The Bullet Cluster 1E0657-558 evidence shows modified gravity in the absence of dark matter

By J. Brownstein, J. W. Moffat. 2007

179 citations recorded by the source corpus.

A detailed analysis of the 2006 November 15 data release X-ray surface density Σ-map and the strong and weak gravitational lensing convergence K-map for the Bullet Cluster 1E0657-558 is performed and the results are compared with the predictions of a modified gravity (MOG) and dark matter. Our surface density Σ-model is computed using a King β-model density, and a mass profile of the main cluster and an isothermal temperature profile are determined by the MOG. We find that the main cluster thermal profile is nearly isothermal. The MOG prediction of the isothermal temperature of the main cluster is T = 15.5 ± 3.9keV, in good agreement with the experimental value T = 14.8 +2.0 -1.7 keV. Excellent fits to the 2D convergence K-map data are obtained without non-baryonic dark matter, accounting for the 8σ spatial offset between the Σ-map and the K-map reported in Clowe et al. The MOG prediction for the K-map results in two baryonic components distributed across the Bullet Cluster 1E0657-558 with averaged mass fraction of 83 per cent intracluster medium (ICM) gas and 17 per cent galaxies. Conversely, the Newtonian dark matter κ-model has on average 76 per cent dark matter (neglecting the indeterminant contribution due to the galaxies) and 24 per cent ICM gas for a baryon to dark matter mass fraction of 0.32, a statistically significant result when compared to the predicted A-cold dark matter cosmological baryon mass fraction of 0.176 +0.019 -0.012 .

Subfields: Astronomy and Astrophysics, Instrumentation, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/245b25b9f90502c77c44ad4c40338fa3605f2ed0

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In Astronomy and Astrophysics

1. Sohrab Rahvar
2. S. Allen
3. H. Ebeling
4. A. V. D. Linden
5. R. Morris
6. T. Treu
7. Richard J. Massey
8. J. W. Moffat

In Instrumentation

1. S. Allen
2. H. Ebeling
3. A. V. D. Linden
4. R. Morris
5. Sohrab Rahvar
6. T. Treu
7. Richard J. Massey
8. J. W. Moffat

In Nuclear and High Energy Physics

1. Sohrab Rahvar
2. J. W. Moffat
3. H. Ebeling
4. Richard J. Massey
5. R. Morris
6. S. Allen
7. A. V. D. Linden
8. T. Treu

Citations in the corpus

• Revealing the Properties of Dark Matter in the Merging Cluster MACS J0025.4–1222 (2008, methodology): “Models using the modified Newtonian Dynamics (MOND) theory (e.g. Milgrom 1983; Bekenstein 2004) have, however, so far achieved only limited success in reproducing the weak lensing observations (e.g. Angus et al. 2006; Brownstein & Moffat 2007) and are unable to explain the observed strong lensing.”
• The MOG weak field approximation and observational test of galaxy rotation curves (2013, methodology): “The same approach has also been applied to the dynamics of globular clusters (Moffat & Toth 2008), clusters of galaxies (Brownstein & Moffat 2006b) and the Bullet Cluster (Brownstein & Moffat 2007).”