Lauri Juhan Liivamägi defended his doctoral thesis titled “Properties and spatial distribution of galaxy superclusters”Tiia Lillemaa | 22.02.2017
On 21 February 2017 Lauri Juhan Liivamägi defended at University of Tartu his doctoral thesis titled “Properties and spatial distribution of galaxy superclusters”.
Supervisor: dr Enn Saar, Tartu Observatory Opponents: dr Andi Hektor, NIBF dr Maciei Bilicki, Leiden University, Holland Summary: Astronomy is a science that can offer plenty of unfo...
Margit Aun defended doctoral thesis titled "Dependence of UV radiation on climate factors.Reconstruction of UV doses in Estonia for past years"Tiia Lillemaa | 20.02.2017
On 17 February 2016 junior researcher of Tartu Observatory Margit Aun defended her doctoral thesis titled "Dependence of UV radiation on climate factors. Reconstruction of UV doses in Estoni...
Supervisors:dr Kalju Eerme, Tartu Observatorydr Hanno Ohvril, Institute of Physics, University of Tartu Oponents: dr Kaisa Lakkala, Finnish Meteorology Institut, Finlanddr Enn Kaup,...
Tiia Lillemaa | 10.02.2017
The government approved the national science awards this year's laureates. National Science Award in the field of exact sciences was awarded to the Tartu Observatory Senior Research Fellow Elmo Tempel...
The national science award in exact sciences was awarded to the Tartu Observatory Senior Research Fellow Elmo Tempel for cycle of works "Galactic Filaments in the Cosmic Network". In his work, he ana...
We, 22.02.2017 at 15:00
Maciej Bilicki, Leiden Observatory. All-sky galaxy catalogues in 3D and their applications
Many cosmological problems require three-dimensional all-sky galaxy catalogues reaching beyond the very local universe. As the currently deepest all-sky spectroscopic survey (2MRS) has mean z=0.03 only, such datasets at larger redshifts and covering more than 2pi sterad are available only from combining imaging surveys at different wavelengths and estimating photometric redshifts (photo-zs). I will present two such photo-z catalogues - 2MPZ and WISE x SuperCOSMOS - which are unique in terms of their combination of sky coverage (respectively ~4pi and ~3pi sterad) and depth (z<0.2 and z<0.4). They are continuously finding various cosmological uses, and I will discuss some of them, in particular those that I am involved in. These include detailed local cosmography (crucial in the recent discovery of the Vela Supercluster); universal isotropy and homogeneity tests; cross-correlations with other all-sky datasets, such as Planck CMB lensing or Fermi gamma-ray background; and even searches for electromagnetic counterparts of gravitational wave emitters.
Th, 16.02.2017 at 14:00
Ain Kallis. What will the Estonian climate be like in the future?
The future of Estonian climate has been modeled several times since year 1996. Scenarios of the last climate prediction project will be shown and discussed.
We, 15.02.2017 at 15:00
Juhan Liivamägi. Properties and spatial distribution of galaxy superclusters
Galaxy superclusters are visually one of the most dominant features of the large-scale of the universe. They are massive concentrations of galaxies, contrasting to the seemingly empty regions beside them. Superclusters can extend from tens to over hundred megaparsecs, they contain from hundreds to thousands of galaxies, and many galaxy groups and clusters. Unlike galaxy clusters, superclusters are clearly unrelaxed systems, not gravitationally bound as crossing times exceed the age of the universe, and show little to no radial symmetry.
Remote sensing seminar