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Nominated as an outstanding thesis by the Department of Physics and Astronomy of the University of New Mexico, this thesis seeks to identify the gamma-ray burst (GRB) progenitor. GRBs are extragalactic explosions that briefly outshine entire galaxies, but the mechanism that can release that much energy over a < 100 second burst is still a mystery. The leading candidate for the GRB progenitor is currently a massive star which collapses to form a black hole–accretion disk system that powers the GRB. GRB afterglows, however, do not always show the expected behavior of a relativistic blast wave interacting with the stellar wind that such a progenitor should have produced before its collapse. In this book, the author uses the Zeus-MP astrophysical hydrodynamics code to model the environment around a stellar progenitor prior to the burst. He then develops a new semi-analytic MHD and emission model to produce light curves for GRBs encountering these realistic density profiles. The work ultimately shows that the circumburst medium surrounding a GRB at the time of the explosion is much more complex than a pure wind, and that observed afterglows are entirely consistent with a large subset of proposed stellar progenitors.
Gamma ray bursts. --- Gamma ray sources. --- Bursts, Cosmic gamma ray --- Bursts, Gamma ray --- Cosmic gamma ray bursts --- Transients, Gamma ray --- Gamma ray astronomy --- X-ray bursts --- Gamma ray production --- Gamma sources --- Sources, Gamma ray --- Gamma rays --- Radiation sources --- Astrophysics. --- Mathematical physics. --- Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics). --- Mathematical Methods in Physics. --- Physical mathematics --- Physics --- Astronomical physics --- Astronomy --- Cosmic physics --- Mathematics --- Space sciences. --- Physics. --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Science and space --- Space research --- Cosmology --- Science
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