서브메뉴
검색
Stars in the Balance: The Connection Between Stellar Feedback, Galactic Disk Emergence, and the Applicability of Equilibrium Models of Star Formation- [electronic resource]
Stars in the Balance: The Connection Between Stellar Feedback, Galactic Disk Emergence, and the Applicability of Equilibrium Models of Star Formation- [electronic resource]
상세정보
- Material Type
- 학위논문
- 0016933132
- Date and Time of Latest Transaction
- 20240214101207
- ISBN
- 9798380146449
- DDC
- 520
- Author
- Gurvich, Alexander Barratt.
- Title/Author
- Stars in the Balance: The Connection Between Stellar Feedback, Galactic Disk Emergence, and the Applicability of Equilibrium Models of Star Formation - [electronic resource]
- Publish Info
- [S.l.] : Northwestern University., 2023
- Publish Info
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- Material Info
- 1 online resource(225 p.)
- General Note
- Source: Dissertations Abstracts International, Volume: 85-02, Section: B.
- General Note
- Advisor: Faucher-Giguere, Claude-Andre.
- 학위논문주기
- Thesis (Ph.D.)--Northwestern University, 2023.
- Restrictions on Access Note
- This item must not be sold to any third party vendors.
- Abstracts/Etc
- 요약Equilibrium models of star formation successfully derive the globally-averaged Kennicutt-Schmidt (KS) relation, positing that star formation rates (SFRs) are self- regulated by the turbulence in the interstellar medium (ISM) generated by stellar feedback. However, these models make assumptions that may not be achieved in realistic galaxy systems. Cosmological zoom-in simulations, such as the FIRE-2 simulations, are ideal laboratories for testing these models, as they resolve individual star-forming regions and include detailed models for multi-channel stellar feedback, producing realistic galaxies from cosmological initial conditions derived from observed statistics of the cosmic microwave background. Analysis of a sample of FIRE-2 galaxies at z = 0 reveals that while most assumptions underlying equilibrium models are realized, there are key caveats including the existence of fountain flows, a highly multi-phase medium whose composition varies with height, and the importance of thermal and bulk flow pressures in addition to the turbulent pressure.On the other hand, the theory of bursty star formation, a generic prediction for dwarf galaxies in simulations which resolve individual star-forming regions and include explicit models for stellar feedback, has been less studied than time-steady SFRs. Bursty star formation is not only a model prediction but is also supported by measurement of star formation rates on different timescales in dwarf galaxies (e.g. using Hα and continuum UV light). The FIRE simulations predict that massive disk galaxies at z = 0 transition from a bursty phase to a time-steady phase earlier in their formation histories. Thus, the evolution of galaxies in the FIRE simulations which undergo such a transition presents a unique opportunity to better understand the processes regulating star formation. Analysis of the same sample of FIRE-2 simulations shows a 1-1 connection between the existence of a galactic disk and the time-steady character of star formation, with the emergence of a stable disk occurring rapidly after the physical conditions for stability are met.Due to the complexity of the simulation output and the required analyses, building intuition for results from cosmological simulations required the development of a new tool for interactively exploring data, Firefly. Firefly is a browser-based interactive visualization software that addresses challenges in traditional pre-rendered visualization. It allows users to pan, rotate, and zoom the camera in a 3D scene, while adjusting filters, colors, and scales of data points- interactively rendering the scene for up to tens of millions of data-points on a typical consumer-grade laptop. Firefly is also optimized for even larger datasets by progressively loading data on-demand, making it suitable for extremely large datasets such as Gaia DR3 which contains the positions of 1.5 billion stars in the Milky Way. These advances will enable the analysis of increasingly large and complex data in the future.
- Subject Added Entry-Topical Term
- Astronomy.
- Subject Added Entry-Topical Term
- Aeronomy.
- Index Term-Uncontrolled
- Data visualization
- Index Term-Uncontrolled
- Disk settling
- Index Term-Uncontrolled
- Galaxy formation
- Index Term-Uncontrolled
- Stellar feedback
- Added Entry-Corporate Name
- Northwestern University Physics and Astronomy
- Host Item Entry
- Dissertations Abstracts International. 85-02B.
