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: Exploring the Extremes of Galaxy Evolution: Progenitors of Star-Forming Galaxies and Relics of Quiescent Galaxies
  name:
    name part: Cohn, Jonathan Hall
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Walsh, Jonelle
    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: In this dissertation, I investigate the formation and evolution of galaxies by studying two extreme populations ⁰́₄ young, highly star forming galaxies (SFGs) at z > 2, and old, quiescent galaxies in the local Universe that are likely unchanged since z ⁹́⁸ 2. In the first project, I use spectral energy distribution (SED)-fitting to analyze the star formation histories (SFHs) of a population of extreme emission line galaxies (EELGs) identified in the ZFOURGE Survey at 2.5 ⁹́Þ z ⁹́Þ 4, comparing them to more typical SFGs at the same redshift range. This is the first z > 2 study to use the PROSPECTOR SED-fitting code. The EELGs display rising SFHs in the most recent 50 Myr, while more typical SFGs do not. I estimate that many, if not most, SFGs at z ⁹́Æ 2.5 undergo an extreme HÎø+[OIII] emission line phase early in their lifetimes. In the second project, I present 0Êð.14-resolution Atacama Large Millimeter/submillimeter Array (ALMA) CO(2⁸́₂1) observations of the circumnuclear gas disk in the local compact galaxy UGC 2698, a member of a sample of nearby early-type galaxies that are plausible z ⁹́⁸ 2 red nugget relics. I fit molecular gas-dynamical models to the ALMA data cube, assuming the CO emission originates from a dynamically cold, thin disk, and measure the mass of the supermassive black hole (BH) in UGC 2698. I explore systematics in the model and their effects on the measured BH mass. The BH in UGC 2698 is found to be consistent with the BH scaling relations, which I contrast with previous stellar-dynamical measurements for three other objects in the local compact galaxy sample. In the third project, I present ALMA CO(2⁸́₂1) observations at a resolution of 0Êð.22 in the local compact galaxies NGC 384 and PGC 11179. I make preliminary molecular gas-dynamical BH mass measurements in these galaxies and explore their systematic uncertainties. Finally, I discuss the next steps required to finalize these measurements and the implications of these results for our under…
  note: by Jonathan Cohn.
  note: "Major Subject: Astronomy"
  note: Includes vita.
  note: Doctor of Philosophy Texas A&M University 2022 https://hdl.handle.net/1969.1/197785
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Astronomy
  subject:
    topic: Galaxies
  subject:
    topic: Star formation histories
  subject:
    topic: Black holes
  subject:
    topic: molecular gas
  identifier: https://hdl.handle.net/1969.1/197785
  record info:
    record content source: TXA
    record creation date: 240823
    record change date: 20240829173455.5
    record identifier: in00005468331
    language of cataloging:
      language term: eng