The angular power spectra of polarized Galactic synchrotron

Abstract We derive the angular power spectra of intensity and polarization of Galactic synchrotron emission in the range 36≤l≲10 3 from the Parkes survey mapping the southern Galactic plane at 2.4 GHz. The polarization spectra of both electric and magnetic parity up to l≃10 3 are approximated very well by power laws with slope coefficients ≃1.4, quite different from the CMB spectra. We show that no problem should arise from Galactic synchrotron for measurements of CMB polarization in the cosmological window.