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Cosmic Ray Electrons in the Multiphase Interstellar Medium
Cosmic Ray Electrons in the Multiphase Interstellar Medium
Cosmic Ray Electrons in the Multiphase Interstellar Medium

Detailed Information

Material Type  
 단행본
 
0017358876
Date and Time of Latest Transaction  
20260202104804
ISBN  
9798293894468
DDC  
523
Author  
Linzer, Nora B.
Title/Author  
Cosmic Ray Electrons in the Multiphase Interstellar Medium
Publish Info  
[Sl] : Princeton University, 2025
Publish Info  
Ann Arbor : ProQuest Dissertations & Theses, 2025
Material Info  
152 p
General Note  
Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
General Note  
Advisor: Ostriker, Eve C.;Quataert, Eliot.
학위논문주기  
Thesis (Ph.D.)--Princeton University, 2025.
Abstracts/Etc  
요약Cosmic rays (CRs) make up a significant pressure component of the interstellar medium (ISM), on the order of the thermal, turbulent, and magnetic pressures. Therefore, these particles can substantially impact galactic dynamics. Direct observations show that protons make up the majority of the CR population and that there are significantly fewer CR electrons (CREs), so the physical impact of CREs is negligible. Beyond the solar neighborhood, however, CRs cannot be directly measured, and we must rely on indirect probes, primarily radio synchrotron emission produced by the interaction of CREs with local magnetic fields. It is therefore of great importance to understand the evolution of CREs in realistic simulations of the ISM to interpret indirect measurements of the CR population.In this work, we present a scheme for modeling the transport and spectral evolution of CREs in the magnetized, multiphase ISM which we use to post-process TIGRESS simulations of multiple galactic environments. In Chapter 2, we lay out our two-moment transport method which includes advection, streaming, and diffusion, as well as various energetic loss mechanisms. We post-process TIGRESS models representative of solar neighborhood conditions and find the simulated CRE spectrum to be consistent with direct observations. In Chapter 3, we produce synthetic synchrotron emission which we use to test common observational methods including the extraction of the CRE spectrum from radio observations, as well as the estimation of magnetic field strength through the equipartition assumption. In Chapter 4, we apply our CR modeling scheme to TIGRESS simulations representative of inner galaxy conditions to understand how CRE transport may differ as a function of environment. Finally, we present opportunities for future analysis in Chapter 5.
Subject Added Entry-Topical Term  
Astrophysics
Subject Added Entry-Topical Term  
Applied physics
Subject Added Entry-Topical Term  
Astronomy
Index Term-Uncontrolled  
Interstellar medium
Index Term-Uncontrolled  
Cosmic rays
Index Term-Uncontrolled  
Protons
Added Entry-Corporate Name  
Princeton University Astrophysical Sciences
Host Item Entry  
Dissertations Abstracts International. 87-04B.
Electronic Location and Access  
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MARC

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■1001  ▼aLinzer,  Nora  B.▼0(orcid)0000-0001-8840-2538
■24510▼aCosmic  Ray  Electrons  in  the  Multiphase  Interstellar  Medium
■260    ▼a[Sl]▼bPrinceton  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a152  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-04,  Section:  B.
■500    ▼aAdvisor:  Ostriker,  Eve  C.;Quataert,  Eliot.
■5021  ▼aThesis  (Ph.D.)--Princeton  University,  2025.
■520    ▼aCosmic  rays  (CRs)  make  up  a  significant  pressure  component  of  the  interstellar  medium  (ISM),  on  the  order  of  the  thermal,  turbulent,  and  magnetic  pressures.  Therefore,  these  particles  can  substantially  impact  galactic  dynamics.  Direct  observations  show  that  protons  make  up  the  majority  of  the  CR  population  and  that  there  are  significantly  fewer  CR  electrons  (CREs),  so  the  physical  impact  of  CREs  is  negligible.  Beyond  the  solar  neighborhood,  however,  CRs  cannot  be  directly  measured,  and  we  must  rely  on  indirect  probes,  primarily  radio  synchrotron  emission  produced  by  the  interaction  of  CREs  with  local  magnetic  fields.  It  is  therefore  of  great  importance  to  understand  the  evolution  of  CREs  in  realistic  simulations  of  the  ISM  to  interpret  indirect  measurements  of  the  CR  population.In  this  work,  we  present  a  scheme  for  modeling  the  transport  and  spectral  evolution  of  CREs  in  the  magnetized,  multiphase  ISM  which  we  use  to  post-process  TIGRESS  simulations  of  multiple  galactic  environments.  In  Chapter  2,  we  lay  out  our  two-moment  transport  method  which  includes  advection,  streaming,  and  diffusion,  as  well  as  various  energetic  loss  mechanisms.  We  post-process  TIGRESS  models  representative  of  solar  neighborhood  conditions  and  find  the  simulated  CRE  spectrum  to  be  consistent  with  direct  observations.  In  Chapter  3,  we  produce  synthetic  synchrotron  emission  which  we  use  to  test  common  observational  methods  including  the  extraction  of  the  CRE  spectrum  from  radio  observations,  as  well  as  the  estimation  of  magnetic  field  strength  through  the  equipartition  assumption.  In  Chapter  4,  we  apply  our  CR  modeling  scheme  to  TIGRESS  simulations  representative  of  inner  galaxy  conditions  to  understand  how  CRE  transport  may  differ  as  a  function  of  environment.  Finally,  we  present  opportunities  for  future  analysis  in  Chapter  5.
■590    ▼aSchool  code:  0181.
■650  4▼aAstrophysics
■650  4▼aApplied  physics
■650  4▼aAstronomy
■653    ▼aInterstellar  medium
■653    ▼aCosmic  rays
■653    ▼aProtons
■690    ▼a0596
■690    ▼a0215
■690    ▼a0606
■71020▼aPrinceton  University▼bAstrophysical  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g87-04B.
■790    ▼a0181
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358876▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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