The intracluster light as an estimator of the cluster mass profile

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Main Authors:	Asensio, Isaac Alonso, Contreras-Santos, Ana
Format:	Preprint
Published:	2025
Subjects:	Astrophysics of Galaxies
Online Access:	Acceder al recurso
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author	Asensio, Isaac Alonso Contreras-Santos, Ana
author_facet	Asensio, Isaac Alonso Contreras-Santos, Ana
contents	Context. The intracluster light (ICL) comprises stars that are not bound to individual galaxies within a galaxy cluster, and it provides insights into the cluster mass distribution, evolutionary history, and dynamical state. Aims. We study the viability of the intracluster stellar mass as a proxy for computing the total mass profiles of galaxy clusters. Methods. High-resolution simulations from the C-EAGLE project were used to study the ratio of the intracluster stellar mass and total matter projected densities. This ratio follows a power law, and we present a model for its fit parameters and associated errors. Results. We used this relation to estimate the mass profile of the Perseus cluster based on Euclid observations that extend up to one-third of the virial radius. The obtained cluster mass is compatible with other measurements from galaxy velocity dispersion, but it is overestimated by a factor of two compared to X-ray mass estimates. We repeated this process for four clusters in the Hubble Frontier Fields, finding compatibility with weak- and strong-lensing mass estimates. Conclusions. This method provides an independent approach to cluster mass estimation that is based solely on the observed ICL and a simulation-calibrated relation.
format	Preprint
id	arxiv_https___arxiv_org_abs_2507_05404
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	The intracluster light as an estimator of the cluster mass profile Asensio, Isaac Alonso Contreras-Santos, Ana Astrophysics of Galaxies Context. The intracluster light (ICL) comprises stars that are not bound to individual galaxies within a galaxy cluster, and it provides insights into the cluster mass distribution, evolutionary history, and dynamical state. Aims. We study the viability of the intracluster stellar mass as a proxy for computing the total mass profiles of galaxy clusters. Methods. High-resolution simulations from the C-EAGLE project were used to study the ratio of the intracluster stellar mass and total matter projected densities. This ratio follows a power law, and we present a model for its fit parameters and associated errors. Results. We used this relation to estimate the mass profile of the Perseus cluster based on Euclid observations that extend up to one-third of the virial radius. The obtained cluster mass is compatible with other measurements from galaxy velocity dispersion, but it is overestimated by a factor of two compared to X-ray mass estimates. We repeated this process for four clusters in the Hubble Frontier Fields, finding compatibility with weak- and strong-lensing mass estimates. Conclusions. This method provides an independent approach to cluster mass estimation that is based solely on the observed ICL and a simulation-calibrated relation.
title	The intracluster light as an estimator of the cluster mass profile
topic	Astrophysics of Galaxies
url	https://arxiv.org/abs/2507.05404

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