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A Search For Warm-Hot Intergalactic Matter in the Local Sheet of Galaxies

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dc.contributor.advisorMcCall, Marshall
dc.creatorDeneault, Ryan Scott
dc.date.accessioned2015-12-16T19:19:26Z
dc.date.available2015-12-16T19:19:26Z
dc.date.copyright2015-06-24
dc.date.issued2015-12-16
dc.date.updated2015-12-16T19:19:25Z
dc.degree.disciplinePhysics and Astronomy
dc.degree.levelMaster's
dc.degree.nameMSc - Master of Science
dc.description.abstract30-40% of all baryons in the Universe are thought to reside in the warm-hot intergalactic medium (WHIM) at temperatures in the range of 10^5-10^7 K. If the oxygen abundance is comparable to expectations, then OVI absorption from the WHIM associated with the Local Sheet of galaxies should have been detected in background sources observed by the Far-Ultraviolet Spectroscopic Explorer (FUSE). FUSE spectra of targets spanning the entire sky have been examined to distinguish the WHIM in the Sheet from other sources. These observations suggest that the Sun is offset from the plane of the Local Sheet WHIM, defining a theoretical framework against which the data was compared. By looking for a correlation of the OVI absorption equivalent widths with latitude and comparing the results to hydrodynamical simulations, strong constraints have been placed on the properties of the WHIM. With a hydrogen number density equal to that predicted by the simulations, the upper limit to the oxygen abundance for the WHIM in the Local Sheet must be 0.05 ± 0.01 Z⊙. If instead a metallicity of 0.1 Z⊙ is adopted for the WHIM, the upper limit to the hydrogen number density must be 0.64 ± 0.02 times that predicted by the simulations.
dc.identifier.urihttp://hdl.handle.net/10315/30670
dc.language.isoen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectAstrophysics
dc.subject.keywordsLocal Sheet
dc.subject.keywordsWarm Hot Intergalactic Medium
dc.subject.keywordsWHIM
dc.subject.keywordsMissing Baryons
dc.subject.keywordsFUSE
dc.subject.keywordsFar Ultraviolet Spectroscopic Explorer
dc.subject.keywordsWarm Hot Gas
dc.subject.keywordsSheets
dc.titleA Search For Warm-Hot Intergalactic Matter in the Local Sheet of Galaxies
dc.typeElectronic Thesis or Dissertation

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