E-Dissertationen: Suche
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Jet-Reorientation in X-shaped Radio Galaxies
(2002)
The thesis set out to investigate the nature and genesis of the peculiar class of X-shaped radio galaxies. X-shaped sources are puzzling because of the extremely low number of objects of that type. Three scenarios were ...
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 ...
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 ...
The cloudy HI halo of the Milky Way
(2008)
Based on the analysis of the Milky Way soft X-ray background and all sky 21-cm line surveys models show that the gaseous Galactic Halo has two components, one of hot plasma with log[T(K)]=6 and a neutral component. If ...
Die Suche nach hochdispergierten Radio-Pulsaren in Richtung des Galaktischen Zentrums
(2005)
Obwohl bis zum heutigen Tage mehr als 1500 Radio-Pulsare in unserer Galaxie entdeckt wurden, konnte bislang nicht ein einziger Pulsar im direkten Umfeld des Galaktischen Zentrums gefunden werden. Dies ist um so mehr ...
Variability of radio and TeV emitting X-ray binary systems: The case of LS I +61°303
(2013-09-09)
X-ray binaries contain a compact object, a black hole or a neutron star, and a normal companion star. An exclusive club of only ∼5 sources, also emits in radio and in gamma-rays. The nature of these gamma-ray binaries is ...
A Study of Short-Spacing Correction for Galactic and Extragalactic Objects
(2015-02-11)
Radio telescopes can be divided into single-dish instruments and interferometer arrays. Their respective observational approaches are fundamentally different. Single dishes can make an accurate measurement of flux. However, ...
Investigating astrophysical plasmas with pulsars using LOFAR and other telescopes
(2015-02-19)
Pulsars are rapidly-rotating, highly-magnetised neutron stars that produce radio emission in their magnetospheres, which is detected as pulses on Earth. The focus of this thesis is observing pulsars as the means to study ...
The APEX southern sky survey of high mass star forming regions
(2009-03-30)
During my dissertation work, I studied the early stages of massive star formation in the southern hemisphere, using sub-mm line and continuum data. A sample of 47 sources, chosen according to IRAS color selection criteria, ...
The Physical Properties of Intermediate-Velocity Gas at High Galactic Latitudes
(2016-07-26)
The accretion of matter onto galactic disks, the formation of molecular clouds, and the formation of stars are of major importance for the evolution of galaxies over cosmic times. During their lifetimes, high-mass stars ...