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Advancements Towards Precision Cosmology With Galaxy Clusters in the Era of Large Photometric Surveys
Advancements Towards Precision Cosmology With Galaxy Clusters in the Era of Large Photomet...
Advancements Towards Precision Cosmology With Galaxy Clusters in the Era of Large Photometric Surveys

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211153010
ISBN  
9798384044703
DDC  
523
저자명  
Esteves, Johnny H.
서명/저자  
Advancements Towards Precision Cosmology With Galaxy Clusters in the Era of Large Photometric Surveys
발행사항  
[Sl] : University of Michigan, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
161 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
주기사항  
Advisor: Huterer, Dragan;Soares-Santos, Marcelle.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2024.
초록/해제  
요약Galaxy clusters, which are predominantly composed of dark matter with only about 18% of their mass in baryonic form and a mere 2% in stars, serve as cosmological probes through their abundance across various mass and redshift ranges. The total mass of these systems is inferred via weak lensing, which distorts the light from background sources. This is done by calibrating scaling relations with observables such as galaxy richness, stellar mass, Sunyaev-Zeldovich signal, gas mass, and X-ray counts. The detection capabilities of large photometric surveys, like the Dark Energy Survey (DES) and the upcoming Legacy Survey of Space and Time (LSST), offer an unparalleled opportunity to study a wide array of systems, especially those of lower mass. However, accurately calibrating scaling relations with observables in the optical domain remains a significant challenge for leveraging these surveys for accurate cosmological constraints.In response, we present a novel mass-proxy, µ⋆, based on the probability-weighted stellar mass sum of cluster galaxies. Our methodology involves computing membership probabilities for all galaxies within clusters, not just the red-sequence ones. To achieve this, we developed and validated the Copacabana algorithm using simulations mimicking the photometric redshifts of both DES and LSST. Our findings indicate that the Copacabana µ⋆-mass relation has an average scatter of 0.20 dex, making it a competitive mass proxy for these surveys.Furthermore, we demonstrate that µ⋆ is robust against large-scale structure correlations. We study the optical selection bias, a major source of systematic uncertainties in current analyses, modeling it as a projection effect. Prior attempts to account for this bias employed ad-hoc corrections without considering physically motivated models. Our approach introduces a slight modification to the halo model, incorporating an additional halo density profile. We show that an effective Navarro-Frenk-White profile, accounting for contributions from secondary halos along the line-of-sight of the primary halo, provides a more accurate description than previous models.A novel forward method was proposed by the DES cluster working group for the upcoming DES cosmological results. This model encapsulates cluster cosmology observables, like number counts, in a single equation, incorporating all systematics. Despite the model's complexity, which requires computing integrals with multiple dimensions, we leveraged GPU acceleration along with optimized algorithms and some approximations to achieve evaluations in seconds-over 100 times faster than traditional CPU methods.We also studied the systematic effects of the LSST camera CCD sensors on PSF, photometry, and astrometry measurements. We offer detailed characterizations and corrections for gain variations and pixel area distortions. We show that sensor effects are within the stringent requirements of the project for the survey's ten-year lifespan.This work contributes towards future precision cosmology studies by improving elements of the analysis, overcoming some of the computational challenges, and mitigating instrumental sources of systematic uncertainties.
일반주제명  
Astrophysics
일반주제명  
Physics
일반주제명  
Atmospheric sciences
키워드  
Galaxy cluster
키워드  
Cosmology
키워드  
Photometric surveys
키워드  
Dark Energy Survey
키워드  
Copacabana algorithm
기타저자  
University of Michigan Physics
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■0820  ▼a523
■1001  ▼aEsteves,  Johnny  H.
■24510▼aAdvancements  Towards  Precision  Cosmology  With  Galaxy  Clusters  in  the  Era  of  Large  Photometric  Surveys
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a161  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  B.
■500    ▼aAdvisor:  Huterer,  Dragan;Soares-Santos,  Marcelle.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2024.
