The distributions of stellar remnants in disk galaxies

Abstract

This thesis presents an account of work on the distribution of supernova remnants in galaxies. It consists of 3 parts, the identification of runaway stars in galaxies and then the modelling of the expected distribution of these stars around a galaxy and their expected dispersion over time. The first part of the thesis is a thorough survey of supernovae in the Asiago database and identification of those that are located away from the plane of the galaxy. He investigated their height and radial distribution relative to the galaxy and confirmed previous work with a larger sample size. The rest of the work involved computer modelling of the distribution of star remnants and runaway objects in galaxies and the time evolution of their distribution. It concluded that the radial distribution of remnants would be similar to thar of the stars in the galaxy but their height distribution would be larger indicating sufficient velocity to escape from the disk. Despite their larger velocity relative to surrounding stars, the time evolution of the HMXB spatial distribution shows a similar pattern to that of the stars in the galaxy