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.
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.
|Full text:||(AM) Accepted Manuscript|
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|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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