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Directed Semi-Coherent Searches for Continuous Gravitational Waves From Supernova Remnants
Directed Semi-Coherent Searches for Continuous Gravitational Waves From Supernova Remnants
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153019
- ISBN
- 9798384046196
- DDC
- 530
- 저자명
- Wang, Jonathan.
- 서명/저자
- Directed Semi-Coherent Searches for Continuous Gravitational Waves From Supernova Remnants
- 발행사항
- [Sl] : University of Michigan, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 133 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
- 주기사항
- Advisor: Riles, Keith.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2024.
- 초록/해제
- 요약2015 saw the first ever detection of gravitational waves when the LIGO detectors observed the merger of two black holes. This event heralded a new age of modern astronomy, with many more compact binary coalescences of black holes and neutron stars having been observed since. Compact binary mergers are just one type of astrophysical event LIGO hopes to observe, and steady improvements to the advanced detectors bring us ever closer to detecting new classes of gravitational radiation. Continuous waves are one such undetected class of gravitational waves, which are canonically emitted by young, quickly rotating neutron stars possessing axial-asymmetries. In this dissertation, we present the methods and results of directed, semi-coherent searches from the supernova remnants Cassiopeia A and Vela Jr for continuous waves. The searches were conducted using the O3a and O3 Advanced LIGO observing runs, and include two broad sweeps across the frequency band 20-976 Hz with coherence times of 5 and 7.5 days for Cassiopeia A and Vela Jr, respectively, as well as one narrow, in-depth search from 20-201 Hz of Cassiopeia A using a 30 day coherence time. We obtain strain upper limit sensitivities as low as ∼ 6.3x10−26 for Cassiopeia A and ∼ 5.6 x 10−26 for Vela Jr near 166 Hz for the broad searches, and a full set of rigorous strain upper limits as low as ∼ 4.01 x 10−26 near 200 Hz for the deep Cassiopeia A search. All sensitivities and upper limits are computed at 95% confidence levels. All three searches ultimately failed to make a continuous wave detection, but, at their times of completion, set the strictest upper limits for their sources over their respective parameter spaces.
- 일반주제명
- Physics
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 키워드
- Continuous waves
- 기타저자
- University of Michigan Physics
- 기본자료저록
- Dissertations Abstracts International. 86-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211153019
■006m o d
■007cr#unu||||||||
■020 ▼a9798384046196
■035 ▼a(MiAaPQ)AAI31631567
■035 ▼a(MiAaPQ)umichrackham005711
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aWang, Jonathan.
■24510▼aDirected Semi-Coherent Searches for Continuous Gravitational Waves From Supernova Remnants
■260 ▼a[Sl]▼bUniversity of Michigan▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a133 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-04, Section: B.
■500 ▼aAdvisor: Riles, Keith.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2024.
■520 ▼a2015 saw the first ever detection of gravitational waves when the LIGO detectors observed the merger of two black holes. This event heralded a new age of modern astronomy, with many more compact binary coalescences of black holes and neutron stars having been observed since. Compact binary mergers are just one type of astrophysical event LIGO hopes to observe, and steady improvements to the advanced detectors bring us ever closer to detecting new classes of gravitational radiation. Continuous waves are one such undetected class of gravitational waves, which are canonically emitted by young, quickly rotating neutron stars possessing axial-asymmetries. In this dissertation, we present the methods and results of directed, semi-coherent searches from the supernova remnants Cassiopeia A and Vela Jr for continuous waves. The searches were conducted using the O3a and O3 Advanced LIGO observing runs, and include two broad sweeps across the frequency band 20-976 Hz with coherence times of 5 and 7.5 days for Cassiopeia A and Vela Jr, respectively, as well as one narrow, in-depth search from 20-201 Hz of Cassiopeia A using a 30 day coherence time. We obtain strain upper limit sensitivities as low as ∼ 6.3x10−26 for Cassiopeia A and ∼ 5.6 x 10−26 for Vela Jr near 166 Hz for the broad searches, and a full set of rigorous strain upper limits as low as ∼ 4.01 x 10−26 near 200 Hz for the deep Cassiopeia A search. All sensitivities and upper limits are computed at 95% confidence levels. All three searches ultimately failed to make a continuous wave detection, but, at their times of completion, set the strictest upper limits for their sources over their respective parameter spaces.
■590 ▼aSchool code: 0127.
■650 4▼aPhysics
■650 4▼aAstrophysics
■650 4▼aAstronomy
■653 ▼aGravitational waves
■653 ▼aContinuous waves
■653 ▼aSupernova remnants
■690 ▼a0605
■690 ▼a0596
■690 ▼a0606
■71020▼aUniversity of Michigan▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-04B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164580▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
