Speaker
Description
Galaxy cluster scaling relations are fundamental for understanding cluster physics and testing ΛCDM, but their use in cosmology is still limited by large uncertainties. Many studies rely on hydrostatic equilibrium, despite numerous out-of-equilibrium systems, and the classification of cluster dynamical states remains incomplete, particularly for intermediate evolutionary stages. Even gravitational lensing, the only mass measurement independent of equilibrium assumptions, is affected by projection effects, especially in unrelaxed clusters.
We present a new approach based on dark matter-gas coherence, which quantifies how well the intracluster gas traces the mass distribution. We tested this method on simulated clusters (IllustrisTNG300), demonstrating a strong correlation between coherence and scatter in scaling relations, offering a way to improve cosmological constraints. Additionally, we applied the method to a small sample of observed clusters, showing its feasibility for real data.
By addressing both hydrostatic equilibrium biases and weak lensing projection effects, this method provides a powerful tool to classify cluster dynamical states more systematically and reduce systematic uncertainties in cluster-based cosmology.
| Would you be interested in presenting a poster if the conference is oversubcribed? | Yes |
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