서브메뉴
검색
Producing a BOSS-CMASS Sample With DES Y3 Imaging
Producing a BOSS-CMASS Sample With DES Y3 Imaging
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153133
- ISBN
- 9798346853329
- DDC
- 520
- 저자명
- Warner, Beverly.
- 서명/저자
- Producing a BOSS-CMASS Sample With DES Y3 Imaging
- 발행사항
- [Sl] : The Ohio State University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 147 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
- 주기사항
- Advisor: Honscheid, Klaus.
- 학위논문주기
- Thesis (Ph.D.)--The Ohio State University, 2024.
- 초록/해제
- 요약Understanding the ingredients and evolution of the universe can be attained through observing Large Scale Structure (LSS). An accurate three-dimensional map of the universe is an essential tool to characterize this Large Scale Structure. This is found by combining two-dimensional coordinates with redshift measurements, which provide information about the distance to galaxies along the line of sight. Spectroscopic measurements result in higher precision redshift estimates, however they are much more expensive in observation time compared to photometric measurements. This leads to a trade-off between accuracy and quantity of galaxy information. My research addresses this imbalance by training a model on galaxies with both photometric and spectroscopic data, namely the footprint overlap of DES with the BOSS-CMASS sample, allowing it to statistically select a galaxy sample over the non-overlapping region of the Y3 DES sample comprised of similar galaxies. The resulting sample, DES-CMASS or DMASS, has the same clustering properties as the spectroscopic CMASS sample so that precision cosmological measurements obtained from CMASS can be applied to the photometric DES sample. In a previous analysis, validation tests demonstrated that this DMASS method produced a galaxy sample with properties consistent with BOSS-CMASS data using the much smaller Y1 DES sample. My project broadens the scope to photometric data covering an area four times larger. This thesis describes the underlying methods and the validation tests designed to assess how accurately the larger Y3 DMASS catalog reproduces key properties of the BOSS-CMASS sample, such as galaxy density and redshift. We demonstrate that the galaxy bias of the DMASS Y3 sample matches that of BOSS-CMASS. Our results show that we can utilize the limited overlaps between other spectroscopic and photometric samples to create similar catalogs of combined strengths to use in cosmological analyses.
- 일반주제명
- Astronomy
- 일반주제명
- Physics
- 일반주제명
- Astrophysics
- 키워드
- Galaxies
- 키워드
- Photometric data
- 기타저자
- The Ohio State University Physics
- 기본자료저록
- Dissertations Abstracts International. 86-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017165179
■00520250211153133
■006m o d
■007cr#unu||||||||
■020 ▼a9798346853329
■035 ▼a(MiAaPQ)AAI31836989
■035 ▼a(MiAaPQ)OhioLINKosu1732714445117534
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a520
■1001 ▼aWarner, Beverly.
■24510▼aProducing a BOSS-CMASS Sample With DES Y3 Imaging
■260 ▼a[Sl]▼bThe Ohio State University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a147 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-06, Section: B.
■500 ▼aAdvisor: Honscheid, Klaus.
■5021 ▼aThesis (Ph.D.)--The Ohio State University, 2024.
■520 ▼aUnderstanding the ingredients and evolution of the universe can be attained through observing Large Scale Structure (LSS). An accurate three-dimensional map of the universe is an essential tool to characterize this Large Scale Structure. This is found by combining two-dimensional coordinates with redshift measurements, which provide information about the distance to galaxies along the line of sight. Spectroscopic measurements result in higher precision redshift estimates, however they are much more expensive in observation time compared to photometric measurements. This leads to a trade-off between accuracy and quantity of galaxy information. My research addresses this imbalance by training a model on galaxies with both photometric and spectroscopic data, namely the footprint overlap of DES with the BOSS-CMASS sample, allowing it to statistically select a galaxy sample over the non-overlapping region of the Y3 DES sample comprised of similar galaxies. The resulting sample, DES-CMASS or DMASS, has the same clustering properties as the spectroscopic CMASS sample so that precision cosmological measurements obtained from CMASS can be applied to the photometric DES sample. In a previous analysis, validation tests demonstrated that this DMASS method produced a galaxy sample with properties consistent with BOSS-CMASS data using the much smaller Y1 DES sample. My project broadens the scope to photometric data covering an area four times larger. This thesis describes the underlying methods and the validation tests designed to assess how accurately the larger Y3 DMASS catalog reproduces key properties of the BOSS-CMASS sample, such as galaxy density and redshift. We demonstrate that the galaxy bias of the DMASS Y3 sample matches that of BOSS-CMASS. Our results show that we can utilize the limited overlaps between other spectroscopic and photometric samples to create similar catalogs of combined strengths to use in cosmological analyses.
■590 ▼aSchool code: 0168.
■650 4▼aAstronomy
■650 4▼aPhysics
■650 4▼aAstrophysics
■653 ▼aLarge Scale Structure
■653 ▼aSpectroscopic data
■653 ▼aGalaxies
■653 ▼aPhotometric data
■690 ▼a0606
■690 ▼a0605
■690 ▼a0596
■71020▼aThe Ohio State University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-06B.
■790 ▼a0168
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17165179▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
