Gamma-ray bursts and their afterglows: toward a unified model

Show simple item record


dc.contributor.advisor Kumar , Pawan en_US
dc.identifier.oclc 221307546 en_US
dc.creator McMahon , Erin Malia , 1980 - en_US
dc.date.accessioned 2008 -08 -29T00 :10 :41Z
dc.date.accessioned 2014 -02 -19T22 :35 :13Z
dc.date.available 2008 -08 -29T00 :10 :41Z
dc.date.available 2014 -02 -19T22 :35 :13Z
dc.date.created 2007 -12 en_US
dc.date.issued 2008 -08 -29T00 :10 :41Z
dc.identifier.uri http : / /hdl .handle .net /2152 /3790
dc.description.abstract Although much progress has been made in our understanding of gamma -ray bursts (GRBs ) and their afterglows in the last few decades , some critical questions remain unanswered . One of these questions regards the form in which energy is transported from the explosion to the site at which the gamma -rays are produced - - i .e . is the energy carried in the kinetic energy of electrons and /or protons , or is much of it stored in a magnetic field ? This dissertation documents a series of attempts to more clearly understand the nature of GRB outflows . First , we explore the possibility that the GRB is produced by an external shock , created when a baryonic outflow is decelerated by the surrounding medium . Next , emission from the external reverse shock is used to try to determine if the GRB ejecta is pair enriched . We then use data from several interesting , Swift -detected GRBs pin down the GRB emission radius , bulk Lorentz factor , magnetic field strength , and electron energy . We end by describing our nearly model independent method of modeling the GRB radiation as a combination of synchrontron and synchrontron self -Compton . We find that the GRB is likely to be produced by the syncrontron self -Compton radiation mechanism and predict that the accompanying prompt optical emission should be very high . If bright optical radiation during the GRB is not found , we think that this is good evidence that the acceleration of electrons is taking place repeatedly on a short timescale , effectively ruling out shock -based acceleration models . en_US
dc.format.medium electronic en_US
dc.language.iso eng en_US
dc.rights Copyright © is held by the author . Presentation of this material on the Libraries' web site by University Libraries , The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works . en_US
dc.subject.lcsh Gamma ray bursts en_US
dc.title Gamma -ray bursts and their afterglows : toward a unified model en_US
dc.description.department Astronomy en_US
dc.identifier.recnum b69902446 en_US
dc.type.genre Thesis en_US
dc.type.material text en_US
thesis.degree.name Doctor of Philosophy en_US
thesis.degree.level Doctoral en_US
thesis.degree.discipline Astronomy en_US
thesis.degree.grantor The University of Texas at Austin en_US
thesis.degree.department Astronomy en_US

Citation

Gamma-ray bursts and their afterglows: toward a unified model. Doctoral dissertation, The University of Texas at Austin. Available electronically from http : / /hdl .handle .net /2152 /3790 .

Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search DSpace

Advanced Search

Browse