T. Petrushevska (Avtor)

Povzetek

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. I will also show the expectations of search campaigns that can be conducted with future facilities, such as the James Webb Space Telescope (JWST) or the Wide-Field Infrared Survey Telescope (WFIRST).

Ključne besede

strong lensing;Hubble constant;measuring expansion history;time delays;lensed supernovae;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.12 - Objavljeni povzetek znanstvenega prispevka na konferenci
Organizacija: UNG - Univerza v Novi Gorici
UDK: 52
COBISS: 5174011 Povezava se bo odprla v novem oknu
Št. ogledov: 2873
Št. prenosov: 136
Ocena: 0 (0 glasov)
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Ostali podatki

URN: URN:SI:UNG
Vrsta dela (COBISS): Delo ni kategorizirano
ID: 10944181
Priporočena dela:
, lecture at the international conference "The Universe as a telescope: probing the cosmos at all scales with strong lensing", Milan 3-7 September 2018
, ni podatka o podnaslovu