eprintid: 24468
rev_number: 17
eprint_status: archive
userid: 3743
dir: disk0/00/02/44/68
datestamp: 2018-05-14 09:51:52
lastmod: 2018-07-09 12:31:01
status_changed: 2018-05-14 09:51:52
type: doctoralThesis
metadata_visibility: show
creators_name: Gutcke, Thales Nion Ada
title: The quenching of star formation in galaxies
subjects: ddc-000
subjects: ddc-520
subjects: ddc-530
divisions: i-130001
adv_faculty: af-13
cterms_swd: Galaxie
cterms_swd: Sternentstehung
cterms_swd: Computersimulation
cterms_swd: Hydrodynamik
cterms_swd: Smoothed Particle Hydrodynamics
abstract: This thesis is concerned with investigating what makes star formation inefficient in galaxies. Cosmological, hydrodynamical simulations of galaxy formation show that the energy produced in stars, supernova explosions and active galactic nuclei must couple back into a galaxy’s interstellar medium to prevent excess star formation. However, the physical processes at work in this feedback loop are not well understood. This thesis unravels the details of the baryon cycle to constrain the strength
of feedback. The first part explores a phenomenological model of star formation quenching in massive galaxies, showing that gas starvation is a viable pathway to realistic elliptical galaxies. In the second part, a state-of-the-art implementation of stellar feedback is put to the test by comparing the chemical composition of the circum-galactic medium with the latest observations. The simulations exhibit a deficiency in highly ionized oxygen, indicating that models of thermally coupled feedback may be insufficient. The last part delves into the star formation prescription itself, since this directly affects the resulting stellar feedback cycle. An empirical model of a metallicity-dependent stellar initial mass function reveals the significant uncertainty resulting from the common assumption
of its universality. Thus, this analysis links star formation processes with stellar feedback and shows how they affect the baryon cycle of entire galaxy ecosystems.
date: 2018
id_scheme: DOI
id_number: 10.11588/heidok.00024468
ppn_swb: 1654420638
own_urn: urn:nbn:de:bsz:16-heidok-244685
date_accepted: 2018-05-02
advisor: HASH(0x55d997c6e7b8)
language: eng
bibsort: GUTCKETHALTHEQUENCHI2018
full_text_status: public
place_of_pub: Heidelberg
citation:   Gutcke, Thales Nion Ada  (2018) The quenching of star formation in galaxies.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/24468/1/PhD.pdf