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The Past, Present, and Groundbreaking Future of OH Megamasers- [electronic resource]
The Past, Present, and Groundbreaking Future of OH Megamasers - [electronic resource]
The Past, Present, and Groundbreaking Future of OH Megamasers- [electronic resource]

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자료유형  
 학위논문파일 국외
최종처리일시  
20240214101254
ISBN  
9798380167055
DDC  
523
저자명  
Roberts, Hayley.
서명/저자  
The Past, Present, and Groundbreaking Future of OH Megamasers - [electronic resource]
발행사항  
[S.l.]: : University of Colorado at Boulder., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(158 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
주기사항  
Advisor: Darling, Jeremy.
학위논문주기  
Thesis (Ph.D.)--University of Colorado at Boulder, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약OH megamasers (OHMs) are luminous masers found in (ultra-)luminous infrared galaxies ([U]LIRGs). OHMs are signposts of major gas-rich mergers associated with some of the most extreme star forming regions in our universe. In the four decades since their discovery, only 120 OHM hosts have been detected at limited redshifts despite numerous searches in an order of magnitude more galaxies. However, the dominant OH masing line, occurring at 1667 MHz, can spoof the 1420 MHz neutral hydrogen (H I) line in untargeted surveys. H I surveys on next-generation radio telescopes, such as the Square Kilometre Array (SKA) and its precursors, will detect unprecedented numbers of OHMs. This surge in detections will not only fundamentally change the landscape of the known OHM population, but will also unlock our ability to implement OHMs as tracers of major mergers and extreme star formation on cosmic scales. Here, I present predictions for the number of OHMs that will be detected by these surveys, as well as novel methods for identifying these interlopers using a k-Nearest Neighbors machine learning algorithm. Preliminary data from H I surveys on precursor SKA telescopes is used to vet and strengthen these methods, resulting in five new OHM detections of sources originally classified as H I emission. I also present two new OHM detections from SKA precursors that showcase this upcoming revolutionary science - whether it be high quality measurements of the OH masing lines or shattering the record for highest redshift OHM detection. I also reexamine the underlying conditions required to steer a major merger on the path to producing an OHM, demonstrating that our previous theories are too simplistic to describe the full population of OHMs hosts. Lastly, I present a comprehensive catalog of all known OHMs and their host galaxies, including their IR and radio properties. This catalog and the inspection of relations between OHMs and their hosts serve as a consolidated, unified resource in the era of new OHM detections.
일반주제명  
Astrophysics.
일반주제명  
Astronomy.
일반주제명  
Planetology.
키워드  
Galaxy mergers
키워드  
OH megamasers
키워드  
Cosmic scales
키워드  
Radio telescopes
키워드  
Star formation
기타저자  
University of Colorado at Boulder Astrophysical and Planetary Sciences
기본자료저록  
Dissertations Abstracts International. 85-03B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

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■035    ▼a(MiAaPQ)AAI30530114
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a523
■1001  ▼aRoberts,  Hayley.▼0(orcid)0000-0003-0046-9848
■24510▼aThe  Past,  Present,  and  Groundbreaking  Future  of  OH  Megamasers▼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(158  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-03,  Section:  B.
■500    ▼aAdvisor:  Darling,  Jeremy.
■5021  ▼aThesis  (Ph.D.)--University  of  Colorado  at  Boulder,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aOH  megamasers  (OHMs)  are  luminous  masers  found  in  (ultra-)luminous  infrared  galaxies  ([U]LIRGs).  OHMs  are  signposts  of  major  gas-rich  mergers  associated  with  some  of  the  most  extreme  star  forming  regions  in  our  universe.  In  the  four  decades  since  their  discovery,  only  120  OHM  hosts  have  been  detected  at  limited  redshifts  despite  numerous  searches  in  an  order  of  magnitude  more  galaxies.  However,  the  dominant  OH  masing  line,  occurring  at  1667  MHz,  can  spoof  the  1420  MHz  neutral  hydrogen  (H  I)  line  in  untargeted  surveys.  H  I  surveys  on  next-generation  radio  telescopes,  such  as  the  Square  Kilometre  Array  (SKA)  and  its  precursors,  will  detect  unprecedented  numbers  of  OHMs.  This  surge  in  detections  will  not  only  fundamentally  change  the  landscape  of  the  known  OHM  population,  but  will  also  unlock  our  ability  to  implement  OHMs  as  tracers  of  major  mergers  and  extreme  star  formation  on  cosmic  scales.  Here,  I  present  predictions  for  the  number  of  OHMs  that  will  be  detected  by  these  surveys,  as  well  as  novel  methods  for  identifying  these  interlopers  using  a  k-Nearest  Neighbors  machine  learning  algorithm.  Preliminary  data  from  H  I  surveys  on  precursor  SKA  telescopes  is  used  to  vet  and  strengthen  these  methods,  resulting  in  five  new  OHM  detections  of  sources  originally  classified  as  H  I  emission.  I  also  present  two  new  OHM  detections  from  SKA  precursors  that  showcase  this  upcoming  revolutionary  science  -  whether  it  be  high  quality  measurements  of  the  OH  masing  lines  or  shattering  the  record  for  highest  redshift  OHM  detection.  I  also  reexamine  the  underlying  conditions  required  to  steer  a  major  merger  on  the  path  to  producing  an  OHM,  demonstrating  that  our  previous  theories  are  too  simplistic  to  describe  the  full  population  of  OHMs  hosts.  Lastly,  I  present  a  comprehensive  catalog  of  all  known  OHMs  and  their  host  galaxies,  including  their  IR  and  radio  properties.  This  catalog  and  the  inspection  of  relations  between  OHMs  and  their  hosts  serve  as  a  consolidated,  unified  resource  in  the  era  of  new  OHM  detections.
■590    ▼aSchool  code:  0051.
■650  4▼aAstrophysics.
■650  4▼aAstronomy.
■650  4▼aPlanetology.
■653    ▼aGalaxy  mergers
■653    ▼aOH  megamasers
■653    ▼aCosmic  scales
■653    ▼aRadio  telescopes
■653    ▼aStar  formation
■690    ▼a0596
■690    ▼a0606
■690    ▼a0590
■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=T16933504▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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