■520    ▼aGalaxy  clusters,  which  are  predominantly  composed  of  dark  matter  with  only  about  18%  of  their  mass  in  baryonic  form  and  a  mere  2%  in  stars,  serve  as  cosmological  probes  through  their  abundance  across  various  mass  and  redshift  ranges.  The  total  mass  of  these  systems  is  inferred  via  weak  lensing,  which  distorts  the  light  from  background  sources.  This  is  done  by  calibrating  scaling  relations  with  observables  such  as  galaxy  richness,  stellar  mass,  Sunyaev-Zeldovich  signal,  gas  mass,  and  X-ray  counts.  The  detection  capabilities  of  large  photometric  surveys,  like  the  Dark  Energy  Survey  (DES)  and  the  upcoming  Legacy  Survey  of  Space  and  Time  (LSST),  offer  an  unparalleled  opportunity  to  study  a  wide  array  of  systems,  especially  those  of  lower  mass.  However,  accurately  calibrating  scaling  relations  with  observables  in  the  optical  domain  remains  a  significant  challenge  for  leveraging  these  surveys  for  accurate  cosmological  constraints.In  response,  we  present  a  novel  mass-proxy,  µ⋆,  based  on  the  probability-weighted  stellar  mass  sum  of  cluster  galaxies.  Our  methodology  involves  computing  membership  probabilities  for  all  galaxies  within  clusters,  not  just  the  red-sequence  ones.  To  achieve  this,  we  developed  and  validated  the  Copacabana  algorithm  using  simulations  mimicking  the  photometric  redshifts  of  both  DES  and  LSST.  Our  findings  indicate  that  the  Copacabana  µ⋆-mass  relation  has  an  average  scatter  of  0.20  dex,  making  it  a  competitive  mass  proxy  for  these  surveys.Furthermore,  we  demonstrate  that  µ⋆  is  robust  against  large-scale  structure  correlations.  We  study  the  optical  selection  bias,  a  major  source  of  systematic  uncertainties  in  current  analyses,  modeling  it  as  a  projection  effect.  Prior  attempts  to  account  for  this  bias  employed  ad-hoc  corrections  without  considering  physically  motivated  models.  Our  approach  introduces  a  slight  modification  to  the  halo  model,  incorporating  an  additional  halo  density  profile.  We  show  that  an  effective  Navarro-Frenk-White  profile,  accounting  for  contributions  from  secondary  halos  along  the  line-of-sight  of  the  primary  halo,  provides  a  more  accurate  description  than  previous  models.A  novel  forward  method  was  proposed  by  the  DES  cluster  working  group  for  the  upcoming  DES  cosmological  results.  This  model  encapsulates  cluster  cosmology  observables,  like  number  counts,  in  a  single  equation,  incorporating  all  systematics.  Despite  the  model's  complexity,  which  requires  computing  integrals  with  multiple  dimensions,  we  leveraged  GPU  acceleration  along  with  optimized  algorithms  and  some  approximations  to  achieve  evaluations  in  seconds-over  100  times  faster  than  traditional  CPU  methods.We  also  studied  the  systematic  effects  of  the  LSST  camera  CCD  sensors  on  PSF,  photometry,  and  astrometry  measurements.  We  offer  detailed  characterizations  and  corrections  for  gain  variations  and  pixel  area  distortions.  We  show  that  sensor  effects  are  within  the  stringent  requirements  of  the  project  for  the  survey's  ten-year  lifespan.This  work  contributes  towards  future  precision  cosmology  studies  by  improving  elements  of  the  analysis,  overcoming  some  of  the  computational  challenges,  and  mitigating  instrumental  sources  of  systematic  uncertainties.
■590    ▼aSchool  code:  0127.
■650  4▼aAstrophysics
■650  4▼aPhysics
■650  4▼aAtmospheric  sciences
■653    ▼aGalaxy  cluster
■653    ▼aCosmology
■653    ▼aPhotometric  surveys
■653    ▼aDark  Energy  Survey
■653    ▼aCopacabana  algorithm
■690    ▼a0605
■690    ▼a0596
■690    ▼a0725
■71020▼aUniversity  of  Michigan▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-03B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164500▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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