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Cluster-Lensed Quasars: From Discovery to a Measurement of the Hubble Constant
Cluster-Lensed Quasars: From Discovery to a Measurement of the Hubble Constant
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152951
- ISBN
- 9798384041818
- DDC
- 523
- 저자명
- Napier, Kate.
- 서명/저자
- Cluster-Lensed Quasars: From Discovery to a Measurement of the Hubble Constant
- 발행사항
- [Sl] : University of Michigan, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 119 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Sharon, Keren.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2024.
- 초록/해제
- 요약Quasars strongly lensed by galaxy clusters are inherently rare, yet they offer rich insights into astrophysics and cosmology. Cluster-lensed quasars can be used to measure the current expansion rate of the Universe, the Hubble constant H0. A measurement of H0 from cluster-lensed quasars is particularly important given the claimed Hubble tension: a 5σ tension between Cosmic Microwave Background-based and distance ladder-based measurements of H0.Time-delay cosmography, the technique of using a lensed variable source such as a quasar to measure the Hubble constant, relies on the inverse scaling of H0 with the delay between the arrival times of at least two images of the strongly-lensed variable source. In addition to an observational measurement of the time delay between the images, time-delay cosmography also requires an accurate mapping of the projected mass density of the lens. Although the theory was originally proposed by Refsdal in 1964, an actual measurement of H0 from cluster-lensed quasars only recently became possible as the first systems acquired all the necessary data.My thesis presents the first measurement of the Hubble constant from SDSS J1004+4112, SDSS J1029+2623, and SDSS J2222+2745, the only three cluster-lensed quasars that have high-resolution imaging from the Hubble Space Telescope, spectroscopic redshift measurements of the lensed sources, and time delay measurements from years-long monitoring. I measured H0 = 74.1 ± 8.0 km s-1 Mpc-1. Although the uncertainty is too high to discriminate between Cosmic Microwave Background-based and distance ladder-based measurements of H0, I demonstrate that a competitive 1% measurement of H0 from cluster-lensed quasars can be achievable if a sufficiently large number of systems is discovered and we decrease the systematic uncertainties arising from modeling the projected mass density of the lenses by a factor of 2.5.My thesis also presents the discovery of two new cluster-lensed quasars, COOL J0335-1927 and COOL J0542-2125. While the observational follow-up of these systems is not yet mature enough for a measurement of the Hubble constant, my collaborators and I are in the process of acquiring all the necessary data. We have ongoing photometric monitoring campaigns with the 2.56-meter Nordic Optical Telescope and the 6.5-meter Magellan Telescopes to measure the time delays between the quasar images. My thesis presents the most up-to-date light curves. Additionally, we recently observed COOL J0542-2125 with the Chandra X-ray Observatory and the Hubble Space Telescope. Utilizing the Hubble imaging data, I present a revised lens model that builds on the one published in Martinez et al. (2023) which I computed using only ground-based imaging. Combined with a precise time delay measurement, an H0 measurement from COOL J0542-2125 will be possible by 2027.The work of this thesis helps lay the groundwork for the exciting era of time-delay cosmography we are about to enter. Euclid, the Vera C. Rubin Observatory, and the Nancy Grace Roman Space Telescope will discover tens of new cluster-lensed quasars, making a 1% measurement of the Hubble constant from cluster-lensed quasars within reach. A 1% measurement of H0 from cluster-lensed quasars can help solve whether the Hubble tension is real, implying that our model of the Universe is incomplete, or a result of unaccounted for systematics.
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 일반주제명
- Applied physics
- 일반주제명
- Planetology
- 키워드
- Galaxy clusters
- 키워드
- Cosmology
- 키워드
- Hubble constant
- 키워드
- Quasars
- 기타저자
- University of Michigan Astronomy and Astrophysics
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152951
■006m o d
■007cr#unu||||||||
■020 ▼a9798384041818
■035 ▼a(MiAaPQ)AAI31631040
■035 ▼a(MiAaPQ)umichrackham005720
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aNapier, Kate.
