{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/8284"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/8284","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"X-ray absorption by the intergalactic medium","abstract":"I have studied the intergalactic medium (IGM) located in galaxy clusters and groups via the so-called \"X-ray Forest\" the X-ray absorption lines produced by the hot IGM. I gave a semi-analytic calculation of the X-ray forest distribution based on the Press-Schechter formalism. The warm-hot intergalactic medium - the IGM between 10⁵ - 10⁷ K - was investigated via hydrodynamic simulation. I analyzed the simulated spectra which were synthesized in a way similar to simulating the Lya forest and studied column density and the Doppler b-parameter distributions of highly-ionized metals. Finally, we studied X-ray spectra of two high-redshift quasars, S5 0836+710 and PKS 2149-306, obtained with the Chandra High Energy Transmission Grating Spectrometer (HETGS). While no absorption features were detected, a method of constraining the IGM via the X-ray forest theory was proposed. I also discuss constraining the IGM via the X-ray Gunn-Peterson test.","abstract_html":"I have studied the intergalactic medium (IGM) located in galaxy clusters and groups via the so-called "X-ray Forest" the X-ray absorption lines produced by the hot IGM. I gave a semi-analytic calculation of the X-ray forest distribution based on the Press-Schechter formalism. The warm-hot intergalactic medium - the IGM between 10⁵ - 10⁷ K - was investigated via hydrodynamic simulation. I analyzed the simulated spectra which were synthesized in a way similar to simulating the Lya forest and studied column density and the Doppler b-parameter distributions of highly-ionized metals. Finally, we studied X-ray spectra of two high-redshift quasars, S5 0836+710 and PKS 2149-306, obtained with the Chandra High Energy Transmission Grating Spectrometer (HETGS). While no absorption features were detected, a method of constraining the IGM via the X-ray forest theory was proposed. I also discuss constraining the IGM via the X-ray Gunn-Peterson test.","abstract_has_math":false,"creators":["Fang, Taotao, 1970-"],"institution":"Massachusetts Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Dept. of Physics.","school":null,"contributors":[],"advisors":["Claude R. Canizares."],"committee_chairs":[],"committee_members":[],"year":2001,"date_issued":"2001","date_published":"2001","updated_at":"2026-07-22T22:22:01Z","subjects":["Physics."],"languages":["eng"],"rights":["M.I.T. theses are protected by copyright. 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I gave a semi-analytic calculation of the X-ray forest distribution based on the Press-Schechter formalism. The warm-hot intergalactic medium - the IGM between 10⁵ - 10⁷ K - was investigated via hydrodynamic simulation. I analyzed the simulated spectra which were synthesized in a way similar to simulating the Lya forest and studied column density and the Doppler b-parameter distributions of highly-ionized metals. Finally, we studied X-ray spectra of two high-redshift quasars, S5 0836+710 and PKS 2149-306, obtained with the Chandra High Energy Transmission Grating Spectrometer (HETGS). While no absorption features were detected, a method of constraining the IGM via the X-ray forest theory was proposed. I also discuss constraining the IGM via the X-ray Gunn-Peterson test."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Ph.D."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["X-ray absorption by the intergalactic medium"]}]}],"canonical_facts":{"dc:contributor.advisor":["Claude R. Canizares."],"dc:contributor.department":["Massachusetts Institute of Technology. Dept. of Physics."],"dc:contributor.other":["Massachusetts Institute of Technology. Dept. of Physics."],"dc:creator":["Fang, Taotao, 1970-"],"dc:date.accessioned":["2005-08-23T18:52:55Z"],"dc:date.available":["2005-08-23T18:52:55Z"],"dc:date.issued":["2001"],"dc:description":["Thesis (Ph. 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While no absorption features were detected, a method of constraining the IGM via the X-ray forest theory was proposed. I also discuss constraining the IGM via the X-ray Gunn-Peterson test."],"dc:description.degree":["Ph.D."],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["http://hdl.handle.net/1721.1/8284"],"dc:language.iso":["eng"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"dc:rights.uri":["http://dspace.mit.edu/handle/1721.1/7582"],"dc:subject":["Physics."],"dc:title":["X-ray absorption by the intergalactic medium"],"dc:type":["Thesis"]},"updated_at":"2026-07-22T22:22:01Z"}