Testing Emergent Gravity with Optical, X-ray, and Weak Lensing
  Measurements in Massive, Relaxed Galaxy Clusters
  We test the predictions of Emergent Gravity using matter densities of
relaxed, massive clusters of galaxies using observations from optical and X-ray
wavebands. We improve upon previous work in this area by including the baryon
mass contribution of the brightest cluster galaxy in each system, in addition
to total mass profiles from gravitational lensing and mass profiles of the
X-ray emitting gas from Chandra. We use this data in the context of Emergent
Gravity to predict the "apparent" dark matter distribution from the observed
baryon distribution, and vice-versa. We find that although the inclusion of the
brightest cluster galaxy in the analysis improves the agreement with
observations in the inner regions of the clusters ($r \lesssim 10-30$ kpc), at
larger radii ($r \sim 100-200$ kpc) the Emergent Gravity predictions for mass
profiles and baryon mass fractions are discrepant with observations by a factor
of up to $\sim2-6$, though the agreement improves at radii near $r_{500}$. At
least in its current form, Emergent Gravity does not appear to reproduce the
observed characteristics of relaxed galaxy clusters as well as cold dark matter
models.
