Exploring the bizarrerie : research on selective physical processes in gamma-ray bursts


Exploring the bizarrerie : research on selective physical processes in gamma-ray bursts

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dc.contributor.advisor Kumar, Pawan
dc.creator Shen, Rongfeng
dc.date.accessioned 2010-11-02T16:01:54Z
dc.date.accessioned 2010-11-02T16:02:02Z
dc.date.available 2010-11-02T16:01:54Z
dc.date.available 2010-11-02T16:02:02Z
dc.date.created 2010-08
dc.date.issued 2010-11-02
dc.date.submitted August 2010
dc.identifier.uri http://hdl.handle.net/2152/ETD-UT-2010-08-1880
dc.description.abstract Gamma-ray bursts (GRBs) are the mysterious, short and intense flashes of gamma-rays in the space, and are believed to originate from the rare, explosively devastating, stellar events that happens at cosmological distances. Enormous progress has been made from four decades of GRB research endeavor but the ultimate understanding of their origins has yet to arrive. Recently revealed features in their early afterglows broadened the opportunity space for exploration. We have carried out extensive studies on various physical processes in GRBs. We showed that the distribution of electrons' energy spectral index in GRBs and other relativistic sources is inconsistent with the prediction from the first-order Fermi theory of the shock particle acceleration. We investigated the photon scattering processes within the relativistic outflow that produces the GRB and calculated the resultant emission flux from it. We showed the scattering of the GRB prompt photons by the circum-burst dust, although an attractive possibility, can not explain the puzzling plateau component in the GRB afterglow light curve. We made meaningful constraint on the GRB prompt emission radius, R [greater-than or equal to] 10¹⁴, by studying the synchrotron self absorption for a small sample of bursts with good data. We showed that a late jet, which is thought to be producing the late X-ray flares in GRB afterglows, will produce detectable emissions from its interactions with other components in the explosive event of GRB, and identification of these emissions could verify the existence of the late jet and further prove the massive star origin of long-duration GRBs.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subject Gamma-rays
dc.subject Gamma-ray bursts
dc.subject Relativity
dc.subject Photon scattering
dc.subject Light curve
dc.title Exploring the bizarrerie : research on selective physical processes in gamma-ray bursts
dc.date.updated 2010-11-02T16:02:02Z
dc.contributor.committeeMember Wheeler, J. Craig
dc.contributor.committeeMember Robinson, Edward L.
dc.contributor.committeeMember Bromm, Volker
dc.contributor.committeeMember Zhang, Bing
dc.contributor.committeeMember Hoeflich, Peter
dc.contributor.committeeMember Milosavljevic, Milos
dc.description.department Astronomy
dc.type.genre thesis
dc.type.material text
thesis.degree.department Astronomy
thesis.degree.discipline Astronomy
thesis.degree.grantor University of Texas at Austin
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy

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