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postgraduate thesis: Theoretical study of [gamma]-ray emissions from pulsars

TitleTheoretical study of [gamma]-ray emissions from pulsars
Authors
Issue Date2016
PublisherThe University of Hong Kong (Pokfulam, Hong Kong)
Citation
Song, Y. [宋宇哲]. (2016). Theoretical study of [gamma]-ray emissions from pulsars. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR.
AbstractIn previous study, a three-dimensional two-layer outer gap model was proposed to explain the third peak in the light curve of Vela pulsar and could simulate the phase-resolved spectrum. After being applied to several different pulsars, it was discovered that there exist some deviations between the simulation results and the observed spectrum. Considering the outer gap structure may differ with time, the model then has been further developed into a non-stationary three-dimensional outer gap model. In this model, the outer gap is not stationary. The parameters in the stationary three-dimensional two-layer outer gap model have been assigned a power-law and calculate the weighted spectrum. Using this model, we found out that this model is available for some pulsars, but for pulsars like Geminga, it was still hard to explain the high energy part of its spectrum. An Inverse-Compton Scattering component has been added into the model to find out if it would _t the high energy spectrum of Geminga pulsar. The IC scattering happens between soft photons (radio) and ultra-relativistic particles in the outer gap. This component can provide sufficient GeV photons in the outer gap, according to our study.
DegreeMaster of Philosophy
SubjectPulsars - Spectra
Dept/ProgramPhysics
Persistent Identifierhttp://hdl.handle.net/10722/235862
HKU Library Item IDb5801695

 

DC FieldValueLanguage
dc.contributor.authorSong, Yuzhe-
dc.contributor.author宋宇哲-
dc.date.accessioned2016-11-09T23:26:51Z-
dc.date.available2016-11-09T23:26:51Z-
dc.date.issued2016-
dc.identifier.citationSong, Y. [宋宇哲]. (2016). Theoretical study of [gamma]-ray emissions from pulsars. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR.-
dc.identifier.urihttp://hdl.handle.net/10722/235862-
dc.description.abstractIn previous study, a three-dimensional two-layer outer gap model was proposed to explain the third peak in the light curve of Vela pulsar and could simulate the phase-resolved spectrum. After being applied to several different pulsars, it was discovered that there exist some deviations between the simulation results and the observed spectrum. Considering the outer gap structure may differ with time, the model then has been further developed into a non-stationary three-dimensional outer gap model. In this model, the outer gap is not stationary. The parameters in the stationary three-dimensional two-layer outer gap model have been assigned a power-law and calculate the weighted spectrum. Using this model, we found out that this model is available for some pulsars, but for pulsars like Geminga, it was still hard to explain the high energy part of its spectrum. An Inverse-Compton Scattering component has been added into the model to find out if it would _t the high energy spectrum of Geminga pulsar. The IC scattering happens between soft photons (radio) and ultra-relativistic particles in the outer gap. This component can provide sufficient GeV photons in the outer gap, according to our study.-
dc.languageeng-
dc.publisherThe University of Hong Kong (Pokfulam, Hong Kong)-
dc.relation.ispartofHKU Theses Online (HKUTO)-
dc.rightsThe author retains all proprietary rights, (such as patent rights) and the right to use in future works.-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subject.lcshPulsars - Spectra-
dc.titleTheoretical study of [gamma]-ray emissions from pulsars-
dc.typePG_Thesis-
dc.identifier.hkulb5801695-
dc.description.thesisnameMaster of Philosophy-
dc.description.thesislevelMaster-
dc.description.thesisdisciplinePhysics-
dc.description.naturepublished_or_final_version-

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