{"id":{"repo_id":"bologna","oai_identifier":"oai:amsdottorato.cib.unibo.it:633"},"canonical_url":"https://search.dev.ndltd.org/etd/bologna/oai:amsdottorato.cib.unibo.it:633","repository":{"repo_id":"bologna","name":"Università di Bologna","base_url":"https://amsdottorato.unibo.it/cgi/oai2"},"display":{"title":"Properties of gas and dark matter in X-ray galaxy clusters with Sunyaev Zel'dovich measurements","abstract":"I have studied entropy profiles obtained in a sample of 24 X-ray objects at high redshift retrieved from the Chandra archive. I have discussed the scaling properties of the entropy S, the correlation between metallicity Z and S, the profiles of the temperature of the gas, Tgas, and performed a comparison between the dark matter 'temperature' and Tgas in order to constrain the non-gravitational processes which affect the thermal history of the gas. Furthermore I have studied the scaling relations between the X-ray quantities and Sunyaev Zel'dovich measurements. I have observed that X-ray laws are steeper than the relations predicted from the adiabatic model. These deviations from expectations based on self-similarity are usually interpreted in terms of feedback processes leading to non-gravitational gas heating, and suggesting a scenario in which the ICM at higher redshift has lower both X-ray luminosity and pressure in the central regions than the expectations from self-similar model. I have also investigated a Bayesian X-ray and Sunyaev Zel'dovich analysis, which allows to study the external regions of the clusters well beyond the volumes resolved with X-ray observations (1/3-1/2 of the virial radius), to measure the deprojected physical cluster properties, like temperature, density, entropy, gas mass and total mass up to the virial radius.","abstract_html":"I have studied entropy profiles obtained in a sample of 24 X-ray objects at high redshift retrieved from the Chandra archive. I have discussed the scaling properties of the entropy S, the correlation between metallicity Z and S, the profiles of the temperature of the gas, Tgas, and performed a comparison between the dark matter 'temperature' and Tgas in order to constrain the non-gravitational processes which affect the thermal history of the gas. Furthermore I have studied the scaling relations between the X-ray quantities and Sunyaev Zel'dovich measurements. I have observed that X-ray laws are steeper than the relations predicted from the adiabatic model. These deviations from expectations based on self-similarity are usually interpreted in terms of feedback processes leading to non-gravitational gas heating, and suggesting a scenario in which the ICM at higher redshift has lower both X-ray luminosity and pressure in the central regions than the expectations from self-similar model. I have also investigated a Bayesian X-ray and Sunyaev Zel'dovich analysis, which allows to study the external regions of the clusters well beyond the volumes resolved with X-ray observations (1/3-1/2 of the virial radius), to measure the deprojected physical cluster properties, like temperature, density, entropy, gas mass and total mass up to the virial radius.","abstract_has_math":false,"creators":["Morandi, Andrea <1979>"],"institution":"Alma Mater Studiorum - Università di Bologna","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Moscardini, Lauro"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2008,"date_issued":"2008-03-28","date_published":"2008-03-28","updated_at":"2026-07-24T01:11:53Z","subjects":["FIS/05 Astronomia e astrofisica"],"languages":["en"],"rights":["info:eu-repo/semantics/openAccess"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["urn:nbn:it:unibo-604"],"render_values":[{"text":"urn:nbn:it:unibo-604","href":null,"code":true}]}]},"links":{"outbound_url":"https://doi.org/10.6092/unibo/amsdottorato/633.","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Moscardini, Lauro"]},{"key":"dc:creator","label":"Author","values":["Morandi, Andrea <1979>"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2008-03-28"]},{"key":"dc:publisher","label":"Institution","values":["Alma Mater Studiorum - Università di Bologna"]},{"key":"dc:relation","label":"Dc Relation","values":["https://amsdottorato.unibo.it/id/eprint/633/"]},{"key":"dc:type","label":"Dc Type","values":["Doctoral Thesis","PeerReviewed"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["FIS/05 Astronomia e astrofisica"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["info:eu-repo/semantics/openAccess"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://amsdottorato.unibo.it/id/eprint/633/1/Tesi_Morandi_Andrea.pdf","urn:nbn:it:unibo-604","Morandi, Andrea (2008) Properties of gas and dark matter in X-ray galaxy clusters with Sunyaev Zel'dovich measurements, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Astronomia , 20 Ciclo. DOI 10.6092/unibo/amsdottorato/633."]