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1.
Searching for lensed supernovae behind galaxy clusters with upcoming telescopes
Tanja Petrushevska, published scientific conference contribution abstract

Abstract: Aims. Strong lensing by massive galaxy clusters can provide magnification of the flux and even multiple images of the galaxies that lie behind them. This phenomenon allows one to observe high-redshift supernovae (SNe), that otherwise would remain undetected. Type Ia supernovae (SNe Ia) detections are of particular interest because of their standard brightness, since they can be used to improve either cluster lensing models or cosmological parameter measurements. Methods. We present a ground-based, near-infrared search for lensed SNe behind the galaxy cluster Abell 370. Our survey was based on 15 epochs of J-band observations with the HAWK-I instrument on the Very Large Telescope (VLT). We use Hubble Space Telescope (HST) photometry to infer the global properties of the multiply-imaged galaxies. Using a recently published lensing model of Abell 370, we also present the predicted magnifications and the time-delays between the images. Results. In our survey, we did not discover any live SNe from the 13 lensed galaxies with 47 multiple images behind Abell 370. This is consistent with the expectation of 0.09 ± 0.02 SNe calculated based on the measured star formation rate. We compare the expectations of discovering strongly lensed SNe in our survey and that performed with HST during the Hubble Frontier Fields (HFF) program. We 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). We show that NIRCam instrument aboard the JWST will be sensitive to most SN multiple images in the strongly-lensed galaxies and thus able to measure their time-delays if observations are scheduled accordingly.
Found in: ključnih besedah
Summary of found: ...such as the James Webb Space Telescope ( JWST) or the Wide-Field Infrared Survey Telescope (WFIRST)....
Keywords: JWST, WFIRST, lensed supernovae, transient search
Published: 29.01.2018; Views: 2061; Downloads: 0
.pdf Fulltext (9,16 MB)

2.
Prospects for observing lensed supernovae behind galaxy clusters with JWST
Tanja Petrushevska, 2018, unpublished conference contribution

Abstract: Contributed talk at the international conference "The Universe as a telescope: probing the cosmos at all scales with strong lensing" in Milan 3-7 September 2018
Found in: ključnih besedah
Keywords: strong lensing, supernovae, JWST, LSST
Published: 12.09.2018; Views: 1751; Downloads: 0
.pdf Fulltext (48,18 KB)
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3.
Prospects for Strongly Lensed Supernovae Behind Hubble FrontierFields Galaxy Clusters with the James Webb Space Telescope
Tanja Petrushevska, 2018, original scientific article

Abstract: 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.
Found in: ključnih besedah
Summary of found: ...with the upcoming James Webb Space Telescope ( JWST). With four 1-hour visits inone year, the...
Keywords: supernovae, JWST, Hubble constant, strong lensing
Published: 03.01.2019; Views: 1789; Downloads: 0
.pdf Fulltext (278,75 KB)

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