The Massive and Distant Clusters of WISE Survey VII: The Environments
  and Properties of Radio Galaxies in Clusters at z~1
  We present the results from a study with NSF's Karl G. Jansky Very Large
Array (VLA) to determine the radio morphologies of extended radio sources and
the properties of their host galaxies in 50 massive galaxy clusters at z~1. We
find a majority of the radio morphologies to be Fanaroff-Riley (FR) type IIs.
By analyzing the infrared counterparts of the radio sources, we find that ~40%
of the host galaxies are the candidate brightest cluster galaxy (BCG) and ~83%
are consistent with being one of the top six most massive galaxies in the
cluster. We investigate the role of environmental factors on the radio-loud AGN
population by examining correlations between environmental and radio-galaxy
properties. We find that the highest stellar mass hosts ($M_{*} \gtrsim$
4$\times 10^{11} M_{\odot}$) are confined to the cluster center and host
compact jets. There is evidence for an increase in the size of the jets with
cluster-centric radius, which may be attributed to the decreased ICM pressure
confinement with increasing radius. Besides this correlation, there are no
other significant correlations between the properties of the radio-AGN
(luminosity, morphology, or size) and environmental properties (cluster
richness and location within the cluster). The fact that there are more AGN in
the cluster environment than the field at this epoch, combined with the lack of
strong correlation between galaxy and environmental properties, argues that the
cluster environment fosters radio activity but does not solely drive the
evolution of these sources at this redshift.
