Mathematisch-Naturwissenschaftliche Fakultät: Suche
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Studying large-scale structures and polarization of the Northern sky facilitating single-station data of the Low Frequency Array (LOFAR)
(2016-07-21)
All-sky surveys help to gather a deep knowledge about the nature of large-scale structures in the Universe, the Milky Way and extragalactic galaxies. In the context of that, observations in the radio domain are important, ...
Kinematics study of M81 and M82 Galaxies
(2016-12-21)
The measurement of proper motion combined with the radial velocities, is an important tool for our understanding of the dynamics and evolution of galaxies in a group environment. One of the nearest group is the M$,$81 group ...
Probing Gravity with High-Precision Pulsar Timing
(2016-12-22)
Pulsars are highly magnetised neutron stars which spin tremendously fast, at periods that are as low as a few milliseconds. Chapter 1 gives an overview of their basic observational properties and applications. Pulsars are ...
Instabilities in the envelope of stars
(2016-12-22)
Stars shine, id est they release energy from their surfaces. This energy is mostly provided by thermonuclear fusion in their cores, and has thus to be transported through the whole star. Especially in the low density outer ...
Envelope inflation in massive stars near the Eddington limit
(2016-12-21)
Massive stars, i.e. those stars with masses more than about 10 times that of the Sun, are important agents for the chemical and dynamical evolution of galaxies. Because of the steep mass-luminosity relation, massive stars ...
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 ...
Deep radio continuum study of NGC 4631 and its Faraday tomography
(2016-11-29)
NGC4631 is a nearby edge-on spiral galaxy with a spectacular radio halo, one of the largest observed among edge-on galaxies. This makes the galaxy an ideal target to study the properties of synchrotron halos, the propagation ...
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 ...