Issue |
A&A
Volume 696, April 2025
|
|
---|---|---|
Article Number | A227 | |
Number of page(s) | 10 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361/202553989 | |
Published online | 25 April 2025 |
Self-similarity of the mass distribution in rich galaxy clusters up to z∼1 tracked with weak lensing
1
INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, I-40129 Bologna, Italy
2
INFN, Sezione di Bologna, viale Berti Pichat 6/2, I-40127 Bologna, Italy
⋆ Corresponding author: mauro.sereno@inaf.it
Received:
31
January
2025
Accepted:
18
March
2025
In the standard theory of growth of nonbaryonic dark matter, cosmic structures form hierarchically and self-similarly from smaller clumps. The assembly merger tree extends from the linear perturbations in the early Universe to highly non-linear structures at late times. Gravity is the driving force, and self-similarity should inform cosmic haloes. However, it is unclear whether the apparent anomalies at non-linear scales are due to baryonic or new physics. I show that the mass distribution of rich haloes evolved self-similarly at least since the Universe was 5.7 Gyr old. Using gravitational weak lensing, I constrained the mass profiles of galaxy clusters with M200c ≳ 2 × 1014 M⊙ that were optically detected in the HSC-SSP survey in the redshift range 0.2 ≤ z < 1.0. The cluster self-similarity confirms the standard theory of growth in the non-linear regime. Clusters are still growing, but neither violent mergers nor matter slowly falling in from the cosmic web disrupt the self-similarity, which is in place well before the halo formation time. Dark matter growth can fit the fossil cosmic microwave background as well as young, very massive haloes. Next-generation survey searches at scales in clusters in which self-similarity breaks might pose a new challenge to dark matter.
Key words: gravitational lensing: weak / galaxies: clusters: general / cosmology: observations / dark matter
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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