E-Dissertationen: Suche
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Pulsar Discoveries and their Exploitation
(2016-12-22)
Pulsars are the rapidly-rotating, highly-magnetized, neutron star remnants of the supernova explosions of massive stars. Pulsars have been used in a wide variety of studies of astronomy and physics. Of the >2500 pulsars ...
Exploring the environment of high Rotation Measure Active Galactic Nuclei through wide-band radio spectropolarimetry observations
(2016-12-21)
In this Thesis I present an observational study of a sample of radio AGN sources. I study their radio polarization properties in a wide frequency range by observing with the 100-m Effelsberg telescope and the Very Large ...
The Radio Continuum Halos of the Edge-on Galaxies NGC 891 and NGC 4565
(2016-10-13)
The halos of spiral galaxies are complex entities consisting of multiple matter components, generally including neutral and ionized gas phases, cosmic rays (CRs), dust, as well as extraplanar stars. The detection of ...
Some Aspects in Cosmological Perturbation Theory and ƒ (R) Gravity
(2016-09-08)
General Relativity, the currently accepted theory of gravity, has not been thoroughly tested on very large scales. Therefore, alternative or extended models provide a viable alternative to Einstein’s theory. In this thesis ...
Investigating Anisotropies in the Local Universe with Type Ia Supernovae from the Nearby Supernova Factory
(2015-12-10)
The dipole anisotropy of the cosmic microwave background temperature is two orders of magnitude larger than its other multipole components, which is attributed to the Doppler shift due to the motion of our Local Group of ...
Automated Source Extraction for the Next Generation of Neutral Hydrogen Surveys
(2015-12-23)
This thesis is a first step to develop the necessary tools to automatically extract and parameterize sources from future HI surveys with ASKAP, WSRT/Apertif, and SKA.
The current approach to large-scale HI surveys, ...
The current approach to large-scale HI surveys, ...
Optical Data Analysis and its Application to Cosmology
(2016-03-30)
This work is concerned with different aspects of observational cosmology. It covers a broad range of problems that one needs to deal with in optical astronomy.
Three introduction chapters about cosmology, gravitational ...
Three introduction chapters about cosmology, gravitational ...
Searches for Neutrinos from Supernovae Using Cherenkov In-Ice Detectors
(2017-05-15)
Supernovae mark the violent death of massive stars. They are among the most energetic processes known to exist in the Universe. Neutrinos play crucial roles in supernova processes. Besides the low-energy neutrinos emitted ...
Massive stars on the main sequence
(2017-03-10)
Massive stars have a strong influence on their environment by chemical enrichment of the surrounding interstellar medium due to strong stellar winds. The influence of mass loss and rotation on the main-sequence evolution ...
Cosmological Investigations On Large And Small Scales
(2017-03-03)
The standard model of cosmology, founded on Einstein’s theory of gravity and on the Cosmological Principle (CP), has been understood as being successful in providing explanations for many observations so far. However, it ...