Statistical properties of polarized CMB foreground maps
  Foreground removal techniques for CMB analyses make specific assumptions
about the properties of foregrounds in temperature and in polarization. By
investigating the statistics of foreground components more understanding about
the degree to which these assumptions are valid can be obtained. In this work
we investigate $E$- and $B$-mode maps of the two strongest polarized
foregrounds, synchrotron and thermal dust emission, with regards to their
similarity with Gaussian processes, their spectral variations and
cross-correlations. We perform tests in patches of $\sim3.7^\circ$ size
collectively covering the full sky and find most of them to conform with their
Gaussian expectation according to the statistics in use. Correlations exhibit
distinct differences in $E$- and $B$-mode signals which point towards
necessities in foreground removal methods. We discuss potential consequences
and possible further directions.
