본문

Light From Dark Stars and Light Through Dark Matter: Emission as a Tool to Study the Unseen- [electronic resource]
Light From Dark Stars and Light Through Dark Matter: Emission as a Tool to Study the Unsee...
내용보기
Light From Dark Stars and Light Through Dark Matter: Emission as a Tool to Study the Unseen- [electronic resource]
자료유형  
 학위논문파일 국외
최종처리일시  
20240214101913
ISBN  
9798380361057
DDC  
523
저자명  
Dike, Veronica Jane.
서명/저자  
Light From Dark Stars and Light Through Dark Matter: Emission as a Tool to Study the Unseen - [electronic resource]
발행사항  
[S.l.]: : University of California, Los Angeles., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(90 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
주기사항  
Advisor: Treu, Tommaso.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약This thesis presents progress in two subfields of astrophysics, first in galactic astronomy, describing how a large survey of ground-state silicon monoxide emission can probe asymptotic giant branch stellar envelope expansion, and second in observational cosmology, presenting novel constraints on primordial black holes (PBH) as a fraction of dark matter by leveraging strong gravitational lensing. The Galactic project searched the Very Large Array Bulge Asymmetries and Dynamical Evolution (BAaDE) survey for maser and thermal emission from the J = 1−0, v = 0 ground vibrational state transition. I present results characterizing these sources as a nearby disk population and derive the expansion velocity of the emission region by fitting thermal components of lines to an emission model. For the small number of sources with corresponding carbon monoxide emission, I find the expansion velocities to be similar for both the thermal SiO and CO, evidence that both emissions are produced in the same region above the star where the gas has reached terminal velocity. In the cosmology portion of the thesis, the objective is to use a flux-ratio analysis to put constraints on intermediate-mass PBH as a possible fraction of dark matter. A population of PBH within the dark matter halo of a lensing galaxy would affect the magnification, and therefore the flux ratios, of the images in a quadruply-imaged quasar (quad). By forward-modeling the flux ratios using an Approximate Bayesian Computing technique, I obtain a constraint on PBH within the mass range of 104M⊙ MPBH 106M⊙ being less than 0.17% of the dark matter with 95% confidence. In addition to the flux-ratio anomaly, the gravitational interaction they would exert over cosmic history would create many different observable effects. I present a stronger limit in the above intermediate-mass range by combining limits from indpendent PBH probes. I also discuss the improved constraining power that JWST lenses will have on the flux-ratio anomaly constraint.
일반주제명  
Astrophysics.
일반주제명  
Astronomy.
일반주제명  
Physics.
일반주제명  
Planetology.
키워드  
Galactic astronomy
키워드  
Primordial black holes
키워드  
Lensing galaxy
키워드  
Dark stars
키워드  
Thermal emission
기타저자  
University of California, Los Angeles Astronomy and Astrophysics 00EB
기본자료저록  
Dissertations Abstracts International. 85-03B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.
신착도서 더보기
최근 3년간 통계입니다.

소장정보

  • 예약
  • 소재불명신고
  • 나의폴더
  • 우선정리요청
  • 비도서대출신청
  • 야간 도서대출신청
소장자료
등록번호 청구기호 소장처 대출가능여부 대출정보
TF08135 전자도서
마이폴더 부재도서신고 비도서대출신청

* 대출중인 자료에 한하여 예약이 가능합니다. 예약을 원하시면 예약버튼을 클릭하십시오.

해당 도서를 다른 이용자가 함께 대출한 도서

관련 인기도서

로그인 후 이용 가능합니다.