Exploring the dynamics and dark halos of elliptical galaxies at large radii

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Exploring the dynamics and dark halos of elliptical galaxies at large radii

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dc.contributor.advisor Gebhardt, Karl
dc.creator Forestell, Amy Dove
dc.date.accessioned 2009-10-23T16:31:12Z
dc.date.available 2009-10-23T16:31:12Z
dc.date.created 2009-08
dc.date.issued 2009-10-23T16:31:12Z
dc.identifier.uri http://hdl.handle.net/2152/6641
dc.description.abstract Dark matter is now accepted as an integral part of our universe, and galaxy dynamics have long provided the most convincing observational evidence for dark matter. Spiral galaxies have traditionally been used for these studies because of their more simple kinematics, however elliptical galaxies need to be understood as well. In this dissertation I present deep long-slit spectroscopy from the University of Texas’ Hobby-Eberly Telescope for a sample of elliptical galaxies. For a subsample of galaxies I fit axisymmetric orbit-superposition models with a range of dark halo density profiles. I find that all three galaxies modeled require a significant dark halo to explain their motions. However, the shape of the dark halo is not the expected NFW profile, but rather a profile with a flat central slope. I also discuss the galaxy masses, anisotropies, and stellar mass-to-light ratios.
dc.format.medium electronic
dc.language.iso eng
dc.rights Copyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.
dc.subject Dark matter
dc.subject Elliptical galaxies
dc.subject Deep long-slit spectroscopy
dc.subject Dark halos
dc.subject Hobby-Eberly telescope
dc.subject Axisymmetric orbit-superposition models
dc.subject Galaxy masses
dc.subject Anisotropies
dc.subject Stellar mass-to-light ratios
dc.title Exploring the dynamics and dark halos of elliptical galaxies at large radii
dc.description.department Astronomy
dc.type.genre Thesis
dc.type.material text
thesis.degree.department Astronomy
thesis.degree.discipline Astronomy
thesis.degree.grantor The University of Texas at Austin
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy

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