E-Dissertationen: Search
Now showing items 1-10 of 12
The Physics and Chemistry of Oxygen-rich Circumstellar Envelopes as Traced by Simple Molecules
(2018-04-17)
The physics and chemistry of the circumstellar envelopes (CSEs) of evolved stars are not fully understood despite decades of research. This thesis addresses two issues in the study of the CSEs of oxygen-rich (O-rich) evolved ......
The redshift distribution and dust properties of dusty star-forming galaxies at high redshift
(2018-03-27)
Millimeter (mm) and submillimeter (submm) continuum observations brought about a radical shift with the discovery that luminous, dusty galaxies were a thousand times more abundant in the early Universe than they are at ...
Searching for Pulsars in Unassociated Fermi-LAT sources
(2018-05-22)
Pulsars have always been under the γ-ray spotlight since the birth of γ-ray astronomy. They were the first sources that were firmly established as γ-ray sources in the 70s. Since then, pulsars have been the prime suspect ...
The large-scale structure of the Universe; environmental effects and relativistic corrections
(2018-12-13)
Over the cosmic age gravity has formed the structures in the universe where galaxies are part of. We study here the effect of the environmet on the formation of dark-matter haloes and find that the growth can be quenched. ...
Ionized and Photodissociation Regions toward a New Sample of Massive Star-forming Clumps
(2018-07-16)
HII regions are an excellent indicator of high-mass star-forming regions and ongoing star formation in galaxies. Powerful outflows from O/B stars in their early stages and, during their whole life, intense UV radiation and ...
Innovative Pulsar Searching Techniques: or Fantastic Pulsars and How to Find Them
(2018-06-14)
Pulsars are rapidly rotating, highly magnetised neutron stars which emit beams of electromagnetic radiation from their magnetic poles, most commonly in the radio spectrum. These massive and extremely compact objects have ...
Binary star population synthesis: Progenitors of gravitational wave driven mergers
(2018-06-13)
The vast majority of all massive stars are born in binaries. The binarity of a star may influence its life drastically via a large variety of interactions with its companion star. Several astrophysical events, like the ...
X-Ray Studies of Galaxy Clusters and Groups: Gas Properties in the Exceptional Cases of Faint Outskirts, High Redshift and a Merging Event
(2018-01-26)
The history and evolution of the universe, the understanding of the formation of structures and the investigation of a wealth of astrophysical phenomena are the topical subjects in present-day galaxy cluster physics and ......
The impact of tides and mass transfer on the evolution of metal-poor massive binary stars
(2018-05-24)
Stars more massive than 10Msun , although few in number compared to objects like our sun, play a very large role in the evolution of the universe. Through strong winds and supernovae they enrich the interstellar medium ...
Evolution of carbon-enhanced metal-poor stars originating from mass transfer in stellar binaries
(2018-03-26)
As the hydrogen and helium created shortly after the Big Bang is gradually processed into heavier elements by successive generations of stars, the overall metal content of the Universe increases. Metal-poor stars which, ...