Dark matter and Modified Newtonian Dynamics in a sample of high-redshift galaxy clusters observed with Chandra

TL;DR

This study compares gravitational mass measurements of 38 high-redshift galaxy clusters using MOND and Newtonian gravity, confirming MOND's inability to fully explain mass discrepancies but aligning baryon fractions with cosmological values.

Contribution

It provides the first systematic comparison of MOND and Newtonian gravity in high-redshift clusters, highlighting limitations of MOND in explaining mass discrepancies.

Findings

MOND cannot account for the mass difference in galaxy clusters.

Baryon fraction with MOND aligns with WMAP cosmological values.

Results reinforce the need for dark matter or alternative theories.

Abstract

We compare the measurement of the gravitational mass of 38 high-redshift galaxy clusters observed by Chandra using Modified Newtonian Dynamics (MOND) and standard Newtonian gravity. Our analysis confirms earlier findings that MOND cannot explain the difference between the baryonic mass and the total mass inferred from the assumption of hydrostatic equilibrium. We also find that the baryon fraction at $r_{2500}$ using MOND is consistent with the Wilkinson Microwave Anisotropy Probe (WMAP) value of $\Omega_{B}/\Omega_{M}$