Towards understanding magnetic field generation in relativistic shocks with GRB afterglow observations and the GRB radiation mechanism with photospheric simulations and the X-ray flare radiation mechanism

dc.contributor.advisorKumar, Pawanen
dc.contributor.committeeMemberMilosavljevic, Milosen
dc.contributor.committeeMemberRobinson, Edward Len
dc.contributor.committeeMemberWheeler, Craigen
dc.contributor.committeeMemberMatzner, Richard Aen
dc.creatorSantana, Rodolfoen
dc.date.accessioned2016-02-05T21:11:06Zen
dc.date.available2016-02-05T21:11:06Zen
dc.date.issued2015-12en
dc.date.submittedDecember 2015en
dc.date.updated2016-02-05T21:11:06Zen
dc.description.abstractIn this thesis, we present three projects on open questions in the Gammaray Burst (GRB) field. In the first project, we used X-ray and optical observations to determine the amount of amplification of the ISM magnetic field needed to explain the GRB afterglow observations. We determined that mild amplification is required, at a level stronger than shock-compression but weaker than predicted by the Weibel mechanism. In the second project, we present a Monte Carlo code we wrote from scratch to perform realistic simulations of the photospheric process, one of the mechanisms considered to explain the GRB gamma-ray emission. We determined that photospheric emission can explain the GRB gamma-ray spectrum above the peak-energy if the photons are taken to have a temperature much smaller than the electron temperature and if the interactions between photons and electrons take place at a large optical depth. In the third project, we used multi-wavelength observations to constrain the X-ray flare radiation mechanism. We determined that synchrotron from a Poynting jet and the Photospheric process are the best candidates to explain the X-ray flare observations.en
dc.description.departmentAstronomyen
dc.format.mimetypeapplication/pdfen
dc.identifierdoi:10.15781/T24T0Ken
dc.identifier.urihttp://hdl.handle.net/2152/32907en
dc.language.isoenen
dc.subjectAstrophysicsen
dc.titleTowards understanding magnetic field generation in relativistic shocks with GRB afterglow observations and the GRB radiation mechanism with photospheric simulations and the X-ray flare radiation mechanismen
dc.typeThesisen
thesis.degree.departmentAstronomyen
thesis.degree.disciplineAstronomyen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophyen

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