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Joint cluster reconstructions - combing free-form lensing and X-rays

Galaxy clusters provide a multitude of observational data across wavelengths, and their structure and morphology are of considerable interest in cosmology as well as astrophysics.<i>Aims<i/>. We develop a framework that allows the combination of lensing and non-lensing observations in a...

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Main Authors: Huber, Korbinian (Author) , Tchernin, Céline (Author) , Merten, Julian (Author) , Hilbert, Stefan (Author) , Bartelmann, Matthias (Author)
Format: Article (Journal)
Language:English
Published: 15 July 2019
In: Astronomy and astrophysics
Year: 2019, Volume: 627
ISSN:1432-0746
DOI:10.1051/0004-6361/201834928
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/201834928
Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2019/07/aa34928-18/aa34928-18.html
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Author Notes:Korbinian Huber, Céline Tchernin, Julian Merten, Stefan Hilbert, and Matthias Bartelmann

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520 |a Galaxy clusters provide a multitude of observational data across wavelengths, and their structure and morphology are of considerable interest in cosmology as well as astrophysics.<i>Aims<i/>. We develop a framework that allows the combination of lensing and non-lensing observations in a free-form and mesh-free approach to infer the projected mass distribution of individual galaxy clusters. This method can be used to test common assumptions on the morphology of clusters in parametric models.<i>Methods<i/>. We make use of the lensing reconstruction code SAWLENS2, and expand its capabilities by incorporating an estimate of the projected gravitational potential based on X-ray data that are deprojected using the local Richardson-Lucy method and used to infer the Newtonian potential of the cluster. We discuss how potentially arising numerical artefacts can be treated.<i>Results<i/>. We demonstrate the feasibility of our method on a simplified mock Navarro-Frenk-White (NFW) halo and on a cluster from a realistic hydrodynamical simulation. We show how the combination of X-ray and weak lensing data can affect a free-form reconstruction, improving the accuracy in the central region in some cases by a factor of two. 
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