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Tanja Petrushevska: Supernovae seen through gravitational telescopes

Date: 21. 4. 2017
Source: Astrodebate
Tanja Petrusevska, doktorska študentka na Univerzi v Stockholmu, bo predstavila opazovanja gravitacijsko lečene supernove tipa Ia. Predavanje bo v sredo, 26. aprila, ob 12. uri v predavalnici F4 na Jadranski 19. Vljudno vabljeni!
Supernovae seen through gravitational telescopes 
Tanja Petrushevska
Department of Physics, Faculty of Science, Stockholm University
The Oskar Klein Centre for Cosmo Particle Physics, Sweden 


Galaxies, and clusters of galaxies, can act as gravitational lenses and magnify the light of objects behind them. The effect enables observations of very distant supernovae, that otherwise would be too faint to be detected by existing telescopes, and allows studies of the frequency and properties of these rare phenomena when the universe was young. Under the right circumstances, multiple images of the lensed supernovae can be observed, and due to the variable nature of the objects, the difference between the arrival times of the images can be measured. Since the images have taken different paths through space before reaching us, the time-differences are sensitive to the expansion rate of the universe. One class of supernovae, Type Ia, are of particular interest to detect. Their well known brightness can be used to determine the magnification, which can be used to understand the lensing systems. I will also report our discovery of the first resolved multiply-imaged gravitationally lensed supernova Type Ia.


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