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Dark Matter Substructure in the Milky Way
Dark Matter Substructure in the Milky Way
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260311091528.5
- ISBN
- 9798270231279
- DDC
- 523
- 저자명
- Kong, Hyunsu
- 서명/저자
- Dark Matter Substructure in the Milky Way / Hyunsu Kong
- 발행사항
- [Sl] : The University of Texas at Austin, 2025
- 형태사항
- 1 electronic resource (109 pages)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisors: Kilic, Can; Boylan-Kolchin, Michael Committee members: Boddy, Kimberly; Bullock, James; Zimmerman, Aaron.
- 학위논문주기
- - Ph.D. : The University of Texas at Austin, 2025.
- 초록/해제
- 요약The standard ΛCDM cosmological model predicts a wealth of small-scale structures, including dark matter subhalos residing within more massive halos such as that of our own Milky Way galaxy. While some of these subhalos may be massive enough to host faint galaxies, smaller ones fall below the threshold of galaxy formation and remain dark. Together, the abundance and survivability of both luminous and dark subhalos offer a powerful test of the ΛCDM paradigm on small scales.Recent observational advances have uncovered a growing population of faint satellite galaxies around the Milky Way, reigniting a longstanding tension. State-of-the-art simulations, when analyzed with conventional halo tracking tools, now predict a subhalo population that is again inconsistent with the observed MW satellite distribution - this time, predicting too few, especially in the inner regions of the host halo. Although several theoretical solutions have been proposed, including star formation in lower-mass halos, orphan galaxies, and modifications to dark matter physics, such investigations ultimately depend on the accuracy of the tools used to analyze the subhalo population in simulations.In this dissertation, I introduce Bloodhound, a next-generation algorithm designed to improve the accuracy and consistency of subhalo tracking in numerical simulations of galaxies. Unlike conventional pipelines that rely on separate merger tree builders to link halos identified by halo finders, Bloodhound traces subhalos over time by following particles directly, allowing it to maintain subhalo identity even in dense environments where standard methods tend to struggle. Using the Phat ELVIS suite of high-resolution Milky Way-mass halos, I demonstrate that Bloodhound recovers a more complete subhalo population and mitigates systematic artifacts that hinder accurate substructure analyses.Finally, I explore the scientific implications of these improvements for two key applications: predictions for the Milky Way's ultra-faint satellite galaxy population and the detectability of dark subhalos through gravitational perturbations they induce in Globular Cluster stellar streams. These results are especially timely given the observational breakthroughs expected from current and upcoming surveys with Euclid, JWST, Roman, and Rubin, which promise to probe the structure of the Universe on the smallest galactic scales.
- 언어주기
- English
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 일반주제명
- Atmospheric sciences
- 키워드
- Dark matter
- 키워드
- Milky Way
- 키워드
- Subhalos
- 키워드
- Galaxy formation
- 기타저자
- The University of Texas at Austin Physics
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260311091528.5
■006m o d
■007cr|nu||||||||
■020 ▼a9798270231279
■040 ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082 ▼a523
■1001 ▼aKong, Hyunsu▼eauthor.
■24510▼aDark Matter Substructure in the Milky Way ▼cHyunsu Kong
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2025
■264 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a1 electronic resource (109 pages)
■336 ▼atext▼btxt▼2rdacontent
■337 ▼acomputer▼bc▼2rdamedia
■338 ▼aonline resource▼bcr▼2rdacarrier
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisors: Kilic, Can; Boylan-Kolchin, Michael Committee members: Boddy, Kimberly; Bullock, James; Zimmerman, Aaron.
■5021 ▼bPh.D.▼cThe University of Texas at Austin▼d2025.
■520 ▼aThe standard ΛCDM cosmological model predicts a wealth of small-scale structures, including dark matter subhalos residing within more massive halos such as that of our own Milky Way galaxy. While some of these subhalos may be massive enough to host faint galaxies, smaller ones fall below the threshold of galaxy formation and remain dark. Together, the abundance and survivability of both luminous and dark subhalos offer a powerful test of the ΛCDM paradigm on small scales.Recent observational advances have uncovered a growing population of faint satellite galaxies around the Milky Way, reigniting a longstanding tension. State-of-the-art simulations, when analyzed with conventional halo tracking tools, now predict a subhalo population that is again inconsistent with the observed MW satellite distribution - this time, predicting too few, especially in the inner regions of the host halo. Although several theoretical solutions have been proposed, including star formation in lower-mass halos, orphan galaxies, and modifications to dark matter physics, such investigations ultimately depend on the accuracy of the tools used to analyze the subhalo population in simulations.In this dissertation, I introduce Bloodhound, a next-generation algorithm designed to improve the accuracy and consistency of subhalo tracking in numerical simulations of galaxies. Unlike conventional pipelines that rely on separate merger tree builders to link halos identified by halo finders, Bloodhound traces subhalos over time by following particles directly, allowing it to maintain subhalo identity even in dense environments where standard methods tend to struggle. Using the Phat ELVIS suite of high-resolution Milky Way-mass halos, I demonstrate that Bloodhound recovers a more complete subhalo population and mitigates systematic artifacts that hinder accurate substructure analyses.Finally, I explore the scientific implications of these improvements for two key applications: predictions for the Milky Way's ultra-faint satellite galaxy population and the detectability of dark subhalos through gravitational perturbations they induce in Globular Cluster stellar streams. These results are especially timely given the observational breakthroughs expected from current and upcoming surveys with Euclid, JWST, Roman, and Rubin, which promise to probe the structure of the Universe on the smallest galactic scales.
■546 ▼aEnglish
■590 ▼aSchool code: 0227
■650 4▼aAstrophysics
■650 4▼aAstronomy
■650 4▼aAtmospheric sciences
■653 ▼aDark matter
■653 ▼aMilky Way
■653 ▼aSubhalos
■653 ▼aSubhalo population
■653 ▼aGalaxy formation
■7102 ▼aThe University of Texas at Austin▼bPhysics.▼edegree granting institution.
■7201 ▼aKilic, Can▼edegree supervisor.
■7201 ▼aBoylan-Kolchin, Michael▼edegree supervisor.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361181▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
