{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/125659"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/125659","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Unveiling gravitationally lensed, high-redshift dusty star forming galaxies with JWST","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","abstract_has_math":false,"creators":["Phadke, Kedar A."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Astronomy","degree_department":null,"school":null,"contributors":["Vieira, Joaquin D","Menanteau, Felipe","Ricker, Paul","Wong, Tony"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-05-14","date_published":"2024-05-14","updated_at":"2026-07-22T22:25:02Z","subjects":["Dusty Star Forming Galaxies","Jwst","High-redshift Galaxies"],"languages":["en","eng"],"rights":["© 2024 Kedar A. Phadke"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/125659","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Vieira, Joaquin D","Menanteau, Felipe","Ricker, Paul","Wong, Tony"]},{"key":"dc:creator","label":"Author","values":["Phadke, Kedar A."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2024-05-14","2024-08"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"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":["Dusty Star Forming Galaxies","Jwst","High-redshift Galaxies"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["© 2024 Kedar A. Phadke"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/125659"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","The student, Kedar Phadke, accepted the attached license on 2024-05-13 at 12:35.","The student, Kedar Phadke, submitted this Dissertation for approval on 2024-05-13 at 12:45.","This Dissertation was approved for publication on 2024-05-14 at 14:09.","DSpace SAF Submission Ingestion Package generated from Vireo submission #20792 on 2025-02-04 at 21:15:33","Dust is an important ingredient in galaxy evolution. Dusty star-forming galaxies (DSFGs) have been shown to contribute significantly to the cosmic star formation history. However, their stellar content especially at high redshift has been difficult to observe before the James Webb Space Telescope (JWST) due to the high dust obscuration. Along with most of the sub-fields of astronomy, our understanding of DSFGs is already beginning to change with just two years of JWST’s science data collection. The work presented in this thesis does not even scratch the surface of the capacity JWST has in placing DSFGs in the context of other galaxies. I begin with introducing the parent sample of DSFGs discovered with the South Pole Telescope Sunyaev-Zel’dovich (SPT-SZ) survey. The sample of 81 galaxies was selected on their mm-wavelength emission in cosmic microwave background (CMB) maps and followed up extensively using telescopes like Atacama Pathfinder EXperiment (APEX), Atacama Large Millimeter Array (ALMA), and Australia Telescope Compact Array (ATCA) as well as optical/near-IR telescopes like Hubble Space Telescope (HST), Spitzer, Gemini, and Very Large Telescope (VLT) to reveal their high-redshift and strongly lensed nature. The optical and near-IR imaging is mainly dominated by the foreground lens whereas high resolution sub-millimeter imaging shows galaxy-scale lensed arcs for 90% of the sources. The other 10% are either confirmed protoclusters or candidates. These sources are all luminous infrared galaxies (LIRGs)/ hyper-luminous infrared galaxies (HyLIRGs) in the redshift range of 1.8 to 6.9. I present pre-JWST constraints on active galactic nuclei (AGN) fraction among the full SPT sub-millimeter galaxy (SPT-SMG) sample along with a handful of stellar mass constraints that were possible. Using upper limits from the Wide-field Infrared Survey Explorer (WISE) band 4, I found that the IR luminosity for SPT-SMGs is not dominated by an obscured AGN. The rest of my thesis focuses on my contributions to the JWST -TEMPLATES early release science (ERS) program which includes two sources from the SPT-SMG sample. I describe various data reduction steps for improving the JWST pipeline derived products, specifically for the Mid-Infrared Instrument (MIRI) imaging and medium-resolution spectrometer (MRS) intergral field unit (IFU) data. Methods for reducing the effect of readout noise have been implemented for TEMPLATES-ERS data products and the corresponding cookbooks have been released to the community. Multiple algorithms to remove cosmic ray showers from MIRI MRS data were tested and a cookbook to improve MRS data has also been released. The two SPT-SMGs observed with JWST are found to be close to the main sequence of galaxies. I then present a spatially resolved study of one source: SPT0418-47. Based on Hα and Paα observations, nebular reddening is estimated for the source on scales of around 300 pc. I have compared the attenuation-corrected resolved star-formation rate diagnostics with Paα and IR luminosity for the source. These diagnostics would not have been possible before JWST in a high-redshift DSFG. These observations and this work lays the foundation for similar studies in other sources from the SPT-SMG sample and beyond."