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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

RXJ0437+00: Constraining Dark Matter with Exotic Gravitational Lenses

David J Lagattuta
  • Fonction : Auteur
Harald Ebeling
  • Fonction : Auteur
Catherine Cerny
  • Fonction : Auteur
Alastair Edge
  • Fonction : Auteur
Mathilde Jauzac
  • Fonction : Auteur
Guillaume Mahler
  • Fonction : Auteur
Richard Massey
  • Fonction : Auteur

Résumé

We present the first strong-gravitational-lensing analysis of the galaxy cluster RXJ0437.1+0043 (RXJ0437; z = 0.285). Newly obtained, deep MUSE observations, Keck/MOSFIRE near-infrared spectroscopy, and Hubble Space Telescope SNAPshot imaging reveal 13 multiply imaged background galaxies, three of them (at z=1.98, 2.97, and 6.02, respectively) in hyperbolic umbilic (H-U) lensing configurations. The H-U images are located only 20 -- 50 kpc from the cluster centre, i.e., at distances well inside the Einstein radius where images from other lens configurations are demagnified and often unobservable. Extremely rare (only one H-U lens was known previously) these systems are able to constrain the inner slope of the mass distribution -- and unlike radial arcs, the presence of H-U configurations is not biased towards shallow cores. The galaxies lensed by RXJ0437 are magnified by factors ranging from 30 to 300 and (in the case of H-U systems) stretched nearly isotropically. Taking advantage of this extreme magnification, we demonstrate how the source galaxies in H-U systems can be used to probe for small-scale ($\sim 10^{9} M_{\odot}$) substructures, providing additional insight into the nature of dark matter.
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hal-04076939 , version 1 (29-03-2024)

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David J Lagattuta, Johan Richard, Harald Ebeling, Quentin Basto, Catherine Cerny, et al.. RXJ0437+00: Constraining Dark Matter with Exotic Gravitational Lenses. Monthly Notices of the Royal Astronomical Society, 2023, 522 (1), pp.1091-1107. ⟨10.1093/mnras/stad803⟩. ⟨hal-04076939⟩
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