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21-cm Cosmology and Low-Frequency Radio Astronomy From the Moon
21-cm Cosmology and Low-Frequency Radio Astronomy From the Moon
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103105
- ISBN
- 9798315700128
- DDC
- 523
- 저자명
- Hibbard, J. J.
- 서명/저자
- 21-cm Cosmology and Low-Frequency Radio Astronomy From the Moon
- 발행사항
- [Sl] : University of Colorado at Boulder, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 345 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Burns, Jack O.;Rapetti, David.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2025.
- 초록/해제
- 요약21-cm cosmology concerns itself with the last, unmeasured epochs of the Universe, between the decoupling of the CMB and the end of Reionization in particular. These epochs include the cosmic Dark Ages, before any luminous astrophysical structures had formed, Cosmic Dawn, when the first sources and galaxies appeared, and the Epoch of Reionization, when they reionized the intergalactic medium. By measuring the hyperfine, highly redshifted 21-cm line of neutral Hydrogen during these epochs, it is possible to map the thermal and ionization state of the entire Universe, describe the first sources, map structure formation, and even test dark matter and cosmology models in unique ways and epochs, such as during the Dark Ages. Formidable systematics, however, must be removed before an unambiguous detection is made. In this thesis we present novel models, statistical tests, and analyses for two of the primary systematics, including the galactic foreground and the radio antenna beam, as well as methods for robustly constraining and removing them from radio spectrometer data aimed at detecting the 21-cm signal. We also present an analysis describing how warm dark matter and population III stars affect the shape of the sky-averaged 21-cm signal and an analysis of their detectability in the presence of degeneracies with other astrophysical model parameters and systematic noise. Lastly, we present new results from the first radio telescope of NASA's to land on the Moon, ROLSES-1, including potential techno-signatures detected from the Earth and constraints upon the isotropic galactic background spectrum, both the first measurements of their kind from the surface of the Moon. We present the methods for calibrating, cleaning, and reducing the raw data, as well as the statistical methods used to extract antenna parameter values and the amplitude of the galactic spectrum. Lastly, we outline some methods for use in modeling and 21-cm signal extraction in the future, and how our methods may be applied to upcoming lunar radio telescopes.
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 일반주제명
- Physics
- 키워드
- Cosmic dawn
- 키워드
- Cosmology
- 키워드
- Dark Ages
- 키워드
- Radio astronomy
- 기타저자
- University of Colorado at Boulder Astrophysical and Planetary Sciences
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103105
■006m o d
■007cr#unu||||||||
■020 ▼a9798315700128
■035 ▼a(MiAaPQ)AAI31935308
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aHibbard, J. J.▼0(orcid)0000-0002-9377-5133
■24510▼a21-cm Cosmology and Low-Frequency Radio Astronomy From the Moon
■260 ▼a[Sl]▼bUniversity of Colorado at Boulder▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a345 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Burns, Jack O.;Rapetti, David.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2025.
■520 ▼a21-cm cosmology concerns itself with the last, unmeasured epochs of the Universe, between the decoupling of the CMB and the end of Reionization in particular. These epochs include the cosmic Dark Ages, before any luminous astrophysical structures had formed, Cosmic Dawn, when the first sources and galaxies appeared, and the Epoch of Reionization, when they reionized the intergalactic medium. By measuring the hyperfine, highly redshifted 21-cm line of neutral Hydrogen during these epochs, it is possible to map the thermal and ionization state of the entire Universe, describe the first sources, map structure formation, and even test dark matter and cosmology models in unique ways and epochs, such as during the Dark Ages. Formidable systematics, however, must be removed before an unambiguous detection is made. In this thesis we present novel models, statistical tests, and analyses for two of the primary systematics, including the galactic foreground and the radio antenna beam, as well as methods for robustly constraining and removing them from radio spectrometer data aimed at detecting the 21-cm signal. We also present an analysis describing how warm dark matter and population III stars affect the shape of the sky-averaged 21-cm signal and an analysis of their detectability in the presence of degeneracies with other astrophysical model parameters and systematic noise. Lastly, we present new results from the first radio telescope of NASA's to land on the Moon, ROLSES-1, including potential techno-signatures detected from the Earth and constraints upon the isotropic galactic background spectrum, both the first measurements of their kind from the surface of the Moon. We present the methods for calibrating, cleaning, and reducing the raw data, as well as the statistical methods used to extract antenna parameter values and the amplitude of the galactic spectrum. Lastly, we outline some methods for use in modeling and 21-cm signal extraction in the future, and how our methods may be applied to upcoming lunar radio telescopes.
■590 ▼aSchool code: 0051.
■650 4▼aAstrophysics
■650 4▼aAstronomy
■650 4▼aPhysics
■653 ▼aCosmic dawn
■653 ▼aCosmology
■653 ▼aDark Ages
■653 ▼aEpoch of Reionization
■653 ▼aRadio astronomy
■690 ▼a0596
■690 ▼a0606
■690 ▼a0605
■71020▼aUniversity of Colorado at Boulder▼bAstrophysical and Planetary Sciences.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0051
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356941▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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