Causality and Communication: Relativistic astrophysical jets and the implementation of science communication training in astronomy classes

Author
Abstract
<p><strong>Part I:</strong> Relativistic jets emitted from the centers of some galaxies (called active galaxies)\&nbsp;<span style="font-size: 13px; line-height: 1.6em;">exhibit many interesting behaviors that are not yet fully understood: acceleration and collimation\&nbsp;</span><span style="font-size: 13px; line-height: 1.6em;">over vast distances, for instance, and occasional flaring activity. In the first part of my thesis, I\&nbsp;</span><span style="font-size: 13px; line-height: 1.6em;">examine the possibility of collimation and acceleration of relativistic jets by the pressure of the\&nbsp;</span><span style="font-size: 13px; line-height: 1.6em;">ambient medium surrounding the jet base. I discuss the differences in predicted jet behavior due to\&nbsp;</span><span style="font-size: 13px; line-height: 1.6em;">including the effects of a magnetic field threading the jet interior, and I describe the conditions that\&nbsp;</span><span style="font-size: 13px; line-height: 1.6em;">create some observed jet shapes, such as the \textquotedbllefthollow cone\textquotedblright structure seen in M87 and similar jets.\&nbsp;</span><span style="font-size: 13px; line-height: 1.6em;">I also discuss what happens when the pressure outside of the jet drops so slowly that the jet shocks\&nbsp;</span><span style="font-size: 13px; line-height: 1.6em;">repeatedly, generating entropy at its boundary. Finally, I examine the spectra of the 40 brightest\&nbsp;</span><span style="font-size: 13px; line-height: 1.6em;">gamma-ray flares from blazars (active galaxies with jets pointed toward us) recorded by the Fermi\&nbsp;</span><span style="font-size: 13px; line-height: 1.6em;">Gamma-ray Space Telescope in its first four years of operation. I develop models to describe the\&nbsp;</span><span style="font-size: 13px; line-height: 1.6em;">observed behavior of these flares and discuss the physical implications of these models.\&nbsp;</span></p>
Year of Publication
2014
Degree
Ph. D.
Number of Pages
234
Date Published
12-12014
University
University of Colorado Boulder
City
Boulder, CO
Advisors - JILA Fellows
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