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The distribution of dark matter and gas spanning six megaparsecs around the post-merger galaxy cluster MS0451-03

Tam, S-L; Jauzac, M; Massey, R; Harvey, D; Eckert, D; Ebeling, H; Ellis, R; ... Smith, GP; + view all (2020) The distribution of dark matter and gas spanning six megaparsecs around the post-merger galaxy cluster MS0451-03. Monthly Notices of the Royal Astronomical Society , 496 (3) pp. 4032-4050. 10.1093/mnras/staa1828. Green open access

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Abstract

Using the largest mosaic of Hubble Space Telescope images around a galaxy cluster, we map the distribution of dark matter throughout an ∼6 × 6 Mpc2 area centred on the cluster MS 0451−03 (z = 0.54, M200=1.65×1015M⊙⁠). Our joint strong- and weak-lensing analysis shows three possible filaments extending from the cluster, encompassing six group-scale substructures. The dark matter distribution in the cluster core is elongated, consists of two distinct components, and is characterized by a concentration parameter of c200 = 3.79 ± 0.36. By contrast, XMM–Newton observations show the gas distribution to be more spherical, with excess entropy near the core, and a lower concentration of c200=2.35+0.89−0.70 (assuming hydrostatic equilibrium). Such a configuration is predicted in simulations of major mergers 2–7 Gyr after the first core passage, when the two dark matter haloes approach second turnaround, and before their gas has relaxed. This post-merger scenario finds further support in optical spectroscopy of the cluster’s member galaxies, which shows that star formation was abruptly quenched 5 Gyr ago. MS 0451−03 will be an ideal target for future studies of the growth of structure along filaments, star formation processes after a major merger, and the late-stage evolution of cluster collisions.

Type: Article
Title: The distribution of dark matter and gas spanning six megaparsecs around the post-merger galaxy cluster MS0451-03
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/staa1828
Publisher version: https://doi.org/10.1093/mnras/staa1828
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10102500
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