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Doc. Dissertation
ETD: Testing the dark matter caustic the   ETD: Testing the dark matter caustic the... - Doctoral Dissertation (4 K)
Creator Dumas, Julie .
Title Testing the dark matter caustic theory against observations in the Milky Way
Degree PhD
Department Dept. of Physics, Applied Physics, and Astronomy
Is Part of Rensselaer Theses and Dissertations Online Collection
Publisher Rensselaer Polytechnic Institute, Troy, NY
Date 2015-08
Language ENG
Description August 2015
School of Science
Abstract We test a particular theory of dark matter in which dark matter axions form ring ``caustics" in the plane of the Milky Way, against the observations of Milky Way stars. According to this theory, cold, collisionless dark matter particles with angular momentum flow in and out of the Milky Way on sheets. These flows form caustic rings (at the positions of the rings, the density of the flow is formally infinite) at the locations of closest approach to the Galactic center. We show that the caustic ring dark matter theory reproduces a roughly logarithmic halo, with large perturbations near the rings. We show that the theory can reasonably match the observed rotation curve of the Milky Way. We explore the effects of the caustic rings on dwarf galaxy tidal disruption using N-body simulations. In particular, simulations of the Sagittarius dwarf galaxy tidal disruption in a caustic ring halo potential match observations of the trailing tidal tail as far as 90 kpc from the Galactic center; though they do not match the leading tidal tail. None of the caustic ring, NFW, or triaxial logarithmic halos fit all of the data. The source code for calculating the acceleration due to a caustic ring halo has been made publicly available in the NEMO Stellar Dynamics Toolbox and the Milkyway@home client repository. We approximate the effect of dynamical friction on a dwarf galaxy moving through the mass distribution of a caustic ring. We show that the effect of dynamical friction is negligible for most reasonable cases.
Contributor Newberg, Heidi
Lewis, Kim M.
Roberge, W. G. (Wayne G.)
Napolitano, Jim
Magdon-Ismail, Malik
Subject Physics
Type Electronic thesis
Rights This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Access Rights Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.
Record number 000008763
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