Hydrostatic Equilibrium Constraints in X-COP Galaxy Clusters: Testing Hyperconical Modified Gravity in Hot-gas-dominated Regions

• DOI: 10.3847/1538-4357/adb723
• Publication Date: 2025-03-11T06:15:01Z
• Authors: Robert Monjo
• Keywords: Hydrostatic equilibrium

Abstract Modified Newtonian dynamics (MOND) was originally proposed to model galaxy rotation curves without dark matter. However, MOND presents difficulties in explaining the radial acceleration relation observed clusters, and moreover, it does not completely eliminate need for matter, since requires using nonluminous particles (e.g., cold molecular gas or dust, neutrinos) explain hydrostatic equilibrium of hot gas. Hyperconical modified gravity (HMG) offers a relativistic framework that recovers success as natural particular case, could potentially reconcile previously described discrepancies invoking any type This paper analyzes performance HMG 12 XMM Cluster Outskirts Project with special focus on 5 objects available complete stellar mass information: A1795, A2029, A2142, A2319, A644. Specifically, we used high-resolution X-ray data which density profiles were derived constrain models. Our results show analyzed cluster is more naturally adjusted beyond 1 Mpc, reducing fit parameters, but further research required expand spatial scales.