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A full reconstruction of two galaxy clusters intra-cluster medium with strong gravitational lensing

Allingham, Joseph F V; Bœhm, Céline; Eckert, Dominique; Jauzac, Mathilde; Lagattuta, David; Mahler, Guillaume; Hilton, Matt; Lewis, Geraint F; Ettori, Stefano

A full reconstruction of two galaxy clusters intra-cluster medium with strong gravitational lensing Thumbnail


Authors

Joseph F V Allingham

Céline Bœhm

Dominique Eckert

Matt Hilton

Geraint F Lewis

Stefano Ettori



Abstract

Whilst X-rays and Sunyaev–Zel’dovich observations allow to study the properties of the intra-cluster medium (ICM) of galaxy clusters, their gravitational potential may be constrained using strong gravitational lensing. Although being physically related, these two components are often described with different physical models. Here, we present a unified technique to derive the ICM properties from strong lensing for clusters in hydrostatic equilibrium. In order to derive this model, we present a new universal and self-similar polytropic temperature profile, which we fit using the X-COP sample of clusters. We subsequently derive an analytical model for the electron density, which we apply to strong lensing clusters MACS J0242.5-2132 and MACS J0949.8+1708. We confront the inferred ICM reconstructions to XMM-Newton and ACT observations. We contrast our analytical electron density reconstructions with the best canonical β-model. The ICM reconstructions obtained prove to be compatible with observations. However they appear to be very sensitive to various dark matter halo parameters constrained through strong lensing (such as the core radius), and to the halo scale radius (fixed in the lensing optimizations). With respect to the important baryonic effects, we make the sensitivity on the scale radius of the reconstruction an asset, and use the inferred potential to constrain the dark matter density profile using ICM observations. The technique here developed should allow to take a new, and more holistic path to constrain the content of galaxy clusters.

Citation

Allingham, J. F. V., Bœhm, C., Eckert, D., Jauzac, M., Lagattuta, D., Mahler, G., …Ettori, S. (2024). A full reconstruction of two galaxy clusters intra-cluster medium with strong gravitational lensing. Monthly Notices of the Royal Astronomical Society, 528(2), 1711-1736. https://doi.org/10.1093/mnras/stae107

Journal Article Type Article
Acceptance Date Jan 8, 2024
Online Publication Date Jan 11, 2024
Publication Date 2024-02
Deposit Date Mar 21, 2024
Publicly Available Date Mar 21, 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 528
Issue 2
Pages 1711-1736
DOI https://doi.org/10.1093/mnras/stae107
Public URL https://durham-repository.worktribe.com/output/2335257

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