Teet Kuutma successfully defended PhD thesis "Galaxies and non-galactic baryons in cosmic filaments"

On Thursday, November 4, Tartu Observatory's Engineer Teet Kuutma successfully defended his PhD dissertation "Galaxies and non-galactic baryons in cosmic filaments". The defence gained him a doctoral degree in physics from the University of Tartu. The defence took place both in person at Tartu Observatory in Tõravere and virtually in Zoom.

Supervisor:
Dr. Antti Tamm, Tartu Observatory, University of Tartu,

Opponent:
Dr. Pasi Nurmi, Department of Physics and Astronomy, University of Turku
 

Summary

Galaxies are some of the most interesting objects visible in the sky. They have different shapes, from cartwheel or CD-like disky spirals to featureless egg-shaped ellipticals. One hundred years ago the distances of galaxies were first measured and it became apparent that they are collections of stars at vast distances from us. Even the Sun is located within a galaxy, the Milky Way, which is just one of billions of other galaxies in our universe. Sky surveys with telescopes have measured exact positions of galaxies. From these we know that galaxies are not situated randomly, but in preferred configurations. Some are in dense associations, clusters. Clusters are connected by long chains of galaxies, filaments. There are regions where there are very few or no galaxies at all, voids. This configuration can be imagined as similar to human populations on Earth, where the clusters are big cities, filaments highways with nearby towns and the voids regions of sparse inhabitation.

It has also been determined that galaxies differ based on the density of their environment. In clusters galaxies are more likely in a later stage of evolution: larger and older. Voids in contrast are territories of small young galaxies. Filaments are intermediate, where many different types of galaxies are found. Filaments also inhabit a variety of environments, inside voids and between dense clusters. The goal of this thesis is to characterise galaxies in filaments. It is still not well understood how the filament environment affects the evolution of galaxies. In order to gain insight into this problem we utilised publicly available observational data and the expertise of the scientists at the University of Tartu, Tartu Observatory in identifying galaxy configurations. As the result of this work we found that galaxies in filaments are less star forming and generally more evolved than would be expected based on density alone. However more research is needed to fully understand the nature of galaxies.

Read the dissertation at DSpace.