On the residual missing mass of the Bullet Cluster

TL;DR

This paper confirms that the Bullet Cluster exhibits a residual missing mass discrepancy in the context of Modified Newtonian Dynamics, similar to other galaxy clusters, and suggests this missing mass is collisionless and centered on galaxies.

Contribution

The study verifies the residual missing mass in the Bullet Cluster within MOND using updated gravitational lens data, highlighting its collisionless nature.

Findings

Bullet Cluster shows residual missing mass in MOND

Missing mass is centered on galaxies

Discrepancy similar to other clusters

Abstract

Modified Newtonian Dynamics (MOND) is a paradigm that can do away with dark matter at galaxy scales, but displays a residual missing mass discrepancy in galaxy clusters. Prompted by the updated JWST-based gravitational lens model of the Bullet Cluster, I confirm here that this cluster exhibits the same residual missing mass discrepancy as other clusters of similar mass in the MOND context. Moreover, this missing mass should be mostly collisionless, since it is centred on the galaxies of the Bullet Cluster.