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The Chemical Enrichment of the Local Universe- [electronic resource]
![The Chemical Enrichment of the Local Universe - [electronic resource]](/Users/Baul/Images/book.png)
The Chemical Enrichment of the Local Universe- [electronic resource]
상세정보
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214101642
- ISBN
- 9798380394376
- DDC
- 523
- 서명/저자
- The Chemical Enrichment of the Local Universe - [electronic resource]
- 발행사항
- [S.l.]: : University of Minnesota., 2023
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- 형태사항
- 1 online resource(227 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-03, Section: A.
- 주기사항
- Advisor: Skillman, Evan D.
- 학위논문주기
- Thesis (Ph.D.)--University of Minnesota, 2023.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 요약Gas-phase chemical abundances are powerful probes of galactic evolutionary mechanisms: the Interstellar Medium is enriched with the products of stellar nucleosynthesis, diluted by pristine gas infall, and mixed by various processes on different timescales. A significant sample of chemical abundances offers insight into these processes and the products of star formation. This work has produced such a sample to study the chemical evolution of metal-poor, low-mass dwarf galaxies and metal-rich spiral galaxies. The chemical abundances in two such spirals, NGC 2403 and M33, reveal that these systems are chemically enriched from the inside out and have small dispersions about their abundance gradients. Electron temperature measurements in multiple ionization zones are required to accurately constrain the chemical abundance of an H II region, and it is shown that a lack of temperature data can significantly inflate the variation in O/H within a spiral galaxy. While local spirals provide the best laboratories to study chemical enrichment on small spatial scales, dwarf galaxies are more comparable to the highly star-forming, low-mass systems in the early universe. New UV spectroscopy of the dwarf galaxy Pox 186 enables a robust calculation of the C/O abundance, stellar population parameters, and ionizing conditions in a system analogous to those at high redshift. The measured C/O abundance suggests a star-formation history similar to other more massive dwarf galaxies; however, the observed very high-ionization emission features imply that the ionization conditions in Pox 186 and reionization-era galaxies are sensitive to the recent formation of very massive stars.
- 일반주제명
- Astrophysics.
- 일반주제명
- Astronomy.
- 일반주제명
- Metaphysics.
- 키워드
- Gas
- 키워드
- Universe
- 키워드
- Galaxies
- 키워드
- Spirals
- 키워드
- Star formation
- 기타저자
- University of Minnesota Physics
- 기본자료저록
- Dissertations Abstracts International. 85-03A.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520240214101642
■006m o d
■007cr#unu||||||||
■020 ▼a9798380394376
■035 ▼a(MiAaPQ)AAI30632907
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aRogers, Noah S. J.
■24510▼aThe Chemical Enrichment of the Local Universe▼h[electronic resource]
■260 ▼a[S.l.]:▼bUniversity of Minnesota. ▼c2023
■260 1▼aAnn Arbor :▼bProQuest Dissertations & Theses, ▼c2023
■300 ▼a1 online resource(227 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-03, Section: A.
■500 ▼aAdvisor: Skillman, Evan D.
■5021 ▼aThesis (Ph.D.)--University of Minnesota, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aGas-phase chemical abundances are powerful probes of galactic evolutionary mechanisms: the Interstellar Medium is enriched with the products of stellar nucleosynthesis, diluted by pristine gas infall, and mixed by various processes on different timescales. A significant sample of chemical abundances offers insight into these processes and the products of star formation. This work has produced such a sample to study the chemical evolution of metal-poor, low-mass dwarf galaxies and metal-rich spiral galaxies. The chemical abundances in two such spirals, NGC 2403 and M33, reveal that these systems are chemically enriched from the inside out and have small dispersions about their abundance gradients. Electron temperature measurements in multiple ionization zones are required to accurately constrain the chemical abundance of an H II region, and it is shown that a lack of temperature data can significantly inflate the variation in O/H within a spiral galaxy. While local spirals provide the best laboratories to study chemical enrichment on small spatial scales, dwarf galaxies are more comparable to the highly star-forming, low-mass systems in the early universe. New UV spectroscopy of the dwarf galaxy Pox 186 enables a robust calculation of the C/O abundance, stellar population parameters, and ionizing conditions in a system analogous to those at high redshift. The measured C/O abundance suggests a star-formation history similar to other more massive dwarf galaxies; however, the observed very high-ionization emission features imply that the ionization conditions in Pox 186 and reionization-era galaxies are sensitive to the recent formation of very massive stars.
■590 ▼aSchool code: 0130.
■650 4▼aAstrophysics.
■650 4▼aAstronomy.
■650 4▼aMetaphysics.
■653 ▼aChemical abundances
■653 ▼aChemical enrichment
■653 ▼aGas
■653 ▼aUniverse
■653 ▼aGalaxies
■653 ▼aSpirals
■653 ▼aStar formation
■690 ▼a0596
■690 ▼a0606
■690 ▼a0396
■71020▼aUniversity of Minnesota▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g85-03A.
■773 ▼tDissertation Abstract International
■790 ▼a0130
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16934686▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
