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Uncovering substructure with wavelets: proof of concept using Abell 2744

Schwinn, J.; Baugh, C.M.; Jauzac, M.; Bartelmann, M.; Eckert, D.

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Authors

J. Schwinn

M. Bartelmann

D. Eckert



Abstract

A recent comparison of the massive galaxy cluster Abell 2744 with the Millennium XXL (MXXL) N-body simulation has hinted at a tension between the observed substructure distribution and the predictions of Λ cold dark matter (ΛCDM). Follow-up investigations indicated that this could be due to the contribution from the host halo and the subhalo finding algorithm used. To be independent of any subhalo finding algorithm, we therefore investigate the particle data of the MXXL simulation directly. We propose a wavelet-based method to detect substructures in 2D mass maps, which treats the simulation and observations equally. Using the same criteria to define a subhalo in observations and simulated data, we find three Abell 2744 analogues in the MXXL simulation. Thus, the observations in Abell 2744 are in agreement with the predictions of ΛCDM. We investigate the reasons for the discrepancy between the results obtained from the SUBFIND and full particle data analyses. We find that this is due to incompatible substructure definitions in observations and SUBFIND.

Citation

Schwinn, J., Baugh, C., Jauzac, M., Bartelmann, M., & Eckert, D. (2018). Uncovering substructure with wavelets: proof of concept using Abell 2744. Monthly Notices of the Royal Astronomical Society, 481(4), 4300-4310. https://doi.org/10.1093/mnras/sty2566

Journal Article Type Article
Acceptance Date Sep 17, 2018
Online Publication Date Sep 20, 2018
Publication Date Dec 21, 2018
Deposit Date Oct 25, 2018
Publicly Available Date Mar 28, 2024
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 481
Issue 4
Pages 4300-4310
DOI https://doi.org/10.1093/mnras/sty2566

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.





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