Physical Sciences and Mathematics Commons^™

Galaxy Evolution At High-Redshift: Millimeter-Wavelength Surveys With The Aztec Camera, Kimberly S Scott

Doctoral Dissertations 1896 - February 2014

Galaxies detected by their thermal dust emission at submillimeter (submm) and millimeter (mm) wavelengths comprise a population of massive, intensely star-forming systems in the early Universe. These "submm/mm-galaxies", or SMGs, likely represent an important phase in the assembly and/or evolution of massive galaxies and are thought to be the progenitors of massive elliptical galaxies. While their projected number density as a function of source brightness provides key constraints on models of galaxy evolution, SMG surveys carried out over the past twelve years with the first generation of submm/mm-wavelength cameras have not imaged a large enough area to sufficient depths to …

The Role Of Stellar Feedback In Galaxy Evolution, Zhiyuan Li

Doctoral Dissertations 1896 - February 2014

Aiming at understanding the role of stellar feedback in galaxy evolution, I present a study of the hot interstellar medium in several representative galaxies, based primarily on X-ray observations as well as theoretical modelling.

I find that, in the massive disk galaxies NGC2613 and M104, the observed amount of hot gas is much less than that predicted by current galaxy formation models. Such a discrepancy suggests a lack of appropriate treatments of stellar/AGN feedback in these models.

I also find that stellar feedback, primarily in the form of mass loss from evolved stars and energy released from supernovae, and presumably …