The motion of stars and the accretion of matter in the fermion ball and black hole scenarios of the galactic centre

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dc.contributor.advisorViollier, Raoulen_ZA
dc.contributor.authorHalliday, Samuel James Alexanderen_ZA
dc.date.accessioned2014-11-11T20:19:23Z
dc.date.available2014-11-11T20:19:23Z
dc.date.issued2003en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractThe motion of stars SO-I, SO-2 and SO-4, in the vicinity of the galactic centre, is investigated using a X2 analysis of the parameters in our line of sight. The resulting phase spaces for the black hole and fermion ball scenarios are compared. We find that due to the lack of accurate z or Vz data, the upper limit of required observational time to discriminate between the scenarios is of the order 30 to 40 years. Such z and Vz data might allow us to eliminate one of the scenarios immediately. The spectrum from the Sgr A * region is also investigated using a simple Newtonian, optically thick and geometrically thin model for each scenario. As has already been known for some time, this technique is not applicable to a possible black hole scenario at Sgr A * and as a consequence, is incapable of explaining a cut-off in the spectrum at around 1013Hz. This cut-off follows naturally from the fermion ball potential distribution in this simple model. It should be noted that Advection Dominated Accretion Flow models (not investigated here) are able to predict the observed spectrum for the black hole scenario.en_ZA
dc.identifier.apacitationHalliday, S. J. A. (2003). <i>The motion of stars and the accretion of matter in the fermion ball and black hole scenarios of the galactic centre</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Physics. Retrieved from http://hdl.handle.net/11427/9586en_ZA
dc.identifier.chicagocitationHalliday, Samuel James Alexander. <i>"The motion of stars and the accretion of matter in the fermion ball and black hole scenarios of the galactic centre."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Physics, 2003. http://hdl.handle.net/11427/9586en_ZA
dc.identifier.citationHalliday, S. 2003. The motion of stars and the accretion of matter in the fermion ball and black hole scenarios of the galactic centre. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Halliday, Samuel James Alexander AB - The motion of stars SO-I, SO-2 and SO-4, in the vicinity of the galactic centre, is investigated using a X2 analysis of the parameters in our line of sight. The resulting phase spaces for the black hole and fermion ball scenarios are compared. We find that due to the lack of accurate z or Vz data, the upper limit of required observational time to discriminate between the scenarios is of the order 30 to 40 years. Such z and Vz data might allow us to eliminate one of the scenarios immediately. The spectrum from the Sgr A * region is also investigated using a simple Newtonian, optically thick and geometrically thin model for each scenario. As has already been known for some time, this technique is not applicable to a possible black hole scenario at Sgr A * and as a consequence, is incapable of explaining a cut-off in the spectrum at around 1013Hz. This cut-off follows naturally from the fermion ball potential distribution in this simple model. It should be noted that Advection Dominated Accretion Flow models (not investigated here) are able to predict the observed spectrum for the black hole scenario. DA - 2003 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2003 T1 - The motion of stars and the accretion of matter in the fermion ball and black hole scenarios of the galactic centre TI - The motion of stars and the accretion of matter in the fermion ball and black hole scenarios of the galactic centre UR - http://hdl.handle.net/11427/9586 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/9586
dc.identifier.vancouvercitationHalliday SJA. The motion of stars and the accretion of matter in the fermion ball and black hole scenarios of the galactic centre. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Physics, 2003 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/9586en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Physicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.titleThe motion of stars and the accretion of matter in the fermion ball and black hole scenarios of the galactic centreen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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