For refcode 2014MNRAS.441.3724M: Retrieve 11 NED objects in this reference. Please click here for ADS abstract
NED Abstract
Copyright by Royal Astronomical Society.
2014MNRAS.441.3724M
The MOG weak field approximation  II. Observational test of Chandra Xray
clusters
Moffat, J. W.; Rahvar, S.
Abstract. We apply the weak field approximation limit of the covariant
scalartensorvector gravity theory, socalled MOdified gravity (MOG), to
the dynamics of clusters of galaxies by using only baryonic matter. The
MOG effective gravitational potential in the weak field approximation is
composed of an attractive Newtonian term and a repulsive Yukawa term with
two parameters {alpha} and mu. The numerical values of these parameters
have been obtained by fitting the predicted rotation curves of galaxies to
observational data, yielding the bestfitting result: {alpha} = 8.89 +/
0.34 and mu = 0.042 +/ 0.004 kpc^1^. We extend the observational test of
this theory to clusters of galaxies, using data for the ionized gas and
the temperature profile of nearby clusters obtained by the Chandra Xray
telescope. Using the MOG virial theorem for clusters, we compare the mass
profiles of clusters from observation and theory for 11 clusters. The
theoretical mass profiles for the inner parts of clusters exceed the
observational data. However, the observational data for the inner parts of
clusters (i.e. r < 0.1r_500_) is scattered, but at distances larger than
~300 kpc, the observed and predicted mass profiles converge. Our results
indicate that MOG as a theory of modified gravity is compatible with the
observational data from the Solar system to megaparsec scales without
invoking dark matter.
Key words: gravitation, galaxies: clusters: general, galaxies: kinematics
and dynamics, Xrays: galaxies: clusters
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