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New Frontiers in Extragalactic Stellar Metallicity Measurements With Hubble Space Telescope
New Frontiers in Extragalactic Stellar Metallicity Measurements With Hubble Space Telescope
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104815
- ISBN
- 9798293893102
- DDC
- 520
- 저자명
- Fu, Sal Wanying.
- 서명/저자
- New Frontiers in Extragalactic Stellar Metallicity Measurements With Hubble Space Telescope
- 발행사항
- [Sl] : University of California, Berkeley, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 239 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Weisz, Daniel R.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Berkeley, 2025.
- 초록/해제
- 요약Detailed studies of our Local Group benchmark our understanding of galaxy formation. Stellar metallicities are key tracers of the baryonic astrophysics shaping galactic properties, but they are challenging to measure in distant and faint galaxies. Narrow-band imaging offers a powerful way to measure stellar metallicities in systems that push our understanding of dwarf galaxy formation to new regimes in luminosity, star formation history, and environment. In this dissertation, I present hundreds of new stellar metallicities in faint, Local Group dwarf galaxies measured via a novel application of Ca H&K imaging on the Hubble Space Telescope. These metallicities measurements encompass: 1) 463 stars in 13 ultra-faint dwarf galaxies (UFDs) around the Milky Way, which effectively doubles the number of stellar metallicities in all known UFDs, b) 374 stellar metallicities in the quenched field dwarf galaxy Tucana (Mv = -8.8, D ~ 1 Mpc), a factor of ~7 increase over literature spectroscopy, and c) 286 stellar metallicities in two M31 dwarfs Andromeda XVI and And XXVIII where there were previously 0 and 13, respectively. These homogeneous metallicity measurements enable a wide range of science: 1) chemical evolution modeling to put novel constraints on the baryon cycle in UFDs, 2) new metallicity benchmarks for cosmological simulations of the faintest galaxies, 3) high-fidelity metallicity gradients that constrain stellar feedback and dark matter core formation models in dwarf galaxies, 4) ~120 Extremely Metal Poor (EMP; [Fe/H] -3.0) star candidates that will be priority spectroscopic follow-up targets in the era of Extremely Large Telescopes (ELTs). I conclude with a discussion of interpretive and observational studies that follow from this dissertation.
- 일반주제명
- Astronomy
- 일반주제명
- Applied physics
- 키워드
- Galaxy formation
- 기타저자
- University of California, Berkeley Astrophysics
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017358958
■00520260202104815
■006m o d
■007cr#unu||||||||
■020 ▼a9798293893102
■035 ▼a(MiAaPQ)AAI32168094
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a520
■1001 ▼aFu, Sal Wanying.
■24510▼aNew Frontiers in Extragalactic Stellar Metallicity Measurements With Hubble Space Telescope
■260 ▼a[Sl]▼bUniversity of California, Berkeley▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a239 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Weisz, Daniel R.
■5021 ▼aThesis (Ph.D.)--University of California, Berkeley, 2025.
■520 ▼aDetailed studies of our Local Group benchmark our understanding of galaxy formation. Stellar metallicities are key tracers of the baryonic astrophysics shaping galactic properties, but they are challenging to measure in distant and faint galaxies. Narrow-band imaging offers a powerful way to measure stellar metallicities in systems that push our understanding of dwarf galaxy formation to new regimes in luminosity, star formation history, and environment. In this dissertation, I present hundreds of new stellar metallicities in faint, Local Group dwarf galaxies measured via a novel application of Ca H&K imaging on the Hubble Space Telescope. These metallicities measurements encompass: 1) 463 stars in 13 ultra-faint dwarf galaxies (UFDs) around the Milky Way, which effectively doubles the number of stellar metallicities in all known UFDs, b) 374 stellar metallicities in the quenched field dwarf galaxy Tucana (Mv = -8.8, D ~ 1 Mpc), a factor of ~7 increase over literature spectroscopy, and c) 286 stellar metallicities in two M31 dwarfs Andromeda XVI and And XXVIII where there were previously 0 and 13, respectively. These homogeneous metallicity measurements enable a wide range of science: 1) chemical evolution modeling to put novel constraints on the baryon cycle in UFDs, 2) new metallicity benchmarks for cosmological simulations of the faintest galaxies, 3) high-fidelity metallicity gradients that constrain stellar feedback and dark matter core formation models in dwarf galaxies, 4) ~120 Extremely Metal Poor (EMP; [Fe/H] -3.0) star candidates that will be priority spectroscopic follow-up targets in the era of Extremely Large Telescopes (ELTs). I conclude with a discussion of interpretive and observational studies that follow from this dissertation.
■590 ▼aSchool code: 0028.
■650 4▼aAstronomy
■650 4▼aApplied physics
■653 ▼aGalaxy formation
■653 ▼aStellar metallicities
■653 ▼aExtremely Large Telescopes
■690 ▼a0606
■690 ▼a0215
■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=T17358958▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
