-Scale Study of Infrared and Radio Emission
(2008)
A multi-wavelength study of radio and IR emission from the nearby galaxy M33 is presented. We focus on three main topics: 1) energy sources of IR emission and its correlation with radio continuum emission at different ...
Clumpy Dust Tori in Active Galactic Nuclei
(2008)
Active Galactic Nuclei (AGN) are amongst the most luminous objects in the universe. The source of their activity is accretion onto a supermassive black hole in the center of the galactic nucleus. The various phenomena ...
Properties of the Molecular Gas in Low Metallicity Environments
(2007)
Understanding star formation is of great importance in modern astrophysics because it gives us crucial information on the way galaxies evolve and therefore provides important insights into the evolution and nature of our ...
A Global 86 GHz VLBI Survey of Compact Radio Sources
(2007)
We present results from a large global VLBI survey of compact radio sources at 86 GHz. The main goal of the survey is to increase the total number of objects accessible for future 3-mm VLBI imaging by factors of 3-5.
Superconducting bolometers for millimeter and submillimeter wave astronomy
(2007)
Bolometers are simple and robust incoherent continuum detectors which nevertheless can reach sensitivities close to the fundamental noise limit. This thesis describes the theory, design, fabrication and testing of the ...
Application of photometric redshifts on the correlation properties of galaxies and matter
(2007)
In the past years cosmology, the science of the universe as a whole, has seen tremendous progress. The Lambda-Cold-Dark-Matter scenario is widely accepted as the standard model of cosmology describing the evolution of the ...
Infrared Spectro-Interferometry of Massive Stars: Disks, Winds, Outflows, and Stellar Multiplicity
(2007)
Interferometry is the ultimate technology for overcoming the limitations which diffraction and the atmosphere-induced seeing impose on the resolution achievable with ground-based telescopes. The latest generation of ...
The State and Evolution of Isolated Dense Molecular Cores
(2007)
This work presents studies of nearby (< 500 pc) dense molecular cloud cores, the sites of low-mass star formation. The sample includes starless and protostellar cores and allows to compare their properties in a homogenous ...
Early Nucleosynthesis Studies with Quasar Absorption Line Spectroscopy
(2007)
Studying the light of celestial objects in different wavelengths is a fundamental approach and very common in astronomy, where large ground based telescopes and sophisticated high-resolution spectrographs became recently ...