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Unveiling gravitationally lensed, high-redshift dusty star forming galaxies with JWST"]}]}],"canonical_facts":{"dc:contributor":["Vieira, Joaquin D","Menanteau, Felipe","Ricker, Paul","Wong, Tony"],"dc:creator":["Phadke, Kedar A."],"dc:date":["2024-05-14","2024-08"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","The student, Kedar Phadke, accepted the attached license on 2024-05-13 at 12:35.","The student, Kedar Phadke, submitted this Dissertation for approval on 2024-05-13 at 12:45.","This Dissertation was approved for publication on 2024-05-14 at 14:09.","DSpace SAF Submission Ingestion Package generated from Vireo submission #20792 on 2025-02-04 at 21:15:33","Dust is an important ingredient in galaxy evolution. Dusty star-forming galaxies (DSFGs) have been shown to contribute significantly to the cosmic star formation history. However, their stellar content especially at high redshift has been difficult to observe before the James Webb Space Telescope (JWST) due to the high dust obscuration. Along with most of the sub-fields of astronomy, our understanding of DSFGs is already beginning to change with just two years of JWST’s science data collection. The work presented in this thesis does not even scratch the surface of the capacity JWST has in placing DSFGs in the context of other galaxies. I begin with introducing the parent sample of DSFGs discovered with the South Pole Telescope Sunyaev-Zel’dovich (SPT-SZ) survey. The sample of 81 galaxies was selected on their mm-wavelength emission in cosmic microwave background (CMB) maps and followed up extensively using telescopes like Atacama Pathfinder EXperiment (APEX), Atacama Large Millimeter Array (ALMA), and Australia Telescope Compact Array (ATCA) as well as optical/near-IR telescopes like Hubble Space Telescope (HST), Spitzer, Gemini, and Very Large Telescope (VLT) to reveal their high-redshift and strongly lensed nature. The optical and near-IR imaging is mainly dominated by the foreground lens whereas high resolution sub-millimeter imaging shows galaxy-scale lensed arcs for 90% of the sources. The other 10% are either confirmed protoclusters or candidates. These sources are all luminous infrared galaxies (LIRGs)/ hyper-luminous infrared galaxies (HyLIRGs) in the redshift range of 1.8 to 6.9. I present pre-JWST constraints on active galactic nuclei (AGN) fraction among the full SPT sub-millimeter galaxy (SPT-SMG) sample along with a handful of stellar mass constraints that were possible. Using upper limits from the Wide-field Infrared Survey Explorer (WISE) band 4, I found that the IR luminosity for SPT-SMGs is not dominated by an obscured AGN. The rest of my thesis focuses on my contributions to the JWST -TEMPLATES early release science (ERS) program which includes two sources from the SPT-SMG sample. I describe various data reduction steps for improving the JWST pipeline derived products, specifically for the Mid-Infrared Instrument (MIRI) imaging and medium-resolution spectrometer (MRS) intergral field unit (IFU) data. Methods for reducing the effect of readout noise have been implemented for TEMPLATES-ERS data products and the corresponding cookbooks have been released to the community. Multiple algorithms to remove cosmic ray showers from MIRI MRS data were tested and a cookbook to improve MRS data has also been released. The two SPT-SMGs observed with JWST are found to be close to the main sequence of galaxies. I then present a spatially resolved study of one source: SPT0418-47. Based on Hα and Paα observations, nebular reddening is estimated for the source on scales of around 300 pc. I have compared the attenuation-corrected resolved star-formation rate diagnostics with Paα and IR luminosity for the source. These diagnostics would not have been possible before JWST in a high-redshift DSFG. These observations and this work lays the foundation for similar studies in other sources from the SPT-SMG sample and beyond."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/125659"],"dc:language":["en","eng"],"dc:rights":["© 2024 Kedar A. Phadke"],"dc:subject":["Dusty Star Forming Galaxies","Jwst","High-redshift Galaxies"],"dc:title":["Unveiling gravitationally lensed, high-redshift dusty star forming galaxies with JWST"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Astronomy"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:02Z"}