The Faculty of Mathematics and Natural Sciences: Search
Now showing items 1-10 of 17
Statistical Analyses of Massive Stars and Stellar Populations
(2015-03-04)
Massive stars, i.e. stars more massive than about ten times that of the Sun, are key agents in the Universe. They synthesise many of the chemical elements that are so important for life on Earth, helped reionising the early ...
Resolving the inner circumstellar disks of T Tauri and Herbig Ae/Be stars with infrared interferometry
(2015-03-20)
Circumstellar disks around young stellar objects (YSO) are a fundamental element of star and planet formation. The inner disk regions of pre-main sequence stars are hot enough for dust sublimation and a rim between dust-free ...
Nearby Spiral Galaxies at Low Frequencies
(2015-05-15)
The low frequency regime (less that 300 MHz) of radio astronomy, while been its birthplace, has been neglected in the past several decades due to the challenges of calibration. External galaxies have hardly been observed ...
Statistical properties of cosmological correlation functions
(2015-04-24)
Correlation functions are an omnipresent tool in astrophysics, and they are routinely used to study phenomena as diverse as the large-scale structure of the Universe, time-dependent pulsar signals, and the cosmic microwave ...
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, ...
Magnetic Fields and the Formation of Aspherical Planetary Nebulae
(2015-02-19)
The general evolution of stars with initial mass between 0.8 and 8 solar masses is believed to be well understood until the last stages, when significant mass loss starts. However, an initially spherical star may evolve ...
Challenges of theoretical and numerical structure formation in a ΛCDM universe
(2015-06-22)
Systematic surveys of the extra-galactic sky have revealed the existence of large-scale structures in the Universe: the galaxy distribution is organized in a complex network of filaments surrounding underdense regions and ...
Galaxies in Milgromian Dynamics
(2015-02-04)
Since its first formulation in 1983, Milgromian dynamics (also known as modified Newtonian dynamics or MOND) has been very successful in predicting the gravitational potential of galaxies from the distribution of baryons ...
Tracing the Evolution of Local Universe Galaxies by Kinematical Studies of HI
(2015-01-14)
This work studies the neutral gas in external galaxies using the neutral atomic hydrogen (HI) line to investigate the kinematics of the gas component. This thesis consists of three parts, one part focusses on early-type ...
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 ...