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The Physics of the Coronal and Broad Line Regions for Galaxies in the Sloan Digital Sky Survey's Mapping Nearby Galaxies at Apache Point Observatory Catalog- [electronic resource]
The Physics of the Coronal and Broad Line Regions for Galaxies in the Sloan Digital Sky Survey's Mapping Nearby Galaxies at Apache Point Observatory Catalog- [electronic resource]
상세정보
- 자료유형
- 학위논문
- Control Number
- 0016933524
- International Standard Book Number
- 9798380167000
- Dewey Decimal Classification Number
- 523
- Main Entry-Personal Name
- Negus, James.
- Publication, Distribution, etc. (Imprint
- [S.l.] : University of Colorado at Boulder., 2023
- Publication, Distribution, etc. (Imprint
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- Physical Description
- 1 online resource(200 p.)
- General Note
- Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
- General Note
- Advisor: Comerford, Julia.
- Dissertation Note
- Thesis (Ph.D.)--University of Colorado at Boulder, 2023.
- Restrictions on Access Note
- This item must not be sold to any third party vendors.
- Summary, Etc.
- 요약There is growing evidence that Active Galactic Nucleus (AGN) processes play a vital role in galaxy evolution (e.g., regulating star formation and galactic growth). However, accurate AGN identification is often challenging, as common AGN diagnostics can be confused by contributions from star formation, supernovae, and shocks. However, one promising avenue for identifying the strong ionizing continuum of an AGN are "coronal emission lines" ("CLs"), which are highly ionized species of gas with ionization potentials ≥ 100 eV - above the limit of star formation. Here, I present my graduate work that explores the feasibility of using optical CLs to accurately trace AGNs, using the most extensive optical CL catalogs available, which I assembled using the Sloan Digital Sky Survey's Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) catalog. In this work, I detect CL emission from [NeV], [FeVII], and/ or [FeX] with ≥ 5σ confidence. I focus particularly on the strength and distribution of the CLs; I also provide the fraction of confirmed CL AGNs to showcase the reliability of using CLs to detect AGNs. I then review the physical CL gas properties (e.g., electron temperatures and densities) to deduce the primary mechanism(s) that generate the CLs. Next, I discuss which CLs are ideal for identifying high luminosity AGNs and investigate the role of dust extinction on optical CL detections. I then search for broad Hα and Hβ emission, which trace the high velocity clouds found near the AGN accretion disk, and assemble one of the largest broad line (BL) MaNGA AGN catalogs. I detect 1,042 unique BL galaxies and find that 109 feature BLs from a companion galaxy, not the target MaNGA galaxy (i.e., "offset AGNs"). I conclude by considering how multi-wavelength CL observations (e.g., X-ray and IR) can help to improve AGN identification.
- Subject Added Entry-Topical Term
- Astrophysics.
- Subject Added Entry-Topical Term
- Astronomy.
- Index Term-Uncontrolled
- Active Galactic Nuclei
- Index Term-Uncontrolled
- Broad lines
- Index Term-Uncontrolled
- Coronal emission lines
- Index Term-Uncontrolled
- Galaxies
- Index Term-Uncontrolled
- Photoionization
- Added Entry-Corporate Name
- University of Colorado at Boulder Astrophysical and Planetary Sciences
- Host Item Entry
- Dissertations Abstracts International. 85-03B.
- Host Item Entry
- Dissertation Abstract International
- Electronic Location and Access
- 로그인을 한후 보실 수 있는 자료입니다.
- Control Number
- joongbu:643252
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798380167000
■035 ▼a(MiAaPQ)AAI30530537
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aNegus, James.▼0(orcid)0000-0003-2667-7645
■24510▼aThe Physics of the Coronal and Broad Line Regions for Galaxies in the Sloan Digital Sky Survey's Mapping Nearby Galaxies at Apache Point Observatory Catalog▼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(200 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-03, Section: B.
■500 ▼aAdvisor: Comerford, Julia.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aThere is growing evidence that Active Galactic Nucleus (AGN) processes play a vital role in galaxy evolution (e.g., regulating star formation and galactic growth). However, accurate AGN identification is often challenging, as common AGN diagnostics can be confused by contributions from star formation, supernovae, and shocks. However, one promising avenue for identifying the strong ionizing continuum of an AGN are "coronal emission lines" ("CLs"), which are highly ionized species of gas with ionization potentials ≥ 100 eV - above the limit of star formation. Here, I present my graduate work that explores the feasibility of using optical CLs to accurately trace AGNs, using the most extensive optical CL catalogs available, which I assembled using the Sloan Digital Sky Survey's Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) catalog. In this work, I detect CL emission from [NeV], [FeVII], and/ or [FeX] with ≥ 5σ confidence. I focus particularly on the strength and distribution of the CLs; I also provide the fraction of confirmed CL AGNs to showcase the reliability of using CLs to detect AGNs. I then review the physical CL gas properties (e.g., electron temperatures and densities) to deduce the primary mechanism(s) that generate the CLs. Next, I discuss which CLs are ideal for identifying high luminosity AGNs and investigate the role of dust extinction on optical CL detections. I then search for broad Hα and Hβ emission, which trace the high velocity clouds found near the AGN accretion disk, and assemble one of the largest broad line (BL) MaNGA AGN catalogs. I detect 1,042 unique BL galaxies and find that 109 feature BLs from a companion galaxy, not the target MaNGA galaxy (i.e., "offset AGNs"). I conclude by considering how multi-wavelength CL observations (e.g., X-ray and IR) can help to improve AGN identification.
■590 ▼aSchool code: 0051.
■650 4▼aAstrophysics.
■650 4▼aAstronomy.
■653 ▼aActive Galactic Nuclei
■653 ▼aBroad lines
■653 ▼aCoronal emission lines
■653 ▼aGalaxies
■653 ▼aPhotoionization
■690 ▼a0596
■690 ▼a0606
■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=T16933524▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
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