rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Dynamics All the Way Down: The Satellites, Streams, and Stellar Halo of the Milky Way in the Gaia Era
  name:
    name part: Riley, Alexander H
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Strigari, Louis
    role:
      role term: thesis advisor.
  name:
    name part: Texas A&M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2023
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: The release of high-precision astrometric data from the Gaia space mission has revolutionized studies of the Milky Way's halo substructures over the past few years. In this dissertation, I use this data to model the dynamics of Milky Way satellite galaxies, globular clusters, stellar streams, and the stellar halo, often by incorporating comparisons to cosmological simulations that include galaxy formation. I find that the Milky Way satellite galaxies have tangentially dominated motions, a kinematic signature consistent with the central galaxy disrupting radial orbits that pass nearby. Using updated catalogs of globular cluster phase-space measurements and new stellar stream discoveries, I show that these substructures are not aligned with the Milky Way's plane of satellite galaxies, suggesting this unusual orbital configuration in Î₎CDM is not a long-lived structure or the result of a recent accretion event. I additionally report a new dynamical association between the globular cluster NGC 3201 and the Gj©œll stellar stream, which is confirmed using spectroscopic follow-up to obtain radial velocities and chemical abundance information. Finally, I describe how we can develop simulation and modeling infrastructure to properly leverage observations from upcoming facilities in the next generation of Local Group dynamical studies. The electronic version of this dissertation is accessible from https://hdl.handle.net/1969.1/198021
  note: by Alexander Riley.
  note: "Major Subject: Astronomy"
  note: Includes vita.
  note: Doctor of Philosophy Texas A&M University 2022 https://hdl.handle.net/1969.1/198021
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Astronomy
  subject:
    topic: Milky Way
  subject:
    topic: Local Group dynamics
  subject:
    topic: dwarf galaxies
  subject:
    topic: stellar streams
  subject:
    topic: near-field cosmology
  subject:
    topic: dark matter
  identifier: https://hdl.handle.net/1969.1/198021
  record info:
    record content source: TXA
    record creation date: 240827
    record change date: 20240829173517.0
    record identifier: in00005468653
    language of cataloging:
      language term: eng