Stellar mass function of cluster galaxies at z $\sim$ 1.5: evidence for
  reduced quenching efficiency at high redshift
  We present the stellar mass functions (SMFs) of passive and star-forming
galaxies with a limiting mass of 10$^{10.1}$ M$_{\odot}$ in four
spectroscopically confirmed Spitzer Adaptation of the Red-sequence Cluster
Survey (SpARCS) galaxy clusters at 1.37 $<$ z $<$ 1.63. The clusters have 113
spectroscopically confirmed members combined, with 8-45 confirmed members each.
We construct $Ks$-band-selected photometric catalogs for each cluster with an
average of 11 photometric bands ranging from $u$ to 8 $\mu$m. We compare our
cluster galaxies to a field sample derived from a similar $Ks$-band-selected
catalog in the UltraVISTA/COSMOS field. The SMFs resemble those of the field,
but with signs of environmental quenching. We find that 30 $\pm$ 20\% of
galaxies that would normally be forming stars in the field are quenched in the
clusters. The environmental quenching efficiency shows little dependence on
projected cluster-centric distance out to $\sim$ 4 Mpc, providing tentative
evidence of pre-processing and/or galactic conformity in this redshift range.
We also compile the available data on environmental quenching efficiencies from
the literature, and find that the quenching efficiency in clusters and in
groups appears to decline with increasing redshift in a manner consistent with
previous results and expectations based on halo mass growth.
