{"id":{"repo_id":"york","oai_identifier":"oai:yorkspace.library.yorku.ca:10315/41934"},"canonical_url":"https://search.dev.ndltd.org/etd/york/oai:yorkspace.library.yorku.ca:10315/41934","repository":{"repo_id":"york","name":"York University","base_url":"https://yorkspace.library.yorku.ca/oai/request"},"display":{"title":"Self-Similar Models of Quasar Outflow Shock Structures","abstract":"Supersonic winds of outflowing material are observed and/or predicted in a number of astrophysical systems; such winds may drive an expanding shock structure that shocks and pushes the ambient interstellar medium (ISM) outward. This thesis analyses, combines and expands on existing analytic self-similar models of these structures in the context of quasar accretion disk winds; we then search for the bulk acceleration (positive or negative) of low-velocity Ca II in the quasar SDSS J030000.0+004828.0 (J0300) and compare our results to model predictions. We find a strong upper limit on the acceleration magnitude, yielding plausible model constraints, but the observed range of gas velocities implies that the Ca II velocity profile does not coincide with that of the shocked ISM. We conclude with a discussion of recent results regarding J0300's outflow properties and briefly investigate the possibility of pre-existing ISM cloud disruption as an explanation for the observed Ca II velocity profile.","abstract_html":"Supersonic winds of outflowing material are observed and/or predicted in a number of astrophysical systems; such winds may drive an expanding shock structure that shocks and pushes the ambient interstellar medium (ISM) outward. This thesis analyses, combines and expands on existing analytic self-similar models of these structures in the context of quasar accretion disk winds; we then search for the bulk acceleration (positive or negative) of low-velocity Ca II in the quasar SDSS J030000.0+004828.0 (J0300) and compare our results to model predictions. We find a strong upper limit on the acceleration magnitude, yielding plausible model constraints, but the observed range of gas velocities implies that the Ca II velocity profile does not coincide with that of the shocked ISM. We conclude with a discussion of recent results regarding J0300's outflow properties and briefly investigate the possibility of pre-existing ISM cloud disruption as an explanation for the observed Ca II velocity profile.","abstract_has_math":false,"creators":["Weiss, Erik Adam"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Hall, Patrick B."],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-03-16","date_published":"2024-03-16","updated_at":"2026-07-24T06:33:36Z","subjects":["Astrophysics","Astronomy"],"languages":["en"],"rights":["Author owns copyright, except where explicitly noted. Please contact the author directly with licensing requests."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/10315/41934","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Hall, Patrick B."]},{"key":"dc:creator","label":"Author","values":["Weiss, Erik Adam"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2024-03-18T18:13:06Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2024-03-18T18:13:06Z"]},{"key":"dc:date.issued","label":"Date","values":["2024-03-16"]},{"key":"dc:type","label":"Dc Type","values":["Electronic Thesis or Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Astrophysics","Astronomy"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Author owns copyright, except where explicitly noted. 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We find a strong upper limit on the acceleration magnitude, yielding plausible model constraints, but the observed range of gas velocities implies that the Ca II velocity profile does not coincide with that of the shocked ISM. We conclude with a discussion of recent results regarding J0300's outflow properties and briefly investigate the possibility of pre-existing ISM cloud disruption as an explanation for the observed Ca II velocity profile."]},{"key":"dc:title","label":"Title","values":["Self-Similar Models of Quasar Outflow Shock Structures"]}]}],"canonical_facts":{"dc:contributor.advisor":["Hall, Patrick B."],"dc:creator":["Weiss, Erik Adam"],"dc:date.accessioned":["2024-03-18T18:13:06Z"],"dc:date.available":["2024-03-18T18:13:06Z"],"dc:date.issued":["2024-03-16"],"dc:description.abstract":["Supersonic winds of outflowing material are observed and/or predicted in a number of astrophysical systems; such winds may drive an expanding shock structure that shocks and pushes the ambient interstellar medium (ISM) outward. This thesis analyses, combines and expands on existing analytic self-similar models of these structures in the context of quasar accretion disk winds; we then search for the bulk acceleration (positive or negative) of low-velocity Ca II in the quasar SDSS J030000.0+004828.0 (J0300) and compare our results to model predictions. We find a strong upper limit on the acceleration magnitude, yielding plausible model constraints, but the observed range of gas velocities implies that the Ca II velocity profile does not coincide with that of the shocked ISM. We conclude with a discussion of recent results regarding J0300's outflow properties and briefly investigate the possibility of pre-existing ISM cloud disruption as an explanation for the observed Ca II velocity profile."],"dc:identifier.uri":["https://hdl.handle.net/10315/41934"],"dc:language":["en"],"dc:rights":["Author owns copyright, except where explicitly noted. Please contact the author directly with licensing requests."],"dc:subject":["Astrophysics","Astronomy"],"dc:title":["Self-Similar Models of Quasar Outflow Shock Structures"],"dc:type":["Electronic Thesis or Dissertation"]},"updated_at":"2026-07-24T06:33:36Z"}