■24510▼aCluster-Lensed Quasars: From Discovery to a Measurement of the Hubble Constant
■260 ▼a[Sl]▼bUniversity of Michigan▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a119 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Sharon, Keren.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2024.
■520 ▼aQuasars strongly lensed by galaxy clusters are inherently rare, yet they offer rich insights into astrophysics and cosmology. Cluster-lensed quasars can be used to measure the current expansion rate of the Universe, the Hubble constant H0. A measurement of H0 from cluster-lensed quasars is particularly important given the claimed Hubble tension: a 5σ tension between Cosmic Microwave Background-based and distance ladder-based measurements of H0.Time-delay cosmography, the technique of using a lensed variable source such as a quasar to measure the Hubble constant, relies on the inverse scaling of H0 with the delay between the arrival times of at least two images of the strongly-lensed variable source. In addition to an observational measurement of the time delay between the images, time-delay cosmography also requires an accurate mapping of the projected mass density of the lens. Although the theory was originally proposed by Refsdal in 1964, an actual measurement of H0 from cluster-lensed quasars only recently became possible as the first systems acquired all the necessary data.My thesis presents the first measurement of the Hubble constant from SDSS J1004+4112, SDSS J1029+2623, and SDSS J2222+2745, the only three cluster-lensed quasars that have high-resolution imaging from the Hubble Space Telescope, spectroscopic redshift measurements of the lensed sources, and time delay measurements from years-long monitoring. I measured H0 = 74.1 ± 8.0 km s-1 Mpc-1. Although the uncertainty is too high to discriminate between Cosmic Microwave Background-based and distance ladder-based measurements of H0, I demonstrate that a competitive 1% measurement of H0 from cluster-lensed quasars can be achievable if a sufficiently large number of systems is discovered and we decrease the systematic uncertainties arising from modeling the projected mass density of the lenses by a factor of 2.5.My thesis also presents the discovery of two new cluster-lensed quasars, COOL J0335-1927 and COOL J0542-2125. While the observational follow-up of these systems is not yet mature enough for a measurement of the Hubble constant, my collaborators and I are in the process of acquiring all the necessary data. We have ongoing photometric monitoring campaigns with the 2.56-meter Nordic Optical Telescope and the 6.5-meter Magellan Telescopes to measure the time delays between the quasar images. My thesis presents the most up-to-date light curves. Additionally, we recently observed COOL J0542-2125 with the Chandra X-ray Observatory and the Hubble Space Telescope. Utilizing the Hubble imaging data, I present a revised lens model that builds on the one published in Martinez et al. (2023) which I computed using only ground-based imaging. Combined with a precise time delay measurement, an H0 measurement from COOL J0542-2125 will be possible by 2027.The work of this thesis helps lay the groundwork for the exciting era of time-delay cosmography we are about to enter. Euclid, the Vera C. Rubin Observatory, and the Nancy Grace Roman Space Telescope will discover tens of new cluster-lensed quasars, making a 1% measurement of the Hubble constant from cluster-lensed quasars within reach. A 1% measurement of H0 from cluster-lensed quasars can help solve whether the Hubble tension is real, implying that our model of the Universe is incomplete, or a result of unaccounted for systematics.
■590 ▼aSchool code: 0127.
■650 4▼aAstrophysics
■650 4▼aAstronomy
■650 4▼aApplied physics
■650 4▼aPlanetology
■653 ▼aStrong gravitational lensing
■653 ▼aGalaxy clusters
■653 ▼aCosmology
■653 ▼aHubble constant
■653 ▼aQuasars
■653 ▼aHubble Space Telescope
■690 ▼a0606
■690 ▼a0596
■690 ▼a0215
■690 ▼a0590
■71020▼aUniversity of Michigan▼bAstronomy and Astrophysics.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164348▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


