본문

서브메뉴

Constraining Reionization With the High-z Lyman-α Forest
Constraining Reionization With the High-z Lyman-α Forest
Constraining Reionization With the High-z Lyman-α Forest

Detailed Information

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  
Intergalactic medium
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.

Preview

Export

ChatGPT Discussion

AI Recommended Related Books


    New Books MORE
    Statistics for the past 3 years. Go to brief

    Подробнее информация.

    • Бронирование
    • не существует
    • моя папка
    • Первый запрос зрения
    • Non-Book Loan Application
    • Nighttime Book Loan Application
    материал
    Reg No. Количество платежных Местоположение статус Ленд информации
    TF11435 전자도서 대출가능 My Folder 부재도서신고 비도서대출신청 야간 도서대출신청

    * Бронирование доступны в заимствований книги. Чтобы сделать предварительный заказ, пожалуйста, нажмите кнопку бронирование

    Books borrowed together with this book

    Related Popular Books

    Available after logging in.