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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
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  
Strong gravitational lensing
키워드  
Galaxy clusters
키워드  
Cosmology
키워드  
Hubble constant
키워드  
Quasars
키워드  
Hubble Space Telescope
기타저자  
University of Michigan Astronomy and Astrophysics
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
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MARC

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■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.

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