Defence of Teet Kuutma's PhD dissertation "Galaxies and non-galactic baryons in cosmic filaments" | Tartu Observatory

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Contacts of UT units

Faculty of Arts and Humanities
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+372 737 5341
Faculty address: 
Jakobi 2, rooms 116–121, 51005 Tartu
  • Dean's Office
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    Faculty address: 
    Jakobi 2, rooms 116–121, 51005 Tartu
  • Institute of History and Archaeology
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    Jakobi 2, 51005 Tartu
  • Institute of Estonian and General Linguistics
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    Jakobi 2, 51005 Tartu
  • Institute of Philosophy and Semiotics
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    Jakobi 2, rooms 309–352, 51005 Tartu
  • Institute of Cultural Research
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    Ülikooli 16, 51003 Tartu
  • School of Theology and Religious Studies
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    +372 737 5301
    Faculty address: 
    Ülikooli 18–310, 50090 Tartu
  • College of Foreign Languages and Cultures
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    J. Liivi 4, 50409, Tartu
  • Viljandi Culture Academy
    Faculty phone: 
    +372 435 5232
    Faculty address: 
    Posti 1, 71004 Viljandi
Faculty of Social Sciences
Faculty phone: 
+372 737 5957
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Lossi 36, 51003 Tartu
  • Dean's Office
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    Faculty address: 
    Lossi 36, 51003 Tartu
  • Institute of Education
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    Salme 1a–29, 50103 Tartu
  • Johan Skytte Institute of Political Studies
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  • School of Economics and Business Administration
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Faculty of Science and Technology
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  • Dean's Office
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  • Institute of Computer Science
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  • Estonian Marine Institute
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  • Institute of Physics
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  • Institute of Genomics
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  • Institute of Mathematics and Statistics
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Institutions
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    W. Struve 1, 50091 Tartu
  • Youth Academy
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    Faculty address: 
    Uppsala 10, 51003 Tartu
  • Museum
    Faculty phone: 
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    Faculty address: 
    Lossi 25, 51003 Tartu
  • University of Tartu Natural History Museum and Botanical Garden
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    Faculty address: 
    Vanemuise 46, 51003 Tartu
Support Units
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  • Centre for Entrepreneurship and Innovation
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    Faculty address: 
    Narva mnt 18, 51009, Tartu
  • University Office in Tallinn
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    Faculty address: 
    Teatri väljak 3, 10143 Tallinn
  • Estates Office
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  • Office of Academic Affairs
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    Faculty address: 
    Ülikooli 18, 50090 Tartu
  • Procurement Office
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    Ülikooli 18a, 51005 Tartu
  • Rector's Strategy Office
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  • Student Council
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  • University of Tartu Press
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    Faculty address: 
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Other Units
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  • Tartu University Hospital
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  • View all other units

Defence of Teet Kuutma's PhD dissertation "Galaxies and non-galactic baryons in cosmic filaments"

Date: 
04.11.2021 - 14:15

On November 4 at 2.15 PM, Teet Kuutma will defend his PhD dissertation "Galaxies and non-galactic baryons in cosmic filaments". A successful defence will gain him a doctoral degree in physics from the University of Tartu. The defence will take 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.

Attend the defence in Zoom

Organizer: 
Tartu Obsevatory
Location: 
Tõravere, Tartu Observatory; MS Teams
URL: 
https://ut-ee.zoom.us/j/96677336005?pwd=WGswVHZMeUlFNjlpNVYybzQzSHF1QT09
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