E-Dissertationen: Suche
Anzeige der Dokumente 211-220 von 236
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, ...
Terahertz Airborne Astronomy using a Four Detector High Resolution Spectrometer: 4GREAT
(2018-12-12)
After the Herschel Space Telescope ceased operations in 2013, the astronomical community has been lacking access to those parts of the terahertz spectrum that are not visible from ground-based observatories. The atmosphere ...
Mass calibration of the Sunyaev-Zel'dovich effect using APEX-SZ galaxy clusters
(2018-12-14)
Clusters of galaxies are the most massive, gravitationally bound structures in the Universe. Their abundance across cosmic time and space is sensitive to cosmological parameters. Of particular interest to modern cosmology ...
The evolution of massive stars in the Small Magellanic Cloud
(2019-03-27)
Massive stars in the early universe are born with only a small amount of heavy elements (or, 'metals’). These metal-poor massive stars played a crucial role in shaping the galaxies in the early universe. They are also the ...
Small-scale Physical and Chemical Structure of Diffuse and Translucent Molecular Clouds along the Line of Sight to the Galactic Center
(2019-05-02)
Diffuse and translucent molecular clouds constitute a large part of the molecular interstellar medium (ISM) in our Galaxy as well as in other spiral galaxies. In particular, the envelopes of giant molecular clouds (GMCs), ...
Massive filamentary clouds and their role in star formation
(2019-05-27)
Filamentary structures are ubiquitous in the interstellar medium of the Milky Way. They are observed at a large range of size-scales from ~ 1 pc within star-forming and quiescent molecular clouds to ~ 100 pc representing ...
Deep, Large Scale Surveys of Star Forming Regions throughout the Milky Way
(2019-02-04)
Star formation and the processes involved are not only important to the Milky Way as an astronomical object, but are also crucial to understand our own origin. For instance, only lower-mass stars like our own Sun have ...
Enabling wide-field, high-spatial-resolution fast transient searches on modern interferometry
(2022-04-13)
Fast transients reveal the energetic universe to us. They are usually the products of rapid and enormous energy releases. To study the physical nature behind them, we must know the subtle temporal structure of the signal ...
GLOSTAR: Investigating Tracers of Early High-Mass Star Formation
(2023-05-12)
High-mass stars (>8 msol) are not as numerous as their less massive counterparts but have a much more profound impact on their environment within their native galaxies. Despite their importance, our understanding of their ...
Density split statistic in cosmic shear surveys: Generalisations and its application to the Kilo Degree Survey
(2023-03-24)
Understanding the formation and evolution of the Universe’s large-scale structure are fundamental in modern cosmology. Currently, the most accurate model to describe the LSS and other observations like the cosmic microwave ......