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Keywords: srbohrvaščina prozodija skladnja morfologija
Published in RUNG: 06.02.2018; Views: 3605; Downloads: 0
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Keywords: prevzete besede srbohrvaščina fonologija Leksikalni konzervatizem glasovne premene v sklanjatvi
Published in RUNG: 06.02.2018; Views: 3556; Downloads: 0
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Abstract: 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.
Keywords: lensed supernovae
Published in RUNG: 06.02.2018; Views: 2948; Downloads: 0
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Abstract: This summer, for two weeks, 120 high school students (out of 750 applicants) had the opportunity to taste how research is done at Stockholm University. The students worked in small groups under the supervision of doctoral students in chemistry, physics, biology and geology. At the Physics department, the two PhD students Tanja Petrushevska and Seméli Papadogiannakis offered a project that involved supernovae and their host galaxies.
Keywords: summer school for high school students in astrophysics
Published in RUNG: 06.02.2018; Views: 3107; Downloads: 0
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Abstract: I dagarna offentliggjordes att astrofysikerna på (iPTF) Intermediate Palomar Transient Factory detekterat en supernova typ 1a som vars ljus just nu böjs av en galax. Fenomenet kallas ”gravitational lensing” och är en effekt av att rumtiden kröks av massiva objekt, som vi diskuterade i Professor Magenta avsnitt om maskhål. Tanja Petrushevska är doktorand på Stockholms universitet och medlem av iPTF. Hon och de andra i iPTF skriver just nu på artikeln om upptäckten som hon berättar mer om i detta PM special!
Keywords: interview, astrophysics outreach
Published in RUNG: 06.02.2018; Views: 3236; Downloads: 0
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