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

Ryczanowski, Dan; Smith, Graham P.; Bianconi, Matteo; Massey, Richard; Robertson, Andrew; Jauzac, Mathilde

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


Authors

Dan Ryczanowski

Graham P. Smith

Matteo Bianconi



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.

Citation

Ryczanowski, D., Smith, G. P., Bianconi, M., Massey, R., Robertson, A., & Jauzac, M. (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), 1666-1671. https://doi.org/10.1093/mnras/staa1274

Journal Article Type Article
Acceptance Date May 2, 2020
Online Publication Date May 9, 2020
Publication Date Jun 30, 2020
Deposit Date May 10, 2020
Publicly Available Date May 11, 2020
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 495
Issue 2
Pages 1666-1671
DOI https://doi.org/10.1093/mnras/staa1274

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Copyright 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.





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