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On building a cluster watch-list for identifying strongly lensed supernovae, gravitational waves and kilonovae.

Ryczanowski, Dan and Smith, Graham P. and Bianconi, Matteo and Massey, Richard and Robertston, Andrew and Jauzac, Mathilde (2020) 'On building a cluster watch-list for identifying strongly lensed supernovae, gravitational waves and kilonovae.', Monthly notices of the Royal Astronomical Society., 495 (2). pp. 1666-1671.

Abstract

Motivated by discovering strongly-lensed supernovae, gravitational waves, and kilonovae in the 2020s, we investigate whether to build a watch-list of clusters based on observed cluster properties (i.e. lens-plane selection) or on the detectability of strongly-lensed background galaxies (i.e. source-plane selection). First, we estimate the fraction of high-redshift transient progenitors that reside in galaxies that are themselves too faint to be detected as being strongly-lensed. We find ∼15 − 50 per cent of transient progenitors reside in z = 1 − 2 galaxies too faint to be detected in surveys that reach AB ≃ 23, such as the Dark Energy Survey. This falls to ≲10 per cent at depths that will be probed by early data releases of LSST (AB ≃ 25). Second, we estimate a conservative lower limit on the fraction of strong lensing clusters that will be missed by magnitude limited searches for multiply-imaged galaxies and giant arcs due to the faintness of such images. We find that DES-like surveys will miss ∼75 per cent of 1015M⊙ strong lensing clusters, rising to ∼100 per cent of 1014M⊙ clusters. Deeper surveys, such as LSST, will miss ∼40 per cent at 1015M⊙, and ∼95 per cent at 1014M⊙. Our results motivate building a cluster watch-list for strongly-lensed transients that includes those found by lens-plane selection.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/mnras/staa1274
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s) . Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:02 May 2020
Date deposited:11 May 2020
Date of first online publication:09 May 2020
Date first made open access:11 May 2020

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