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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]

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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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■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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