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Optical Variability of Intermediate-Mass Black Holes as a Probe of Black Hole Accretion and Growth
Optical Variability of Intermediate-Mass Black Holes as a Probe of Black Hole Accretion and Growth
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105418
- ISBN
- 9798291564172
- DDC
- 520
- 저자명
- Burke, Colin J.
- 서명/저자
- Optical Variability of Intermediate-Mass Black Holes as a Probe of Black Hole Accretion and Growth
- 발행사항
- [Sl] : University of Illinois at Urbana-Champaign, 2023
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- 형태사항
- 178 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Shen, Yue.
- 학위논문주기
- Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2023.
- 초록/해제
- 요약Active galactic nuclei (AGNs) in dwarf galaxies (dwarf AGNs) are believed to host accreting intermediate-mass black holes (IMBHs). The demographics of dwarf AGNs are an important tracer of supermassive black hole (SMBH) growth, because their relic IMBHs act as a fossil record of SMBH seeding pathways at high redshift. Being ubiquitous across wavelengths and timescales, AGN variability is useful for AGN identification and is an important probe of BH accretion. Because the physical timescales associated with BH accretion generally scale with the mass of the BH, dwarf AGNs with accreting IMBHs are new laboratories for studying BH accretion on human timescales. The first part of this dissertation is focused on observational evidence for a characteristic thermal timescale in accretion disks using optical light curves from stellar-mass accreting systems to SMBHs in AGNs. This is motivated by the ~ days timescale variability in the optical light curve of the dwarf AGN NGC 4395. These results are presented in Chapter 2. Chapter 3 focuses on identification of dwarf AGN from variability beyond z ~ 0.1 (the limit of what has been probed by previous work) using light curves from the Dark Energy Survey Supernova survey program. Chapter 4 presents a phenomenological forward model for forecasting dwarf AGNs and constraining the corresponding IMBH number density or occupation fraction with optical variability. Chapter 5 presents detailed spectroscopic tests of the AGN nature in a small sample of extremely metal-poor dwarf galaxies. Future test of BH-host galaxy co-evolution in the IMBH regime could help illuminate models of SMBH seeding and feedback in dwarf galaxies. Constraining the IMBH number density using these probes will be critical for forecasting the gravitational wave events with the upcoming Laser Interferometer Space Antenna (LISA) mission.
- 일반주제명
- Astronomy
- 일반주제명
- Astrophysics
- 일반주제명
- Optics
- 키워드
- Variability
- 키워드
- Dwarf galaxies
- 기타저자
- University of Illinois at Urbana-Champaign Astronomy
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■035 ▼a(MiAaPQ)httphdlhandlenet2142121408
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a520
■1001 ▼aBurke, Colin J.
■24510▼aOptical Variability of Intermediate-Mass Black Holes as a Probe of Black Hole Accretion and Growth
■260 ▼a[Sl]▼bUniversity of Illinois at Urbana-Champaign▼c2023
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2023
■300 ▼a178 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Shen, Yue.
■5021 ▼aThesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2023.
■520 ▼aActive galactic nuclei (AGNs) in dwarf galaxies (dwarf AGNs) are believed to host accreting intermediate-mass black holes (IMBHs). The demographics of dwarf AGNs are an important tracer of supermassive black hole (SMBH) growth, because their relic IMBHs act as a fossil record of SMBH seeding pathways at high redshift. Being ubiquitous across wavelengths and timescales, AGN variability is useful for AGN identification and is an important probe of BH accretion. Because the physical timescales associated with BH accretion generally scale with the mass of the BH, dwarf AGNs with accreting IMBHs are new laboratories for studying BH accretion on human timescales. The first part of this dissertation is focused on observational evidence for a characteristic thermal timescale in accretion disks using optical light curves from stellar-mass accreting systems to SMBHs in AGNs. This is motivated by the ~ days timescale variability in the optical light curve of the dwarf AGN NGC 4395. These results are presented in Chapter 2. Chapter 3 focuses on identification of dwarf AGN from variability beyond z ~ 0.1 (the limit of what has been probed by previous work) using light curves from the Dark Energy Survey Supernova survey program. Chapter 4 presents a phenomenological forward model for forecasting dwarf AGNs and constraining the corresponding IMBH number density or occupation fraction with optical variability. Chapter 5 presents detailed spectroscopic tests of the AGN nature in a small sample of extremely metal-poor dwarf galaxies. Future test of BH-host galaxy co-evolution in the IMBH regime could help illuminate models of SMBH seeding and feedback in dwarf galaxies. Constraining the IMBH number density using these probes will be critical for forecasting the gravitational wave events with the upcoming Laser Interferometer Space Antenna (LISA) mission.
■590 ▼aSchool code: 0090.
■650 4▼aAstronomy
■650 4▼aAstrophysics
■650 4▼aOptics
■653 ▼aIntermediate-mass black holes
■653 ▼aActive galactic nuclei
■653 ▼aVariability
■653 ▼aDwarf galaxies
■653 ▼aSupermassive black hole
■690 ▼a0606
■690 ▼a0752
■690 ▼a0596
■71020▼aUniversity of Illinois at Urbana-Champaign▼bAstronomy.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0090
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360281▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
