본문

서브메뉴

21-cm Cosmology and Low-Frequency Radio Astronomy From the Moon
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  
Epoch of Reionization
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

 008260126s2025        us                              c    eng  d
■001000017356941
■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.

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
    TF14662 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.