Detection likelihood of cluster-induced CMB polarization
  Nearby galaxy clusters can potentially induce sub-microkelvin polarization
signals in the cosmic microwave background (CMB) at characteristic scales of a
few arcminutes. We explore four such polarization signals induced in a rich
nearby fiducial cluster and calculate the likelihood of their detection by a
telescope project with capabilities such as those of the Simons Observatory
(SO). In our feasibility analysis, we include instrumental noise, primordial
CMB anisotropy, statistical thermal Sunyaev-Zeldovich (SZ) cluster signal, and
point source confusion, assuming a few percent of the nominal telescope
observation time of an SO-like project. Our analysis indicates that the thermal
SZ intensity can be sensitively mapped in rich nearby clusters and that the
kinematic SZ intensity can be measured with high statistical significance
toward a fast moving nearby cluster. The detection of polarized SZ signals will
be quite challenging but could still be feasible toward several very rich
nearby clusters with very high SZ intensity. The polarized SZ signal from a
sample of ~20 clusters can be statistically detected at S/N~3, if observed for
several months.
