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Realizing the Full Potential: Detecting and Measuring Supermassive Black Holes in Triaxial Galaxies- [electronic resource]
Realizing the Full Potential: Detecting and Measuring Supermassive Black Holes in Triaxial...
Realizing the Full Potential: Detecting and Measuring Supermassive Black Holes in Triaxial Galaxies- [electronic resource]

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자료유형  
 학위논문파일 국외
최종처리일시  
20240214101647
ISBN  
9798380367097
DDC  
523
저자명  
Liepold, Emily Rose.
서명/저자  
Realizing the Full Potential: Detecting and Measuring Supermassive Black Holes in Triaxial Galaxies - [electronic resource]
발행사항  
[S.l.]: : University of California, Berkeley., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(196 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
주기사항  
Advisor: Ma, Chung-Pei.
학위논문주기  
Thesis (Ph.D.)--University of California, Berkeley, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약Supermassive black holes lie at the centers of all elliptical galaxies and are thought to play fundamental roles in guiding the evolution of their host galaxies. A number of well-established empirical scaling relations are known between the mass of the black hole to various galaxy properties, such as the stellar velocity dispersion, the break radius of the light profile, and the bulge mass of the galaxy. The behavior of these relations at their upper end is less well-established as only a handful of black holes above one billion solar masses have been been detected and measured. Galaxies harboring these black holes are now known to frequently have kinematic features which indicate that the galaxies have triaxial intrinsic shapes, while the modelling that has produced these few black hole mass measurements has nearly always assumed axisymmetry. The assumed symmetry of a galaxy has potentially significant impact on the resulting inferred black hole mass. This dissertation follows the development of a code for triaxial Schwarzschild orbit modelling and application of that technique to measure the intrinsic three-dimensional triaxial shape of massive elliptical galaxies simultaneously with the masses of their central supermassive black holes and other parameters which describe their mass distributions.We begin by exploring simpler axisymmetric Schwarzschild models. We found that our adopted Schwarzschild modelling code (TriOS) was frequently ill-behaved when running triaxial models with nearly axisymmetric shapes. To ensure that the code was robust once moving further from axisymmetry, we first focused on refining these axisymmetric models, including making changes to the code to allow for properly axisymmetric models, along the way developing further understanding of the conditions required for proper axisymmetry and then applying the updated code to the massive elliptical galaxy NGC1453, a fast-rotating galaxy in the MASSIVE sample. With the updated code and procedures, we detected a black hole in NGC1453 which was consistent with models using axisymmetric Jeans modelling and consistent with the MBH-σ relation.We then turn to triaxiality. As with the axisymmetric case, we found that a number of procedures within the TriOS code and prior prescriptions for usage of the code lead to erroneous models. Quite significantly, one of the symmetries associated with triaxiality was mis-applied and the mass distributions were mis-constrained in the original code, leading to potential biases in the inferred parameters. We found a triplet of parameters which intuitively specify a particular deprojection of the light profile and allows for efficient searches over the space of allowed intrinsic shapes. We again apply our refinements to NGC1453, finding consistent mass parameters with the axisymmetric case, but now with a constraint on the intrinsic shape which strongly rejects axisymmetry.We finally focus on the massive elliptical galaxies M87, Holmberg 15A, and IC1101, performing observations on them over five years to build comprehensive maps of the stellar kinematics for each galaxy extending from the central region within the black hole's sphere of influence to deep within the dark matter halo. For Holmberg 15A and IC1101, the stellar kinematic maps extend to beyond 50 kpc from the center of the galaxy. Both M87 and Holmberg 15A's velocity fields exhibit prominent kinematic misalignments, a tell-tale indication of triaxiality. We use the TriOS code to perform triaxial Schwarzschild orbit modelling on all three galaxies, adding a new measurement of the black hole mass to the long history of measurements of M87's black hole and measuring the three-dimensional triaxial shape of its stellar halo for the first time, as well as significantly refining the mass measurement of Holmberg 15A* and making the most detailed measurements of the stellar kinematics of IC1101 to date.
일반주제명  
Astrophysics.
일반주제명  
Astronomy.
일반주제명  
Computational physics.
키워드  
Black holes
키워드  
Triaxial galaxies
키워드  
Axisymmetry
키워드  
Galaxy properties
키워드  
Consistent mass parameters
기타저자  
University of California, Berkeley Physics
기본자료저록  
Dissertations Abstracts International. 85-03B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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MARC

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■00520240214101647
■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798380367097
■035    ▼a(MiAaPQ)AAI30633852
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a523
■1001  ▼aLiepold,  Emily  Rose.
■24510▼aRealizing  the  Full  Potential:  Detecting  and  Measuring  Supermassive  Black  Holes  in  Triaxial  Galaxies▼h[electronic  resource]
■260    ▼a[S.l.]:▼bUniversity  of  California,  Berkeley.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(196  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-03,  Section:  B.