- Host Item Entry
- Dissertation Abstract International
- Electronic Location and Access
- 로그인을 한후 보실 수 있는 자료입니다.
- 소장사항
-
202402 2024
- Control Number
- joongbu:639216
MARC
008240219s2023 ulk 00 kor■001000016933132
■00520240214101207
■006m o d
■007cr#unu||||||||
■020 ▼a9798380146449
■035 ▼a(MiAaPQ)AAI30525207
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a520
■1001 ▼aGurvich, Alexander Barratt.▼0(orcid)0000-0002-6145-3674
■24510▼aStars in the Balance: The Connection Between Stellar Feedback, Galactic Disk Emergence, and the Applicability of Equilibrium Models of Star Formation▼h[electronic resource]
■260 ▼a[S.l.]▼bNorthwestern University. ▼c2023
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2023
■300 ▼a1 online resource(225 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-02, Section: B.
■500 ▼aAdvisor: Faucher-Giguere, Claude-Andre.
■5021 ▼aThesis (Ph.D.)--Northwestern University, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aEquilibrium models of star formation successfully derive the globally-averaged Kennicutt-Schmidt (KS) relation, positing that star formation rates (SFRs) are self- regulated by the turbulence in the interstellar medium (ISM) generated by stellar feedback. However, these models make assumptions that may not be achieved in realistic galaxy systems. Cosmological zoom-in simulations, such as the FIRE-2 simulations, are ideal laboratories for testing these models, as they resolve individual star-forming regions and include detailed models for multi-channel stellar feedback, producing realistic galaxies from cosmological initial conditions derived from observed statistics of the cosmic microwave background. Analysis of a sample of FIRE-2 galaxies at z = 0 reveals that while most assumptions underlying equilibrium models are realized, there are key caveats including the existence of fountain flows, a highly multi-phase medium whose composition varies with height, and the importance of thermal and bulk flow pressures in addition to the turbulent pressure.On the other hand, the theory of bursty star formation, a generic prediction for dwarf galaxies in simulations which resolve individual star-forming regions and include explicit models for stellar feedback, has been less studied than time-steady SFRs. Bursty star formation is not only a model prediction but is also supported by measurement of star formation rates on different timescales in dwarf galaxies (e.g. using Hα and continuum UV light). The FIRE simulations predict that massive disk galaxies at z = 0 transition from a bursty phase to a time-steady phase earlier in their formation histories. Thus, the evolution of galaxies in the FIRE simulations which undergo such a transition presents a unique opportunity to better understand the processes regulating star formation. Analysis of the same sample of FIRE-2 simulations shows a 1-1 connection between the existence of a galactic disk and the time-steady character of star formation, with the emergence of a stable disk occurring rapidly after the physical conditions for stability are met.Due to the complexity of the simulation output and the required analyses, building intuition for results from cosmological simulations required the development of a new tool for interactively exploring data, Firefly. Firefly is a browser-based interactive visualization software that addresses challenges in traditional pre-rendered visualization. It allows users to pan, rotate, and zoom the camera in a 3D scene, while adjusting filters, colors, and scales of data points- interactively rendering the scene for up to tens of millions of data-points on a typical consumer-grade laptop. Firefly is also optimized for even larger datasets by progressively loading data on-demand, making it suitable for extremely large datasets such as Gaia DR3 which contains the positions of 1.5 billion stars in the Milky Way. These advances will enable the analysis of increasingly large and complex data in the future.
■590 ▼aSchool code: 0163.
■650 4▼aAstronomy.
■650 4▼aAeronomy.
■653 ▼aData visualization
■653 ▼aDisk settling
■653 ▼aGalaxy formation
■653 ▼aStellar feedback
■690 ▼a0606
■690 ▼a0367
■71020▼aNorthwestern University▼bPhysics and Astronomy.
■7730 ▼tDissertations Abstracts International▼g85-02B.
■773 ▼tDissertation Abstract International
■790 ▼a0163
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16933132▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
미리보기
내보내기
chatGPT토론
Ai 추천 관련 도서
Detail Info.
- Reservation
- 캠퍼스간 도서대출
- 서가에 없는 책 신고
- My Folder