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A New Search for Transient Sources of Astrophysical Neutrinos
A New Search for Transient Sources of Astrophysical Neutrinos
A New Search for Transient Sources of Astrophysical Neutrinos

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105329
ISBN  
9798263323943
DDC  
520
저자명  
Brinson, Bennett.
서명/저자  
A New Search for Transient Sources of Astrophysical Neutrinos
발행사항  
[Sl] : Georgia Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
237 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: Taboada, Ignacio.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2025.
초록/해제  
요약The emerging field of high-energy neutrino astronomy has seen many advances in the last few years, led by the IceCube collaboration, including the identification of several neutrino source candidates. However, the sources that contribute to the astrophysical diffuse neutrino flux are still largely unknown. This dissertation discusses three efforts to identify these astrophysical neutrino sources. The first is an upgrade to IceCube's processing and filtering pipeline to improve the future collection of track-like data with good angular resolution. The filter I was responsible for, known as the Muon Filter, is the single most used data stream in IceCube, and I was responsible for modernizing and improving this filter for the first time since it was finalized in 2013. The second is a search for neutrino emission from GRB 221009A, the brightest GRB of all time, in the 10-1000 GeV range based on prior work conducted by Dr. Chujie Chen. This work set upper limits on neutrino emission from this GRB. Thanks to this GRB's exceptional brightness, I was able to use these upper limits to place strong constraints on GRB 221009A's baryon loading. A high baryon loading is needed if GRBs are a source of the highest-energy cosmic rays. The final effort was to identify neutrino transients across the entire sky. IceCube has conducted several such searches in the past, however I implement several improvements in sensitivity including the Pass2 data reprocessing effort, the improved point-source reconstruction methods, the KDE parametrization of the likelihood, and the expectation maximization method for picking flare durations, which combined give a ∼ 30% improvement in discovery potential compared to previous results. This work searches for evidence of transient neutrino emission from three catalogs of sources, including Seyfert galaxies, blazars, and a generic catalog of gamma-ray bright sources based on prior evidence of neutrino emission from the blazar TXS 0506+056 and the Seyfert-II galaxy NGC 1068. No significant evidence of neutrino emission is observed from any single source, and upper limits are placed on the most significant sources in each catalog for several time windows. However, evidence of excess neutrino emission at the 3.3σ level is identified for a sub-population of three Seyfert galaxies: NGC 7469, NGC 4151, and NGC 1068. This work is currently being prepared for future publication, which will also include a search for transient neutrino emission across the entire northern sky.
일반주제명  
Astronomy
일반주제명  
Charged particles
일반주제명  
Observatories
일반주제명  
Cosmic rays
일반주제명  
Maximum likelihood method
일반주제명  
Gamma rays
일반주제명  
Neutrinos
일반주제명  
Energy
일반주제명  
Radiation
일반주제명  
Astrophysics
일반주제명  
Atomic physics
일반주제명  
Nuclear physics
일반주제명  
Particle physics
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
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MARC

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■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2025.
■520    ▼aThe  emerging  field  of  high-energy  neutrino  astronomy  has  seen  many  advances  in  the  last  few  years,  led  by  the  IceCube  collaboration,  including  the  identification  of  several  neutrino  source  candidates.  However,  the  sources  that  contribute  to  the  astrophysical  diffuse  neutrino  flux  are  still  largely  unknown.  This  dissertation  discusses  three  efforts  to  identify  these  astrophysical  neutrino  sources.  The  first  is  an  upgrade  to  IceCube's  processing  and  filtering  pipeline  to  improve  the  future  collection  of  track-like  data  with  good  angular  resolution.  The  filter  I  was  responsible  for,  known  as  the  Muon  Filter,  is  the  single  most  used  data  stream  in  IceCube,  and  I  was  responsible  for  modernizing  and  improving  this  filter  for  the  first  time  since  it  was  finalized  in  2013.  The  second  is  a  search  for  neutrino  emission  from  GRB  221009A,  the  brightest  GRB  of  all  time,  in  the  10-1000  GeV  range  based  on  prior  work  conducted  by  Dr.  Chujie  Chen.  This  work  set  upper  limits  on  neutrino  emission  from  this  GRB.  Thanks  to  this  GRB's  exceptional  brightness,  I  was  able  to  use  these  upper  limits  to  place  strong  constraints  on  GRB  221009A's  baryon  loading.  A  high  baryon  loading  is  needed  if  GRBs  are  a  source  of  the  highest-energy  cosmic  rays.  The  final  effort  was  to  identify  neutrino  transients  across  the  entire  sky.  IceCube  has  conducted  several  such  searches  in  the  past,  however  I  implement  several  improvements  in  sensitivity  including  the  Pass2  data  reprocessing  effort,  the  improved  point-source  reconstruction  methods,  the  KDE  parametrization  of  the  likelihood,  and  the  expectation  maximization  method  for  picking  flare  durations,  which  combined  give  a  ∼  30%  improvement  in  discovery  potential  compared  to  previous  results.  This  work  searches  for  evidence  of  transient  neutrino  emission  from  three  catalogs  of  sources,  including  Seyfert  galaxies,  blazars,  and  a  generic  catalog  of  gamma-ray  bright  sources  based  on  prior  evidence  of  neutrino  emission  from  the  blazar  TXS  0506+056  and  the  Seyfert-II  galaxy  NGC  1068.  No  significant  evidence  of  neutrino  emission  is  observed  from  any  single  source,  and  upper  limits  are  placed  on  the  most  significant  sources  in  each  catalog  for  several  time  windows.  However,  evidence  of  excess  neutrino  emission  at  the  3.3σ  level  is  identified  for  a  sub-population  of  three  Seyfert  galaxies:  NGC  7469,  NGC  4151,  and  NGC  1068.  This  work  is  currently  being  prepared  for  future  publication,  which  will  also  include  a  search  for  transient  neutrino  emission  across  the  entire  northern  sky.
■590    ▼aSchool  code:  0078.
■650  4▼aAstronomy
■650  4▼aCharged  particles
■650  4▼aObservatories
■650  4▼aCosmic  rays
■650  4▼aMaximum  likelihood  method
■650  4▼aGamma  rays
■650  4▼aNeutrinos
■650  4▼aEnergy
■650  4▼aRadiation
■650  4▼aAstrophysics
■650  4▼aAtomic  physics
■650  4▼aNuclear  physics
■650  4▼aParticle  physics
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■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360257▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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