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We analyze the Southern Sky emission in linear polarization at 2.3 GHz asobserved by the S-band Polarization All Sky Survey S-PASS. Our purpose is tostudy the properties of the diffuse Galactic polarized synchrotron as acontaminant to CMB B-mode observations. We study the angular distribution ofthe S-PASS signal at intermediate and high Galactic latitudes by means ofangular power spectra. Power spectra, show a decay of the spectral amplitude asa function of multipole for \ell<200, typical of the diffuse emission. Spectracan be approximated by a power law C_{\ell}\propto\ell^{alpha}, with alpha~-3,and characterized by a B-to-E ratio of ~0.5. We study the synchrotron SED inpolarization by computing power spectra of the low frequency WMAP and Planckmaps. Results show that the SED, in the frequency range 2.3-33 GHz, iscompatible with a power law with beta_s=-3.22\pm0.08. Combining S-PASSpolarization maps with those coming from WMAP and Planck we derived a map ofthe synchrotron spectral index at angular resolution of 2{\deg} on about 30% ofthe sky. The recovered distribution peaks at the value around -3.2. We alsomeasure a significant spatial correlation between synchrotron and thermal dustsignals, as traced by the Planck 353 GHz channel. This correlation reachesabout 40% on the larger angular scales, decaying considerably at the degreescales. Finally, we use the S-PASS maps to assess the polarized synchrotroncontamination to CMB observations of the B-modes. Moreover, by combining S-PASSdata with Planck 353 GHz observations, we recover a map of the minimum level oftotal polarized foreground contamination to B-modes, finding that there is noregion of the sky, at any frequency, where this contamination lies belowequivalent tenor-to-scalar ratio ~10^-3. This result confirms the importance ofobserving both high and low frequency foregrounds in CMB B-mode measurements.

The S-PASS view of polarized Galactic Synchrotron at 2.3 GHz as a contaminant to CMB observations