Doctor of Philosophy in Astronomy
Physics and Astronomy
First Committee Member
Bing Zhang, Chair
Second Committee Member
Third Committee Member
Graduate Faculty Representative
Number of Pages
Over the last fifty years the field of gamma-ray bursts has shown incredible growth, but the amassing of data has also left observers and theorists alike wondering about some of the basic questions surrounding these phenomena. Additionally, these events show remarkable individuality and extrema, ranging in redshift throughout the observable universe and over ten orders of magnitude in energy. This work focuses on analyzing groups of bursts that are different from the general trend and trying to understand whether these bursts are from different intrinsic populations and if so, what can be said about their progenitors. This is achieved through numerical Monte Carlo simulations and statistical inference in conjunction with current GRB observations. Chapter 1 gives a general introduction of gamma-ray burst theory and observations in a semi-historical context. Chapter 2 provides an introduction to the theory and practical issues surrounding the numerical simulations and statistics. Chapters 3-5 are each dedicated to a specific problem relating to a different type of GRB population: high-luminosity v. low-luminosity bursts, constraints from high-redshift bursts, and Type I v. Type II bursts. Chapter 6 follows with concluding remarks.
Gamma-ray bursts; Gamma ray spectrometry
Astrophysics and Astronomy
Virgili, Francisco J., "Gamma-ray burst populations" (2011). UNLV Theses, Dissertations, Professional Papers, and Capstones. 933.