상세정보
Export to Refworks부가기능
The Impact of Stellar Feedback on Galaxies and Dark Matter Halos
상세 프로파일
| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | The Impact of Stellar Feedback on Galaxies and Dark Matter Halos. |
| 개인저자 | Chan, Tsang Keung. |
| 단체저자명 | University of California, San Diego. Physics. |
| 발행사항 | [S.l.]: University of California, San Diego., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 227 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-05B. Dissertation Abstract International |
| ISBN | 9781088378069 |
| 학위논문주기 | Thesis (Ph.D.)--University of California, San Diego, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
Advisor: Keres, Dusan. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | In Chapter 2, we study the inner dark matter profiles of galaxies with halo masses between 1e9-1e12Msun and stellar masses between 1e4-1e11Msun in the "Feedback In Realistic Environment'' (FIRE) cosmological simulations. We find repeated episodes of feedback-driven outflows can transfer energy to DM and flatten the inner DM profiles. kpc-size DM cores form in galaxies with halo masses similar 1e11Msun, since feedback energy is sufficient to reduce inner DM density. At halo mass similar to 1e12 Msun, baryonic infall into halo center can contract DM halos, which effectively cancel the effect from feedback, producing DM profiles close to the Navarro-Frenk-White (NFW) profile.In Chapter 3, we study the formation mechanism of the ultra diffuse galaxies (UDGs) with galaxies with the z=0 stellar masses between 1e4-1e11Msun in the cosmological FIRE simulations. We show dwarf galaxies with stellar mass similar to 1e8 Msun, expanded by stellar feedback, quenched, and then passively evolving in galaxy clusters, can reproduce the properties of "red'' UDGs. We find if those dwarf galaxies are not quenched, they produce blue diffuse galaxies, which could be prevalent in the field environment.In Chapter 4, we present the first implementation of the cosmic ray (CR) feedback in the FIRE simulation. We study non cosmological simulations of dwarf, dwarf starburst, and Lstar galaxies with CR feedback, including advection, isotropic/anisotropic diffusion, and/or streaming. We constrain CR propagation models by comparing the simulated star formation rate and GeV gamma-ray emission with the observed nearby and starburst galaxies. We find the ``effective'' isotropic diffusion coefficients to be around 3e29cm2/s to match the observations. |
| 일반주제명 | Astronomy. Astrophysics. |
| 언어 | 영어 |
| 바로가기 | 
: 이 자료의 원문은 한국교육학술정보원에서 제공합니다. |
