Is there a fundamental acceleration scale in galaxies?
  Milgrom's modified Newtonian dynamics (MOND) can explain well the mass
discrepancy problem in galaxy without invoking dark matter. The MOND theory
predicts a universal constant acceleration scale in galaxy, below which the
Newtonian dynamics is no longer valid. Recently, Rodrigues et al. analyzed 193
high-quality disk galaxies by using Bayesian inference and they concluded that
the probability of existence of a fundamental acceleration scale is essentially
0. In this paper, we use the same method to revisit the same question: Is there
a fundamental acceleration scale in galaxies? We fit each galaxy rotation curve
of 175 SPARC galaxies with Gaussian priors on galaxy parameters and a variable
acceleration scale. After marginalizing over the nuisance parameters, we find
that the marginalized posterior distributions of the acceleration scale become
broad. The incompatibility between the global best fit and the marginalized
posterior distributions of the acceleration scale is greatly reduced. However,
there still exists evidence that rejects MOND as a fundamental theory. More
accurate observations are needed to exclude or confirm the existence of a
fundamental acceleration scale in galaxies.
