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 Unseen- [electronic resource]
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214101913
- ISBN
- 9798380361057
- DDC
- 523
- 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
- 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.