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An excess of small-scale gravitational lenses observed in galaxy clusters

Journal
Date Issued
2020
Author(s)
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Davoli, Guido
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Natarajan, Priyamvada
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•
Caminha, Gabriel B.
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Metcalf, R. Benton
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Grillo, Claudio
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•
DOI
Abstract
Cold dark matter (CDM) constitutes most of the matter in the Universe. The interplay between dark and luminous matter in dense cosmic environments, such as galaxy clusters, is studied theoretically using cosmological simulations. Observations of gravitational lensing are used to characterize the properties of substructures—the small-scale distribution of dark matter—in clusters. We derive a metric, the probability of strong lensing events produced by dark-matter substructure, and compute it for 11 galaxy clusters. The observed cluster substructures are more efficient lenses than predicted by CDM simulations, by more than an order of magnitude. We suggest that systematic issues with simulations or incorrect assumptions about the properties of dark matter could explain our results.
Volume
369
Issue
6509
Start page
1347
Uri
Url
Issn Identifier
0036-8075
Ads BibCode
2020Sci...369.1347M
Rights
open.access
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