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Constraining Reionization With the High-z Lyman-α Forest
Constraining Reionization With the High-z Lyman-α Forest
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152022
- ISBN
- 9798384038801
- DDC
- 523
- 저자명
- Wolfson, Molly.
- 서명/저자
- Constraining Reionization With the High-z Lyman-α Forest
- 발행사항
- [Sl] : University of California, Santa Barbara, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 228 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Hennawi, Joseph.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Santa Barbara, 2024.
- 초록/해제
- 요약Understanding the reionization of the intergalactic medium (IGM) by the first luminous sources remains an important open problem in cosmology. During Reionization ionization fronts propagate through the IGM, heating the reionized gas. This heat injection can be observed over a redshift interval of ∆z ∼ 1 due to the long cooling times in the low-density IGM. Simultaneously, the mean free path of ionizing photons (λmfp) describing the ultraviolet background (UVB) rapidly evolves as bubbles of reionized gas, where the UVB is stronger, merge. Thus, constraining the thermal state of the IGM and the evolution of λmfp can, in turn, be used to constrain reionization. Transmission in the Lyman-α (Lyα) forest, the ubiquitous Lyα absorption lines produced by residual neutral hydrogen in the IGM along quasar sightlines, offers a powerful tool to investigate these phenomena.Here I present studies that look into utilizing the z 5 Lyα forest to constrain Reionization via the thermal state of the IGM and λmfp. First, I use wavelet analysis as an initial clustering statistic and shows improvement on simulated temperature constraints when compared to measurements from the 1D Lyα forest power spectrum. This work also notes the importance of careful accounting of the correlations between datasets to ensure observational constraints are not over-confident. The next two studies use the Lyα forest auto-correlation function at z ≥ 5.4 as the clustering statistic. The second study demonstrates the potential in constraining λmfp from simulated data while the third does the same for the temperature. Both of these do careful statistical inference tests to ensure the results are not over-confident and describe a method to guarantee statistical robustness of measurements. The final study makes measurements of the Lyα forest auto-correlation functions at z 5 from the XQR-30 data set. Preliminary comparisons of these measurements to the models from the second study are done, showing agreement with previous measurements of λmfp. Each of these contribute to our understanding of the high-z Lyα forest and how it can be used to constrain Reionization.
- 일반주제명
- Astrophysics
- 일반주제명
- Applied physics
- 일반주제명
- Physics
- 키워드
- Cosmology
- 키워드
- Quasars
- 키워드
- Reionization
- 기타저자
- University of California, Santa Barbara Physics
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017162520
■00520250211152022
■006m o d
■007cr#unu||||||||
■020 ▼a9798384038801
■035 ▼a(MiAaPQ)AAI31332369
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aWolfson, Molly.
■24510▼aConstraining Reionization With the High-z Lyman-α Forest
■260 ▼a[Sl]▼bUniversity of California, Santa Barbara▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a228 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Hennawi, Joseph.
■5021 ▼aThesis (Ph.D.)--University of California, Santa Barbara, 2024.
■520 ▼aUnderstanding the reionization of the intergalactic medium (IGM) by the first luminous sources remains an important open problem in cosmology. During Reionization ionization fronts propagate through the IGM, heating the reionized gas. This heat injection can be observed over a redshift interval of ∆z ∼ 1 due to the long cooling times in the low-density IGM. Simultaneously, the mean free path of ionizing photons (λmfp) describing the ultraviolet background (UVB) rapidly evolves as bubbles of reionized gas, where the UVB is stronger, merge. Thus, constraining the thermal state of the IGM and the evolution of λmfp can, in turn, be used to constrain reionization. Transmission in the Lyman-α (Lyα) forest, the ubiquitous Lyα absorption lines produced by residual neutral hydrogen in the IGM along quasar sightlines, offers a powerful tool to investigate these phenomena.Here I present studies that look into utilizing the z 5 Lyα forest to constrain Reionization via the thermal state of the IGM and λmfp. First, I use wavelet analysis as an initial clustering statistic and shows improvement on simulated temperature constraints when compared to measurements from the 1D Lyα forest power spectrum. This work also notes the importance of careful accounting of the correlations between datasets to ensure observational constraints are not over-confident. The next two studies use the Lyα forest auto-correlation function at z ≥ 5.4 as the clustering statistic. The second study demonstrates the potential in constraining λmfp from simulated data while the third does the same for the temperature. Both of these do careful statistical inference tests to ensure the results are not over-confident and describe a method to guarantee statistical robustness of measurements. The final study makes measurements of the Lyα forest auto-correlation functions at z 5 from the XQR-30 data set. Preliminary comparisons of these measurements to the models from the second study are done, showing agreement with previous measurements of λmfp. Each of these contribute to our understanding of the high-z Lyα forest and how it can be used to constrain Reionization.
■590 ▼aSchool code: 0035.
■650 4▼aAstrophysics
■650 4▼aApplied physics
■650 4▼aPhysics
■653 ▼aCosmology
■653 ▼aIntergalactic medium
■653 ▼aQuasars
■653 ▼aReionization
■690 ▼a0596
■690 ▼a0215
■690 ▼a0605
■71020▼aUniversity of California, Santa Barbara▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0035
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162520▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


