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Full-Text Articles in External Galaxies
A Multi-Frequency Investigation Of Compact Symmetric Objects, Evan E. Sheldahl
A Multi-Frequency Investigation Of Compact Symmetric Objects, Evan E. Sheldahl
Physics & Astronomy ETDs
Some of the brightest objects in the radio sky are jetted active galactic nuclei (AGN), supermassive black holes in the centers of galaxies that accelerate relativistic electrons into twin radio jets. One of the biggest questions surrounding AGN is how they produce radio jets in the first place. We search for an answer to this question by exploring a class of AGN that have uniquely well-constrained physical properties and are thought to be in an early stage of AGN development: compact symmetric objects (CSOs). Throughout our journey with these remarkable sources, we quantify their efficacy as calibrator sources for radio …
Searching For Supermassive Binary Black Holes And Their Gravitational Waves, Karishma Bansal
Searching For Supermassive Binary Black Holes And Their Gravitational Waves, Karishma Bansal
Physics & Astronomy ETDs
The recent discovery of gravitational waves (GWs) by the LIGO collaboration has opened a new observing window on the universe, but it is limited to the GWs in the frequency range of 10-1000 Hz. The main motivation of this thesis is to consider the possibility of detecting low frequency (nHz) GWs. In the pursuit of these waves, we need to understand their source of origin and build a detector with the required sensitivity. Low-frequency waves are expected as a result of coalescing binary supermassive black holes (SMBBHs). We hope to detect these waves in the near future using pulsar timing …
Molecular Tracers Of Star Formation Feedback In Nearby Galaxies, Mark Gorski
Molecular Tracers Of Star Formation Feedback In Nearby Galaxies, Mark Gorski
Physics & Astronomy ETDs
The energy and momentum injected into the ISM from stars has a drastic effect on the star formation history of a galaxy. This is called feedback. It is responsible for the inefficient collapse of the ISM into stars. The ``Survey of Water and Ammonia in Nearby Galaxies" (SWAN) is a survey of molecular line tracers in four nearby galaxies. By using molecular tracers of feedback, we provide insights into the star forming ecosystem of the galaxies NGC 253, IC 342, NGC 6946, and NGC 2146. These galaxies were chosen to span an order of magnitude in star formation rate and …