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A Cross-Correlation Search For Continuous Gravitational Waves From Scorpius X-1 In Advanced Ligo O3 Data, Jared K. Wofford
A Cross-Correlation Search For Continuous Gravitational Waves From Scorpius X-1 In Advanced Ligo O3 Data, Jared K. Wofford
Theses
Gravitational waves are deformations in spacetime that propagate at the speed of light outward from many astrophysical sources. Compact objects (black holes and neutron stars) merging in binary systems have produced many detectable events from ground-based interferometer gravitational wave detectors. Since the aLIGO detectors went active in 2015, many detections have been made of compact binary coalescence (CBC) systems, including a binary neutron star merger, which resulted in a kilonova and gamma-ray burst that was further measured by traditional electromagnetic telescopes. The detection of continuous gravitational waves emitted from rapidly rotating neutron stars would be a landmark detection as well, …
Population Inference Of Non-Spinning Eccentric Binary Black Holes, Muhammad Zeeshan
Population Inference Of Non-Spinning Eccentric Binary Black Holes, Muhammad Zeeshan
Theses
Compact binary mergers produce gravitational waves (GWs), which carry information about their sources. The LIGO-VIRGO-KAGRA network detects GWs signals, and we use those measurements to infer BBHs population properties such as mass, spin, and eccentricity distribution in the universe. Binary component masses and spins are well-known to provide insight into the source formation, evolution, and environment. Unlike these two, eccentricity is a unique and measurable signature of strongly interacting events. Unfortunately, most available parameter estimation results for GWs signals do not include eccentricity: models for binary merger with eccentricity have minimal availability and parameter coverage. Therefore, to assess how well …
The Interstellar Scintillation Of Psr J1614-2230, Lekshmi Rajagopal
The Interstellar Scintillation Of Psr J1614-2230, Lekshmi Rajagopal
Theses
Observations of the millisecond pulsar J1614-2230 as part of the NANOGrav 12.5 yr dataset were utilised to study the scintillation and interstellar medium along the line of sight of PSR J1614-2230. Modelling noise signals in pulsar line of sight allows for isolation of the raw signal and therefore more precise pulse period measurements. These are extremely useful in Pulsar Timing Arrays and in their potential to be used as cosmic detectors for the gravitational wave background. J1614 presented clear, distinguishable intensity variations in a long observation taken in March 2014 by B.J.Shapiro-Albert et al. (2020), which provided motivation to further …