■500    ▼aAdvisor:  Ma,  Chung-Pei.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Berkeley,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aSupermassive  black  holes  lie  at  the  centers  of  all  elliptical  galaxies  and  are  thought  to  play  fundamental  roles  in  guiding  the  evolution  of  their  host  galaxies.  A  number  of  well-established  empirical  scaling  relations  are  known  between  the  mass  of  the  black  hole  to  various  galaxy  properties,  such  as  the  stellar  velocity  dispersion,  the  break  radius  of  the  light  profile,  and  the  bulge  mass  of  the  galaxy.  The  behavior  of  these  relations  at  their  upper  end  is  less  well-established  as  only  a  handful  of  black  holes  above  one  billion  solar  masses  have  been  been  detected  and  measured.  Galaxies  harboring  these  black  holes  are  now  known  to  frequently  have  kinematic  features  which  indicate  that  the  galaxies  have  triaxial  intrinsic  shapes,  while  the  modelling  that  has  produced  these  few  black  hole  mass  measurements  has  nearly  always  assumed  axisymmetry.  The  assumed  symmetry  of  a  galaxy  has  potentially  significant  impact  on  the  resulting  inferred  black  hole  mass.  This  dissertation  follows  the  development  of  a  code  for  triaxial  Schwarzschild  orbit  modelling  and  application  of  that  technique  to  measure  the  intrinsic  three-dimensional  triaxial  shape  of  massive  elliptical  galaxies  simultaneously  with  the  masses  of  their  central  supermassive  black  holes  and  other  parameters  which  describe  their  mass  distributions.We  begin  by  exploring  simpler  axisymmetric  Schwarzschild  models.  We  found  that  our  adopted  Schwarzschild  modelling  code  (TriOS)  was  frequently  ill-behaved  when  running  triaxial  models  with  nearly  axisymmetric  shapes.  To  ensure  that  the  code  was  robust  once  moving  further  from  axisymmetry,  we  first  focused  on  refining  these  axisymmetric  models,  including  making  changes  to  the  code  to  allow  for  properly  axisymmetric  models,  along  the  way  developing  further  understanding  of  the  conditions  required  for  proper  axisymmetry  and  then  applying  the  updated  code  to  the  massive  elliptical  galaxy  NGC1453,  a  fast-rotating  galaxy  in  the  MASSIVE  sample.  With  the  updated  code  and  procedures,  we  detected  a  black  hole  in  NGC1453  which  was  consistent  with  models  using  axisymmetric  Jeans  modelling  and  consistent  with  the  MBH-σ  relation.We  then  turn  to  triaxiality.  As  with  the  axisymmetric  case,  we  found  that  a  number  of  procedures  within  the  TriOS  code  and  prior  prescriptions  for  usage  of  the  code  lead  to  erroneous  models.  Quite  significantly,  one  of  the  symmetries  associated  with  triaxiality  was  mis-applied  and  the  mass  distributions  were  mis-constrained  in  the  original  code,  leading  to  potential  biases  in  the  inferred  parameters.  We  found  a  triplet  of  parameters  which  intuitively  specify  a  particular  deprojection  of  the  light  profile  and  allows  for  efficient  searches  over  the  space  of  allowed  intrinsic  shapes.  We  again  apply  our  refinements  to  NGC1453,  finding  consistent  mass  parameters  with  the  axisymmetric  case,  but  now  with  a  constraint  on  the  intrinsic  shape  which  strongly  rejects  axisymmetry.We  finally  focus  on  the  massive  elliptical  galaxies  M87,  Holmberg  15A,  and  IC1101,  performing  observations  on  them  over  five  years  to  build  comprehensive  maps  of  the  stellar  kinematics  for  each  galaxy  extending  from  the  central  region  within  the  black  hole's  sphere  of  influence  to  deep  within  the  dark  matter  halo.  For  Holmberg  15A  and  IC1101,  the  stellar  kinematic  maps  extend  to  beyond  50  kpc  from  the  center  of  the  galaxy.  Both  M87  and  Holmberg  15A's  velocity  fields  exhibit  prominent  kinematic  misalignments,  a  tell-tale  indication  of  triaxiality.  We  use  the  TriOS  code  to  perform  triaxial  Schwarzschild  orbit  modelling  on  all  three  galaxies,  adding  a  new  measurement  of  the  black  hole  mass  to  the  long  history  of  measurements  of  M87's  black  hole  and  measuring  the  three-dimensional  triaxial  shape  of  its  stellar  halo  for  the  first  time,  as  well  as  significantly  refining  the  mass  measurement  of  Holmberg  15A*  and  making  the  most  detailed  measurements  of  the  stellar  kinematics  of  IC1101  to  date.
■590    ▼aSchool  code:  0028.
■650  4▼aAstrophysics.
■650  4▼aAstronomy.
■650  4▼aComputational  physics.
■653    ▼aBlack  holes
■653    ▼aTriaxial  galaxies
■653    ▼aAxisymmetry
■653    ▼aGalaxy  properties
■653    ▼aConsistent  mass  parameters
■690    ▼a0596
■690    ▼a0606
■690    ▼a0216
■71020▼aUniversity  of  California,  Berkeley▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g85-03B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0028
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16934734▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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