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Galaxies 2018, 6(2), 41; https://doi.org/10.3390/galaxies6020041

The Train Wreck Cluster Abell 520 and the Bullet Cluster 1E0657-558 in a Generalized Theory of Gravitation

1
Department of Physics, School of Natural and Applied Sciences, University of Technology, Jamaica, 237 Old Hope Road, Kingston 6, Jamaica
2
Perimeter Institute for Theoretical Physics, Waterloo, ON N2L 2Y5, Canada
3
Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada
*
Author to whom correspondence should be addressed.
Received: 19 January 2018 / Revised: 14 March 2018 / Accepted: 20 March 2018 / Published: 26 March 2018
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Abstract

A major hurdle for modified gravity theories is to explain the dynamics of galaxy clusters. A case is made for a generalized gravitational theory called Scalar-Tensor-Vector-Gravity (STVG) or MOG (Modified Gravity) to explain merging cluster dynamics. The paper presents the results of a re-analysis of the Bullet Cluster, as well as an analysis of the Train Wreck Cluster in the weak gravitational field limit without dark matter. The King- β model is used to fit the X-ray data of both clusters, and the κ -maps are computed using the parameters of this fit. The amount of galaxies in the clusters is estimated by subtracting the predicted κ -map from the κ -map data. The estimate for the Bullet Cluster is that 14.1 % of the cluster is composed of galaxies. For the Train Wreck Cluster, if the Jee et al. data are used, 25.7 % of the cluster is composed of galaxies. The baryon matter in the galaxies and the enhanced strength of gravitation in MOG shift the lensing peaks, making them offset from the gas. The work demonstrates that this generalized gravitational theory can explain merging cluster dynamics without dark matter. View Full-Text
Keywords: scalar tensor vector gravity; Bullet Cluster; Train Wreck Cluster scalar tensor vector gravity; Bullet Cluster; Train Wreck Cluster
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Israel, N.; Moffat, J. The Train Wreck Cluster Abell 520 and the Bullet Cluster 1E0657-558 in a Generalized Theory of Gravitation. Galaxies 2018, 6, 41.

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