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Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes- [electronic resource]
Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes - [e...
Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes- [electronic resource]

Detailed Information

자료유형  
 학위논문파일 국외
최종처리일시  
20240214100439
ISBN  
9798379612573
DDC  
523
저자명  
Palumbo, Daniel.
서명/저자  
Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes - [electronic resource]
발행사항  
[S.l.]: : Harvard University., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(226 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
주기사항  
Advisor: Johnson, Michael.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약Supermassive black hole (SMBH) event horizons are now observationally accessible. The Event Horizon Telescope (EHT) has recently imaged the two known black holes of largest angular size with very-long-baseline interferometry (VLBI): that in Messier 87 (M 87*), and in our own Galactic Center (Sgr A*). In this thesis, I develop observational and theoretical tools for studies of synchrotron emission from SMBH accretion flows. Together, these results yield promising pathways to measurements of black hole spin and the accretion magnetization state, crucial properties that encode the accretion and merger history of the black hole. First, I specify a Fourier decomposition of rotational polarization structure in images of modestly inclined accretion flows. I find that spiral structure in synchrotron polarization directly probes both accretion magnetization and spin. Next, I demonstrate that lensing symmetries of the Penrose-Walker constant in axisymmetric equatorial flows simplify to a polarization B-mode antisymmetry that is apparent in the strongly lensed "photon rings" of favored simulations for M 87* and Sgr A*. I then propose a VLBI experiment that could use these symmetries to detect the photon ring. Finally, I develop a semi-analytic equatorial disk model for optically thin accretion flows. I embed this model in an inference framework to measure black hole mass, spin, inclination, and magnetic field geometry directly from interferometric data. I conclude with an overview of recent and forthcoming observational results using these techniques, including the EHT's measurement of the magnetization state of M 87*.
일반주제명  
Astrophysics.
일반주제명  
Astronomy.
키워드  
Black holes
키워드  
Interferometry
키워드  
Polarization
키워드  
Supermassive black hole
기타저자  
Harvard University Astronomy
기본자료저록  
Dissertations Abstracts International. 84-12B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■00520240214100439
■006m          o    d                
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■020    ▼a9798379612573
■035    ▼a(MiAaPQ)AAI30491073
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a523
■1001  ▼aPalumbo,  Daniel.▼0(orcid)0000-0002-7179-3816
■24510▼aInterferometric  Measurement  of  the  Magnetization  and  Spin  of  Supermassive  Black  Holes▼h[electronic  resource]
■260    ▼a[S.l.]:▼bHarvard  University.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(226  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  84-12,  Section:  B.
■500    ▼aAdvisor:  Johnson,  Michael.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aSupermassive  black  hole  (SMBH)  event  horizons  are  now  observationally  accessible.  The  Event  Horizon  Telescope  (EHT)  has  recently  imaged  the  two  known  black  holes  of  largest  angular  size  with  very-long-baseline  interferometry  (VLBI):  that  in  Messier  87  (M  87*),  and  in  our  own  Galactic  Center  (Sgr  A*).  In  this  thesis,  I  develop  observational  and  theoretical  tools  for  studies  of  synchrotron  emission  from  SMBH  accretion  flows.  Together,  these  results  yield  promising  pathways  to  measurements  of  black  hole  spin  and  the  accretion  magnetization  state,  crucial  properties  that  encode  the  accretion  and  merger  history  of  the  black  hole.  First,  I  specify  a  Fourier  decomposition  of  rotational  polarization  structure  in  images  of  modestly  inclined  accretion  flows.  I  find  that  spiral  structure  in  synchrotron  polarization  directly  probes  both  accretion  magnetization  and  spin.  Next,  I  demonstrate  that  lensing  symmetries  of  the  Penrose-Walker  constant  in  axisymmetric  equatorial  flows  simplify  to  a  polarization  B-mode  antisymmetry  that  is  apparent  in  the  strongly  lensed  "photon  rings"  of  favored  simulations  for  M  87*  and  Sgr  A*.  I  then  propose  a  VLBI  experiment  that  could  use  these  symmetries  to  detect  the  photon  ring.  Finally,  I  develop  a  semi-analytic  equatorial  disk  model  for  optically  thin  accretion  flows.  I  embed  this  model  in  an  inference  framework  to  measure  black  hole  mass,  spin,  inclination,  and  magnetic  field  geometry  directly  from  interferometric  data.  I  conclude  with  an  overview  of  recent  and  forthcoming  observational  results  using  these  techniques,  including  the  EHT's  measurement  of  the  magnetization  state  of  M  87*.
■590    ▼aSchool  code:  0084.
■650  4▼aAstrophysics.
■650  4▼aAstronomy.
■653    ▼aBlack  holes
■653    ▼aInterferometry
■653    ▼aPolarization
■653    ▼aSupermassive  black  hole
■690    ▼a0596
■690    ▼a0606
■71020▼aHarvard  University▼bAstronomy.
■7730  ▼tDissertations  Abstracts  International▼g84-12B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16932294▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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