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["I have studied entropy profiles obtained in a sample of 24 X-ray objects at high redshift retrieved from the Chandra archive. I have discussed the scaling properties of the entropy S, the correlation between metallicity Z and S, the profiles of the temperature of the gas, Tgas, and performed a comparison between the dark matter 'temperature' and Tgas in order to constrain the non-gravitational processes which affect the thermal history of the gas. Furthermore I have studied the scaling relations between the X-ray quantities and Sunyaev Zel'dovich measurements. I have observed that X-ray laws are steeper than the relations predicted from the adiabatic model. These deviations from expectations based on self-similarity are usually interpreted in terms of feedback processes leading to non-gravitational gas heating, and suggesting a scenario in which the ICM at higher redshift has lower both X-ray luminosity and pressure in the central regions than the expectations from self-similar model. I have also investigated a Bayesian X-ray and Sunyaev Zel'dovich analysis, which allows to study the external regions of the clusters well beyond the volumes resolved with X-ray observations (1/3-1/2 of the virial radius), to measure the deprojected physical cluster properties, like temperature, density, entropy, gas mass and total mass up to the virial radius."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Properties of gas and dark matter in X-ray galaxy clusters with Sunyaev Zel'dovich measurements"]}]}],"canonical_facts":{"dc:contributor":["Moscardini, Lauro"],"dc:creator":["Morandi, Andrea <1979>"],"dc:date":["2008-03-28"],"dc:description":["I have studied entropy profiles obtained in a sample of 24 X-ray objects at high redshift retrieved from the Chandra archive. I have discussed the scaling properties of the entropy S, the correlation between metallicity Z and S, the profiles of the temperature of the gas, Tgas, and performed a comparison between the dark matter 'temperature' and Tgas in order to constrain the non-gravitational processes which affect the thermal history of the gas. Furthermore I have studied the scaling relations between the X-ray quantities and Sunyaev Zel'dovich measurements. I have observed that X-ray laws are steeper than the relations predicted from the adiabatic model. These deviations from expectations based on self-similarity are usually interpreted in terms of feedback processes leading to non-gravitational gas heating, and suggesting a scenario in which the ICM at higher redshift has lower both X-ray luminosity and pressure in the central regions than the expectations from self-similar model. I have also investigated a Bayesian X-ray and Sunyaev Zel'dovich analysis, which allows to study the external regions of the clusters well beyond the volumes resolved with X-ray observations (1/3-1/2 of the virial radius), to measure the deprojected physical cluster properties, like temperature, density, entropy, gas mass and total mass up to the virial radius."],"dc:format":["application/pdf"],"dc:identifier":["https://amsdottorato.unibo.it/id/eprint/633/1/Tesi_Morandi_Andrea.pdf","urn:nbn:it:unibo-604","Morandi, Andrea (2008) Properties of gas and dark matter in X-ray galaxy clusters with Sunyaev Zel'dovich measurements, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Astronomia , 20 Ciclo. DOI 10.6092/unibo/amsdottorato/633."],"dc:language":["en"],"dc:publisher":["Alma Mater Studiorum - Università di Bologna"],"dc:relation":["https://amsdottorato.unibo.it/id/eprint/633/"],"dc:rights":["info:eu-repo/semantics/openAccess"],"dc:subject":["FIS/05 Astronomia e astrofisica"],"dc:title":["Properties of gas and dark matter in X-ray galaxy clusters with Sunyaev Zel'dovich measurements"],"dc:type":["Doctoral Thesis","PeerReviewed"]},"updated_at":"2026-07-24T01:11:53Z"}