A Likelihood Method for Determining the On-orbit Point-Spread Function of the Fermi Large-Area Telescope

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A Likelihood Method for Determining the On-orbit Point-Spread Function of the Fermi Large-Area Telescope

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dc.contributor.advisor Burnett, Thompson en_US
dc.contributor.author Roth, Marshall en_US
dc.date.accessioned 2012-09-13T17:30:21Z
dc.date.available 2013-03-13T11:04:55Z
dc.date.issued 2012-09-13
dc.date.submitted 2012 en_US
dc.identifier.other Roth_washington_0250E_10446.pdf en_US
dc.identifier.uri http://hdl.handle.net/1773/20699
dc.description Thesis (Ph.D.)--University of Washington, 2012 en_US
dc.description.abstract The 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.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.subject agn; Fermi; gamma-ray; LAT; tev en_US
dc.subject.other Astrophysics en_US
dc.subject.other Physics en_US
dc.title A Likelihood Method for Determining the On-orbit Point-Spread Function of the Fermi Large-Area Telescope en_US
dc.type Thesis en_US
dc.embargo.terms Delay release for 6 months -- then make Open Access en_US


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