Undergraduate Thesis Or Project

 

Deriving relationships between number of observed short gamma ray bursts and viewing angle Public Deposited

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https://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/v405sg96h

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  • Gamma ray bursts are some of the brightest events in the entire observable universe. Since the late 1960’s, thousands of gamma ray bursts have been observed and they have been researched extensively. However, there are still many mysteries which remain unsolved. One such mystery is whether or not the viewing angle, more specifically the off-axis viewing angle, of short gamma ray bursts affects the distribution of bursts. It has been suspected that at least some of the features of the gamma ray burst distribution are due to off-axis viewing (meaning the burst was observed at large angles relative to its propagation direction). In this study, Monte-Carlo simulations were used to determine the relationships between the number of observable short gamma ray bursts and the flux of those bursts based on randomly generated viewing angles. Here we show that the viewing angle is a primary contributor of the shape of the distribution of short gamma ray bursts. Other effects include the geometry of the universe, its expansion rate, and its star formation rate. Understanding this relationship will allow for better contextualization of the experimental data that has been gathered for the past 50+ years. Further studies should be done to exclude some of the other parameters that affect the distribution, such as distance, in order to further refine the relationship between viewing angle, flux, and number.
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