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dc.contributor.advisorBurnett, Thompsonen_US
dc.contributor.authorRoth, Marshallen_US
dc.date.accessioned2012-09-13T17:30:21Z
dc.date.available2013-03-13T11:04:55Z
dc.date.issued2012-09-13
dc.date.submitted2012en_US
dc.identifier.otherRoth_washington_0250E_10446.pdfen_US
dc.identifier.urihttp://hdl.handle.net/1773/20699
dc.descriptionThesis (Ph.D.)--University of Washington, 2012en_US
dc.description.abstractThe Large-Area Telescope (LAT) on the <italic>Fermi</italic> Gamma-Ray Space Telescope is a pair-conversion gamma-ray telescope with unprecedented capability to image astrophysical gamma-ray sources between 20 MeV and 300 GeV. The pre-launch performance of the LAT, decomposed into effective area, energy and angular dispersions, were determined through extensive Monte Carlo (MC) simulations and beam tests. The point-spread function (PSF) characterizes the angular distribution of reconstructed photons as a function of energy and geometry in the detector. Here we present a set of likelihood analyses of LAT data based on the spatial and spectral properties of sources, including a determination of the PSF on orbit. We find that the PSF on orbit is generally broader than the MC at energies above 3 GeV and consider several systematic effects to explain this difference. We also investigated several possible spatial models for pair-halo emission around BL Lac AGN and found no evidence for a component with spatial extension larger than the PSF.en_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.rightsCopyright is held by the individual authors.en_US
dc.subjectagn; Fermi; gamma-ray; LAT; teven_US
dc.subject.otherAstrophysicsen_US
dc.subject.otherPhysicsen_US
dc.titleA Likelihood Method for Determining the On-orbit Point-Spread Function of the Fermi Large-Area Telescopeen_US
dc.typeThesisen_US
dc.embargo.termsDelay release for 6 months -- then make Open Accessen_US


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