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The Past, Present, and Groundbreaking Future of OH Megamasers- [electronic resource]
The Past, Present, and Groundbreaking Future of OH Megamasers- [electronic resource]
Detailed Information
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214101254
- ISBN
- 9798380167055
- DDC
- 523
- 저자명
- Roberts, Hayley.
- 서명/저자
- The Past, Present, and Groundbreaking Future of OH Megamasers - [electronic resource]
- 발행사항
- [S.l.]: : University of Colorado at Boulder., 2023
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- 형태사항
- 1 online resource(158 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
- 주기사항
- Advisor: Darling, Jeremy.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2023.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 요약OH megamasers (OHMs) are luminous masers found in (ultra-)luminous infrared galaxies ([U]LIRGs). OHMs are signposts of major gas-rich mergers associated with some of the most extreme star forming regions in our universe. In the four decades since their discovery, only 120 OHM hosts have been detected at limited redshifts despite numerous searches in an order of magnitude more galaxies. However, the dominant OH masing line, occurring at 1667 MHz, can spoof the 1420 MHz neutral hydrogen (H I) line in untargeted surveys. H I surveys on next-generation radio telescopes, such as the Square Kilometre Array (SKA) and its precursors, will detect unprecedented numbers of OHMs. This surge in detections will not only fundamentally change the landscape of the known OHM population, but will also unlock our ability to implement OHMs as tracers of major mergers and extreme star formation on cosmic scales. Here, I present predictions for the number of OHMs that will be detected by these surveys, as well as novel methods for identifying these interlopers using a k-Nearest Neighbors machine learning algorithm. Preliminary data from H I surveys on precursor SKA telescopes is used to vet and strengthen these methods, resulting in five new OHM detections of sources originally classified as H I emission. I also present two new OHM detections from SKA precursors that showcase this upcoming revolutionary science - whether it be high quality measurements of the OH masing lines or shattering the record for highest redshift OHM detection. I also reexamine the underlying conditions required to steer a major merger on the path to producing an OHM, demonstrating that our previous theories are too simplistic to describe the full population of OHMs hosts. Lastly, I present a comprehensive catalog of all known OHMs and their host galaxies, including their IR and radio properties. This catalog and the inspection of relations between OHMs and their hosts serve as a consolidated, unified resource in the era of new OHM detections.
- 일반주제명
- Astrophysics.
- 일반주제명
- Astronomy.
- 일반주제명
- Planetology.
- 키워드
- Galaxy mergers
- 키워드
- OH megamasers
- 키워드
- Cosmic scales
- 키워드
- Radio telescopes
- 키워드
- Star formation
- 기타저자
- University of Colorado at Boulder Astrophysical and Planetary Sciences
- 기본자료저록
- Dissertations Abstracts International. 85-03B.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008240612s2023 us |||||||||||||||c||eng d■001000016933504
■00520240214101254
■006m o d
■007cr#unu||||||||
■020 ▼a9798380167055
■035 ▼a(MiAaPQ)AAI30530114
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aRoberts, Hayley.▼0(orcid)0000-0003-0046-9848
■24510▼aThe Past, Present, and Groundbreaking Future of OH Megamasers▼h[electronic resource]
■260 ▼a[S.l.]:▼bUniversity of Colorado at Boulder. ▼c2023
■260 1▼aAnn Arbor :▼bProQuest Dissertations & Theses, ▼c2023
■300 ▼a1 online resource(158 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-03, Section: B.
■500 ▼aAdvisor: Darling, Jeremy.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aOH megamasers (OHMs) are luminous masers found in (ultra-)luminous infrared galaxies ([U]LIRGs). OHMs are signposts of major gas-rich mergers associated with some of the most extreme star forming regions in our universe. In the four decades since their discovery, only 120 OHM hosts have been detected at limited redshifts despite numerous searches in an order of magnitude more galaxies. However, the dominant OH masing line, occurring at 1667 MHz, can spoof the 1420 MHz neutral hydrogen (H I) line in untargeted surveys. H I surveys on next-generation radio telescopes, such as the Square Kilometre Array (SKA) and its precursors, will detect unprecedented numbers of OHMs. This surge in detections will not only fundamentally change the landscape of the known OHM population, but will also unlock our ability to implement OHMs as tracers of major mergers and extreme star formation on cosmic scales. Here, I present predictions for the number of OHMs that will be detected by these surveys, as well as novel methods for identifying these interlopers using a k-Nearest Neighbors machine learning algorithm. Preliminary data from H I surveys on precursor SKA telescopes is used to vet and strengthen these methods, resulting in five new OHM detections of sources originally classified as H I emission. I also present two new OHM detections from SKA precursors that showcase this upcoming revolutionary science - whether it be high quality measurements of the OH masing lines or shattering the record for highest redshift OHM detection. I also reexamine the underlying conditions required to steer a major merger on the path to producing an OHM, demonstrating that our previous theories are too simplistic to describe the full population of OHMs hosts. Lastly, I present a comprehensive catalog of all known OHMs and their host galaxies, including their IR and radio properties. This catalog and the inspection of relations between OHMs and their hosts serve as a consolidated, unified resource in the era of new OHM detections.
■590 ▼aSchool code: 0051.
■650 4▼aAstrophysics.
■650 4▼aAstronomy.
■650 4▼aPlanetology.
■653 ▼aGalaxy mergers
■653 ▼aOH megamasers
■653 ▼aCosmic scales
■653 ▼aRadio telescopes
■653 ▼aStar formation
■690 ▼a0596
■690 ▼a0606
■690 ▼a0590
■71020▼aUniversity of Colorado at Boulder▼bAstrophysical and Planetary Sciences.
■7730 ▼tDissertations Abstracts International▼g85-03B.
■773 ▼tDissertation Abstract International
■790 ▼a0051
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16933504▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
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