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Applications of Strong Gravitational Lensing by Galaxy Clusters to Star Formation and Cosmology.
Applications of Strong Gravitational Lensing by Galaxy Clusters to Star Formation and Cosmology.
상세정보
- 자료유형
- 학위논문(국외)
- 기본표목-개인명
- 표제와 책임표시사항
- Applications of Strong Gravitational Lensing by Galaxy Clusters to Star Formation and Cosmology.
- 발행, 배포, 간사 사항
- 발행, 배포, 간사 사항
- 형태사항
- 270 p.
- 일반주기
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 일반주기
- Advisor: Dai, Liang;Lu, Wenbin.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Berkeley, 2025.
- 요약 등 주기
- 요약Strong gravitational lensing of distant background galaxies into magnified multiple-images by foreground galaxy clusters presents a number of exciting opportunities for observational astrophysics. This thesis concerns two primary applications of this observed consequence of Einstein's general relativity.Using multiply-imaged galaxies as constraints, this thesis models the mass distributions of two galaxy clusters. Combining these mass models with ground- and space-based data we determine these clusters are likely recent mergers, and may be useful for detecting transient lensed stars. Leveraging the achromatic magnification provided by strong lensing, this thesis also studies the z=2.37 Sunburst galaxy, focusing on two young massive star clusters which are bright and resolved from other star-forming regions in the galaxy due to lensing. Photoionization modeling with joint photo-spectroscopic data of these clusters reveal they host nebulae with unusual abundance patterns; both showcasing heavy gas-phase nitrogen enrichment. We investigate the physical origin of these nebulae, and connect these unusual abundances to the puzzle of multiple stellar populations in globular clusters. This thesis also analyzes the z=1.78 SN H0pe, which is triply-imaged due to strong gravitational lensing. JWST observations of all three SN images confirmed the Ia typing, and enabled photometric and rare spectroscopic measurements of the two relative time delays. Synthesizing these measured delays with strong-lensing mass models yields a value for the Hubble-Lemaitre constant (H0). Crucially, the lensing magnification obtained from the standard candle augments this inference, breaking strong-lensing degeneracies. Following strict double-blinded protocols, these two measured time delays and three measured magnifications were compared to the predictions of seven independently constructed cluster strong-lensing models to measure H0 to $10\\%$ uncertainty.Finally, this thesis revisits the enigmatic, Earendel, a lensed star candidate in the z=6 Sunrise galaxy. Using JWST spectroscopy, we evaluate Earendel's likelihood as a star cluster rather an an individual star or binary. We find the spectrum to be highly consistent with a star cluster, and moreover find that Earendel, as well as another star cluster within the Sunrise, are consistent with the formation age-metallicity expectations for intermediate age star clusters in the first billion years of the universe.
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 비통제 색인어
- 비통제 색인어
- 비통제 색인어
- 비통제 색인어
- 비통제 색인어
- 부출표목-단체명
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 원문정보보기
MARC
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■020 ▼a9798293892648
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■040 ▼aMiAaPQ▼cMiAaPQ
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■1001 ▼aPascale, Massimo.
■24510▼aApplications of Strong Gravitational Lensing by Galaxy Clusters to Star Formation and Cosmology.
■260 ▼a[S.l.]▼bUniversity of California, Berkeley. ▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a270 p.
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Dai, Liang;Lu, Wenbin.
■5021 ▼aThesis (Ph.D.)--University of California, Berkeley, 2025.
■520 ▼aStrong gravitational lensing of distant background galaxies into magnified multiple-images by foreground galaxy clusters presents a number of exciting opportunities for observational astrophysics. This thesis concerns two primary applications of this observed consequence of Einstein's general relativity.Using multiply-imaged galaxies as constraints, this thesis models the mass distributions of two galaxy clusters. Combining these mass models with ground- and space-based data we determine these clusters are likely recent mergers, and may be useful for detecting transient lensed stars. Leveraging the achromatic magnification provided by strong lensing, this thesis also studies the z=2.37 Sunburst galaxy, focusing on two young massive star clusters which are bright and resolved from other star-forming regions in the galaxy due to lensing. Photoionization modeling with joint photo-spectroscopic data of these clusters reveal they host nebulae with unusual abundance patterns; both showcasing heavy gas-phase nitrogen enrichment. We investigate the physical origin of these nebulae, and connect these unusual abundances to the puzzle of multiple stellar populations in globular clusters. This thesis also analyzes the z=1.78 SN H0pe, which is triply-imaged due to strong gravitational lensing. JWST observations of all three SN images confirmed the Ia typing, and enabled photometric and rare spectroscopic measurements of the two relative time delays. Synthesizing these measured delays with strong-lensing mass models yields a value for the Hubble-Lemaitre constant (H0). Crucially, the lensing magnification obtained from the standard candle augments this inference, breaking strong-lensing degeneracies. Following strict double-blinded protocols, these two measured time delays and three measured magnifications were compared to the predictions of seven independently constructed cluster strong-lensing models to measure H0 to $10\\%$ uncertainty.Finally, this thesis revisits the enigmatic, Earendel, a lensed star candidate in the z=6 Sunrise galaxy. Using JWST spectroscopy, we evaluate Earendel's likelihood as a star cluster rather an an individual star or binary. We find the spectrum to be highly consistent with a star cluster, and moreover find that Earendel, as well as another star cluster within the Sunrise, are consistent with the formation age-metallicity expectations for intermediate age star clusters in the first billion years of the universe.
■590 ▼aSchool code: 0028.
■650 4▼aAstrophysics.
■650 4▼aAstronomy.
■650 4▼aPlanetology.
■653 ▼aStar formation
■653 ▼aCosmology
■653 ▼aGalaxy clusters
■653 ▼aStar clusters
■653 ▼aStellar populations
■690 ▼a0596
■690 ▼a0606
■690 ▼a0590
■71020▼aUniversity of California, Berkeley▼bAstrophysics.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0028
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359357▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
