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1.
Prospects for lensed supernovae behind galaxy clusters with the James Webb Space Telescope
Tanja Petrushevska, 2018, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: 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).
Najdeno v: ključnih besedah
Povzetek najdenega: ...Strong lensing, Hubble constant, measuring expansion history with time delays,...
Ključne besede: Strong lensing, Hubble constant, measuring expansion history with time delays, lensed supernovae
Objavljeno: 09.07.2018; Ogledov: 416; Prenosov: 28
.pdf Polno besedilo (4,14 MB)

2.
Prospects for Strongly Lensed Supernovae Behind Hubble FrontierFields Galaxy Clusters with the James Webb Space Telescope
Tanja Petrushevska, 2018, izvirni znanstveni članek

Opis: Measuring time delays from strongly lensed supernovae (SNe) is emerging as a novel andindependent tool for estimating the Hubble constant (H0). This is very important given the recent discordin the value of H0) from two methods that probe different distance ranges. The success of this techniquewill rely of our ability to discover strongly lensed SNe with measurable time delays. Here, we present themagnifications and the time delay s for the multiply-imaged galaxies behind the Hubble Frontier Fields(HFF) galaxy clusters, by using recently published lensing models. Continuing on our previous work donefor Abell 1689 (A1689) and Abell 370, we also show the prospects of observing strongly lensed SNe behindthe HFF clusters with the upcoming James Webb Space Telescope (JWST). With four 1-hour visits inone year, the summed expectations of all six HFF clusters are ∼0 .5 core-collapse (CC) SNe and 0.06Type Ia SNe (SNe Ia) in F115W band, while with F150W the expectations are higher, ∼0.9 CC SNeand ∼0.06 SNe Ia. These estimates match those expected by only surveying A1689, proving that theperformance of A1689 as gravitational telescope is superior. In the five HFF clusters presented here, wefind that F150W will be able to detect SNe Ia (SNe IIP) exploding in 93 (80) pairs multiply-imaged galaxieswith time delays of less than 5 years.
Najdeno v: ključnih besedah
Povzetek najdenega: ...novel andindependent tool for estimating the Hubble constant (H0). This is very important given the...
Ključne besede: supernovae, JWST, Hubble constant, strong lensing
Objavljeno: 03.01.2019; Ogledov: 85; Prenosov: 0
.pdf Polno besedilo (278,75 KB)

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