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Full-Text Articles in Astrophysics and Astronomy
Probing Galaxy Evolution Through Deep Radio Continuum Observations, Hansung Gim
Probing Galaxy Evolution Through Deep Radio Continuum Observations, Hansung Gim
Doctoral Dissertations
One of the most important questions in modern astrophysics is how galaxies form and evolve. There are numerous processes involved in galaxy evolution, but the stellar mass buildup and supermassive black hole growth are two main drivers in galaxy evolution. Those activities are heavily obscured by dust, so we need another tracer without dust attenuation: low-frequency radio continuum observation. We understand the galaxy evolution through the deep radio continuum observations on the Great Observatories Origins Deep Survey (GOODS)-North, -South, and the COSMOS HI Large Extragalactic Survey (CHILES) fields. Exploiting the multi-wavelength dataset, we define the radio populations such as star-formation …
Alpha Radiation Studies And Related Backgrounds In The Darkside-50 Detector, Alissa Monte
Alpha Radiation Studies And Related Backgrounds In The Darkside-50 Detector, Alissa Monte
Doctoral Dissertations
DarkSide-50 is the current phase of the DarkSide direct dark matter search program, operating underground at the Laboratori Nazionali del Gran Sasso in Italy. The detector is a dual-phase argon Time Projection Chamber (TPC), designed for direct detection of Weakly Interacting Massive Particles (WIMPs), and housed within a veto system of liquid scintillator and water Cherenkov detectors. Since switching to a target of low radioactivity argon extracted from underground sources in April 2015, the background is no longer dominated by naturally occurring 39Ar. However, alpha backgrounds from radon and its daughters remain, both from the liquid argon bulk and internal …
The Clustering Of Young Stellar Clusters In Nearby Galaxies, Kathryn Grasha
The Clustering Of Young Stellar Clusters In Nearby Galaxies, Kathryn Grasha
Doctoral Dissertations
Star clusters form the basic building blocks of galaxies. They span a wide range of ages, from a few million years to billions of years, making them exceptional tracers of the star formation histories of their host galaxies. Star formation is the process by which galaxies build up their stellar populations and their visible mass and occurs in a continuous, hierarchical "social" fashion across a large dynamical range, from individual stars up to kiloparsec-scale ensembles of stellar aggregates. It is the formation, evolution, and eventual destruction of these large hierarchical star-forming complexes that provide an essential role in understanding the …