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Toward a Physical Understanding of the Dynamic Circumgalactic Medium
Toward a Physical Understanding of the Dynamic Circumgalactic Medium
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152643
- ISBN
- 9798384010586
- DDC
- 520
- 저자명
- Chen, Cuncheng.
- 서명/저자
- Toward a Physical Understanding of the Dynamic Circumgalactic Medium
- 발행사항
- [Sl] : The University of Chicago, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 205 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
- 주기사항
- Advisor: Chen, Hsiao-Wen.
- 학위논문주기
- Thesis (Ph.D.)--The University of Chicago, 2024.
- 초록/해제
- 요약The circumgalactic medium (CGM) is the outermost, gaseous envelope of a galaxy, spanning beyond the visible stellar disk and dominating the galaxy's baryonic mass. This expansive gas reservoir plays an influential role in cosmic structure formation and records critical information about a galaxy's past and ongoing interactions with the surrounding environment. Understanding the detailed physical properties of the CGM is a vital step to improving the current galaxy evolution theories. In particular, evidence has been mounting that the ebbs and flows of baryonic matter in the CGM play a crucial role in driving galaxy formation, maturation, and eventual quiescence. While recent CGM surveys have significantly tightened constraints on the spatial extent and column density of the gas, our direct observations of gas motions remain notably limited. In this thesis, I leveraged the exquisite sensitivity of the latest generation of integral-field spectrographs to provide empirical constraints on two key dynamical processes in the CGM: galactic superwinds driven by star-forming galaxies and the subsonic turbulent energy cascade in the low-density halo environment. Taking advantage of the magnifying power of strong gravitational lensing and employing Lyman-alpha radiative transfer models, I recovered highly organized velocity fields across galactic outflow regions at scales of ≈ 5--30 kpc surrounding star-forming galaxies at z ≈ 3--4 (Chapter 2). Utilizing two-point statistical analyses derived from the spatially-resolved kinematic measures, I uncovered the subsonic nature of gas motions at scales of ≈10--60 kpc in the quasar CGM at z ≈ 0.5--1 (Chapters 3 and 4). These empirical results shed light on the intimate connection between galaxies and their surrounding CGM, illuminating the role of star-formation/AGN feedback and galaxy environments on the evolution of the baryon cycle over cosmic time.
- 일반주제명
- Astronomy
- 일반주제명
- Astrophysics
- 일반주제명
- Atmospheric sciences
- 키워드
- Baryon cycle
- 키워드
- Galaxy evolution
- 기타저자
- The University of Chicago Astronomy and Astrophysics
- 기본자료저록
- Dissertations Abstracts International. 86-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152643
■006m o d
■007cr#unu||||||||
■020 ▼a9798384010586
■035 ▼a(MiAaPQ)AAI31485501
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a520
■1001 ▼aChen, Cuncheng.▼0(orcid)0000-0002-8739-3163
■24510▼aToward a Physical Understanding of the Dynamic Circumgalactic Medium
■260 ▼a[Sl]▼bThe University of Chicago▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a205 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-02, Section: B.
■500 ▼aAdvisor: Chen, Hsiao-Wen.
■5021 ▼aThesis (Ph.D.)--The University of Chicago, 2024.
■520 ▼aThe circumgalactic medium (CGM) is the outermost, gaseous envelope of a galaxy, spanning beyond the visible stellar disk and dominating the galaxy's baryonic mass. This expansive gas reservoir plays an influential role in cosmic structure formation and records critical information about a galaxy's past and ongoing interactions with the surrounding environment. Understanding the detailed physical properties of the CGM is a vital step to improving the current galaxy evolution theories. In particular, evidence has been mounting that the ebbs and flows of baryonic matter in the CGM play a crucial role in driving galaxy formation, maturation, and eventual quiescence. While recent CGM surveys have significantly tightened constraints on the spatial extent and column density of the gas, our direct observations of gas motions remain notably limited. In this thesis, I leveraged the exquisite sensitivity of the latest generation of integral-field spectrographs to provide empirical constraints on two key dynamical processes in the CGM: galactic superwinds driven by star-forming galaxies and the subsonic turbulent energy cascade in the low-density halo environment. Taking advantage of the magnifying power of strong gravitational lensing and employing Lyman-alpha radiative transfer models, I recovered highly organized velocity fields across galactic outflow regions at scales of ≈ 5--30 kpc surrounding star-forming galaxies at z ≈ 3--4 (Chapter 2). Utilizing two-point statistical analyses derived from the spatially-resolved kinematic measures, I uncovered the subsonic nature of gas motions at scales of ≈10--60 kpc in the quasar CGM at z ≈ 0.5--1 (Chapters 3 and 4). These empirical results shed light on the intimate connection between galaxies and their surrounding CGM, illuminating the role of star-formation/AGN feedback and galaxy environments on the evolution of the baryon cycle over cosmic time.
■590 ▼aSchool code: 0330.
■650 4▼aAstronomy
■650 4▼aAstrophysics
■650 4▼aAtmospheric sciences
■653 ▼aBaryon cycle
■653 ▼aCircumgalactic medium
■653 ▼aGalaxy evolution
■653 ▼aStar-forming galaxies
■653 ▼aQuasi-stellar objects
■690 ▼a0606
■690 ▼a0596
■690 ▼a0725
■71020▼aThe University of Chicago▼bAstronomy and Astrophysics.
■7730 ▼tDissertations Abstracts International▼g86-02B.
■790 ▼a0330
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163248▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
