T. Petrushevska (Author)

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.

Keywords

JWST;WFIRST;lensed supernovae;transient search;

Data

Language: English
Year of publishing:
Typology: 1.12 - Published Scientific Conference Contribution Abstract
Organization: UNG - University of Nova Gorica
UDC: 524
COBISS: 5025275 Link will open in a new window
Views: 2484
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Other data

URN: URN:SI:UNG
Type (COBISS): Not categorized
Pages: 1 str.
ID: 10901462
Recommended works:
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, lecture at the international conference "The Universe as a telescope: probing the cosmos at all scales with strong lensing", Milan 3-7 September 2018
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, poster contribution on The transient universe for all, Lund, 9th and 10th February 2015, Lundmarksalen, Lund Observatory