{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19400"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19400","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Interferometric studies of 3 millimeter continuum and molecular lines in the giant molecular cloud Sagittarius B2","abstract":"The giant molecular cloud Sagittarius B2 is known for its active role in chemical evolution, massive star formation, and complex kinematic structure. Studies of the 3 mm continuum and the transitions of various molecular species are essential in understanding not only the chemical evolution but also the physical and kinematic structure of the Sgr B2 cloud. In this study, the high-resolution full synthesis observations of HNO, CCS and HC$\\sp{13}$CCN, and BIMA array observations of C$\\sp{18}$O, OCS, HNCO, NH$\\sb2$CHO, and HCOOCH$\\sb3$ in the Sgr B2 cloud are presented. By utilizing the distinct physical and chemical characteristics of different molecular transitions of various species, we were able to study the physical and chemical properties of the Sgr B2 cloud. In total, 13 transitions of 8 different molecules were observed. In addition, 3-mm continuum emission at 78.5, 81.5, 84.9, 87.9, 106.9 and 109.9 GHz was also observed. Our studies are essential for understanding the behavior of nitrogen-bearing molecules and are important for establishing observational constraints for the astrochemical models involving nitrogen compounds. Our data also support the existence of core-mantle grains and demonstrate their close relationship with the formation of large complex molecules.","abstract_html":"The giant molecular cloud Sagittarius B2 is known for its active role in chemical evolution, massive star formation, and complex kinematic structure. Studies of the 3 mm continuum and the transitions of various molecular species are essential in understanding not only the chemical evolution but also the physical and kinematic structure of the Sgr B2 cloud. In this study, the high-resolution full synthesis observations of HNO, CCS and HC$\\sp{13}$CCN, and BIMA array observations of C$\\sp{18}$O, OCS, HNCO, NH$\\sb2$CHO, and HCOOCH$\\sb3$ in the Sgr B2 cloud are presented. By utilizing the distinct physical and chemical characteristics of different molecular transitions of various species, we were able to study the physical and chemical properties of the Sgr B2 cloud. In total, 13 transitions of 8 different molecules were observed. In addition, 3-mm continuum emission at 78.5, 81.5, 84.9, 87.9, 106.9 and 109.9 GHz was also observed. Our studies are essential for understanding the behavior of nitrogen-bearing molecules and are important for establishing observational constraints for the astrochemical models involving nitrogen compounds. Our data also support the existence of core-mantle grains and demonstrate their close relationship with the formation of large complex molecules.","abstract_has_math":true,"creators":["Kuan, Yi-Jehng"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Astronomy","degree_department":null,"school":null,"contributors":["Snyder, Lewis E."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:06:21Z","date_published":"2011-05-07T12:06:21Z","updated_at":"2026-07-22T22:25:12Z","subjects":["Physics, Astronomy and Astrophysics"],"languages":["eng"],"rights":["Copyright 1995 Kuan, Yi-Jehng"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9522132","(UMI)AAI9522132"],"render_values":[{"text":"AAI9522132","href":null,"code":true},{"text":"(UMI)AAI9522132","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19400","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Snyder, Lewis E."]},{"key":"dc:creator","label":"Author","values":["Kuan, Yi-Jehng"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:06:21Z","10000-01-01","1995"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Astronomy"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Astronomy and Astrophysics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1995 Kuan, Yi-Jehng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9522132","(UMI)AAI9522132","http://hdl.handle.net/2142/19400"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The giant molecular cloud Sagittarius B2 is known for its active role in chemical evolution, massive star formation, and complex kinematic structure. Studies of the 3 mm continuum and the transitions of various molecular species are essential in understanding not only the chemical evolution but also the physical and kinematic structure of the Sgr B2 cloud. In this study, the high-resolution full synthesis observations of HNO, CCS and HC$\\sp{13}$CCN, and BIMA array observations of C$\\sp{18}$O, OCS, HNCO, NH$\\sb2$CHO, and HCOOCH$\\sb3$ in the Sgr B2 cloud are presented. By utilizing the distinct physical and chemical characteristics of different molecular transitions of various species, we were able to study the physical and chemical properties of the Sgr B2 cloud. In total, 13 transitions of 8 different molecules were observed. In addition, 3-mm continuum emission at 78.5, 81.5, 84.9, 87.9, 106.9 and 109.9 GHz was also observed. Our studies are essential for understanding the behavior of nitrogen-bearing molecules and are important for establishing observational constraints for the astrochemical models involving nitrogen compounds. Our data also support the existence of core-mantle grains and demonstrate their close relationship with the formation of large complex molecules.","Made available in DSpace on 2011-05-07T12:06:21Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9522132.pdf: 10913194 bytes, checksum: 7de1c98577ed455822e0064604fd1537 (MD5) Previous issue date: 1995","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:36:42Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:14:55-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Interferometric studies of 3 millimeter continuum and molecular lines in the giant molecular cloud Sagittarius B2"]}]}],"canonical_facts":{"dc:contributor":["Snyder, Lewis E."],"dc:creator":["Kuan, Yi-Jehng"],"dc:date":["2011-05-07T12:06:21Z","10000-01-01","1995"],"dc:description":["The giant molecular cloud Sagittarius B2 is known for its active role in chemical evolution, massive star formation, and complex kinematic structure. Studies of the 3 mm continuum and the transitions of various molecular species are essential in understanding not only the chemical evolution but also the physical and kinematic structure of the Sgr B2 cloud. In this study, the high-resolution full synthesis observations of HNO, CCS and HC$\\sp{13}$CCN, and BIMA array observations of C$\\sp{18}$O, OCS, HNCO, NH$\\sb2$CHO, and HCOOCH$\\sb3$ in the Sgr B2 cloud are presented. By utilizing the distinct physical and chemical characteristics of different molecular transitions of various species, we were able to study the physical and chemical properties of the Sgr B2 cloud. In total, 13 transitions of 8 different molecules were observed. In addition, 3-mm continuum emission at 78.5, 81.5, 84.9, 87.9, 106.9 and 109.9 GHz was also observed. Our studies are essential for understanding the behavior of nitrogen-bearing molecules and are important for establishing observational constraints for the astrochemical models involving nitrogen compounds. Our data also support the existence of core-mantle grains and demonstrate their close relationship with the formation of large complex molecules.","Made available in DSpace on 2011-05-07T12:06:21Z (GMT). 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