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Article Dans Une Revue The Astrophysical Journal Année : 2007

Discovery of a Ringlike Dark Matter Structure in the Core of the Galaxy Cluster Cl 0024 17

Résumé

We present a comprehensive mass reconstruction of the rich galaxy cluster Cl 0024 17 at z~=0.4 from ACS data, unifying both strong- and weak-lensing constraints. The weak-lensing signal from a dense distribution of background galaxies (~120 arcmin-2) across the cluster enables the derivation of a high-resolution parameter-free mass map. The strongly lensed objects tightly constrain the mass structure of the cluster inner region on an absolute scale, breaking the mass-sheet degeneracy. The mass reconstruction of Cl 0024 17 obtained in such a way is remarkable. It reveals a ringlike dark matter substructure at r~75'' surrounding a soft, dense core at r

Dates et versions

hal-03742972 , version 1 (02-08-2022)

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Citer

Myungkook J. Jee, Holland C. Ford, Garth D. Illingworth, Richard L. White, T. J. Broadhurst, et al.. Discovery of a Ringlike Dark Matter Structure in the Core of the Galaxy Cluster Cl 0024 17. The Astrophysical Journal, 2007, 661, pp.728-749. ⟨10.1086/517498⟩. ⟨hal-03742972⟩
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