Galaxy cluster masses without non-baryonic dark matter

By J. Brownstein, J. W. Moffat. 2005

136 citations recorded by the source corpus.

We apply the modified acceleration law obtained from Einstein gravity coupled to a massive skew symmetric field, Fμνλ, to the problem of explaining X-ray galaxy cluster masses without exotic dark matter. Utilizing X-ray observations to fit the gas mass profile and temperature profile of the hot intracluster medium (ICM) with King ‘β-models’, we show that the dynamical masses of the galaxy clusters resulting from our modified acceleration law fit the cluster gas masses for our sample of 106 clusters without the need of introducing a non-baryonic dark matter component. We are further able to show for our sample of 106 clusters that the distribution of gas in the ICM as a function of radial distance is well fitted by the dynamical mass distribution arising from our modified acceleration law without any additional dark matter component. In a previous work, we applied this theory to galaxy rotation curves and demonstrated good fits to our sample of 101 low surface brightness, high surface brightness and dwarf galaxies including 58 galaxies that were fitted photometrically with the singleparameter mass-to-light ratio (M/L)stars. The results obtained there were qualitatively similar to those obtained using Milgrom’s phenomenological Modified Newtonian Dynamics (MOND) model, although the determined galaxy masses were quantitatively different, and MOND does not show a return to Keplerian behaviour at extragalactic distances. The results obtained here are compared to those obtained using Milgrom’s phenomenological MOND model which does not fit the X-ray galaxy cluster masses unless an auxiliary dark matter component is included.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/972bb88ded24b95d52ce4b3060d6b46e509e17e6

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Citations in the corpus

A Direct Empirical Proof of the Existence of Dark Matter (2006, background): “Proposed solutions either invoke dominant quantities of non-luminous “dark matter” (Oort 1932) or alterations to either the gravitational force law (Bekenstein 2004; Brownstein & Moffat 2006) or the particles’ dynamical response to it (Milgrom 1983).”
The MOG weak field approximation and observational test of galaxy rotation curves (2013, methodology): “The predictions of MOG for the rotation curves of galaxies have been compared to the data (Brownstein & Moffat 2006a; Brownstein 2009 ), using a static spherically symmetric point mass solution derived from the field equations.”
Evolution of cosmological perturbations in Bose–Einstein condensate dark matter (2011, background): “…theoretical models to explain the galactic rotation curves have also been elaborated recently (Milgrom 1983; Mannheim 1993; Bekenstein 2004; Mak & Harko 2004; Brownstein & Moffat 2006; Harko & Cheng 2006; Bertolami et al. 2007; Boehmer & Harko 2007; Boehmer et al. 2008a,b; Capozziello et al. 2009).”
The Bullet Cluster 1E0657-558 evidence shows modified gravity in the absence of dark matter (2007, methodology): “…running of the MOG mass scale, M0, depending on the computed total cluster mass, Mgas, according to the large (> 100) galaxy cluster survey of Brownstein and Moffat (2006a) for the main and subcluster (shown graphically in Figure 6), and the overall best-fit to the κ-map; and the results for…”