Gas and star formation in galaxies are intimately linked to one another. Molecular hydrogen gas is the material out of which stars form, while the process of forming stars, in turn, depletes the reservoirs of gas in galaxies and builds up their stellar mass. Observations of star…
"11" Result
Sort By:
This thesis reports the isotopic compositions of different elements in a large number of presolar SiC and oxide grains in order to further increase our knowledge of nucleosynthesis in asymptotic giant branch (AGB) stars, the chemical evolution of the galaxy, and the lifetimes of…
The outskirts of galaxies like the Milky Way (MW) are important testing grounds for our understanding of galaxy formation and evolution. Models and observations agree that their vast accreted halos, while incredibly faint and difficult to observe, tantalizingly encode the proper…
Within LCDM, galaxies are regulated by both large-scale processes such as mergers, tidal torques and smooth accretion via filaments, as well as by small-scale processes such as star formation and feedback. These mechanisms leave characteristic signatures imprinted in the stellar…
In this thesis, we aim to understand the history of active galactic nuclei (AGN). AGN typically are observed while the central black hole is actively accreting. While these are essential measurements, they do not allow us to examine a host galaxy after the active phase has compl…
Understanding how galaxies form and evolve is a fundamental goal of modern astrophysics. It touches on critical problems at both small scales, e.g., star-formation, and large scales, e.g., the hierarchical growth of structure as expected from the cosmological paradigm. Ironicall…
The reionization of intergalactic hydrogen contains important clues to the history of cosmic structure formation. Galaxies in the reionization-era are found to present prominent rest-frame optical emission lines, as expected for galaxies experiencing rapidly rising star formatio…
One of the main issues in astrophysics is to understand how galaxies form and evolve. Deep photometric studies help the investigation of the evolution of resolved stellar contents of nearby systems. Hence the properties of these regions represent an archaeological record of the …
Modern models predict that galaxies do not evolve in isolation, but exist in haloes of dark matter and gas, embedded in the large-scale "cosmic web". To build a self-consistent model for how galaxies form and evolve, it is vital to understand how galaxies regulate their formatio…
Within our Galactic backyard, the Magellanic System, composed of the Large and Small Magellanic Clouds, is exchanging millions to billions of solar masses worth of material to the Milky Way. In two different studies, we explored this exchange and its impact on the Galactic envir…
This is a dissertation in six chapters, where we aim to obtain a better understanding of the most luminous source populations at the peak epoch of cosmic star formation rate density using observational data collected with state-of-the-art facilities. Previous studies report star…