Skip to main content

Research Repository

Advanced Search

What does strong gravitational lensing? The mass and redshift distribution of high-magnification lenses

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

What does strong gravitational lensing? The mass and redshift distribution of high-magnification lenses Thumbnail


Authors

Graham P. Smith

Richard Massey

Vincent Eke

Matteo Bianconi

Dan Ryczanowski



Abstract

Many distant objects can only be detected, or become more scientifically valuable, if they have been highly magnified by strong gravitational lensing. We use eagle and bahamas, two recent cosmological hydrodynamical simulations, to predict the probability distribution for both the lens mass and lens redshift when point sources are highly magnified by gravitational lensing. For sources at a redshift of two, we find the distribution of lens redshifts to be broad, peaking at z ≈ 0.6. The contribution of different lens masses is also fairly broad, with most high-magnification lensing due to lenses with halo masses between 1012 and 1014 M⊙. Lower mass haloes are inefficient lenses, while more massive haloes are rare. We find that a simple model in which all haloes have singular isothermal sphere density profiles can approximately reproduce the simulation predictions, although such a model over-predicts the importance of haloes with mass <1012 M⊙ for lensing. We also calculate the probability that point sources at different redshifts are strongly lensed. At low redshift, high magnifications are extremely unlikely. Each z = 0.5 source produces, on average, 5 ± 107 images with magnification greater than ten; for z = 2 this increases to about 2 ± 105. Our results imply that searches for strongly lensed optical transients, including the optical counterparts to strongly lensed gravitational waves, can be optimized by monitoring massive galaxies, groups and clusters rather than concentrating on an individual population of lenses.

Citation

Robertson, A., Smith, G. P., Massey, R., Eke, V., Jauzac, M., Bianconi, M., & Ryczanowski, D. (2020). What does strong gravitational lensing? The mass and redshift distribution of high-magnification lenses. Monthly Notices of the Royal Astronomical Society, 495(4), 3727-3739. https://doi.org/10.1093/mnras/staa1429

Journal Article Type Article
Acceptance Date May 19, 2020
Online Publication Date May 23, 2020
Publication Date Jul 31, 2020
Deposit Date May 26, 2020
Publicly Available Date Jun 9, 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 4
Pages 3727-3739
DOI https://doi.org/10.1093/mnras/staa1429

Files


Accepted Journal Article (902 Kb)
PDF

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.





You might also like



Downloadable Citations