Characterization of the polarized synchrotron emission from Planck and WMAP data

Abstract The purpose of this work is to characterize the diffuse Galactic polarized synchrotron, which dominant CMB foreground emission at low frequency. We present EE, BB, and EB power spectra estimated from polarization frequency maps 23 30 GHz as observed respectively by WMAP K-band Planck lowest channel, for a set six sky regions covering 30% 94% sky. study synchrotron angular distribution spectral energy (SED) means so-called pseudo- C ? formalism, provided NaMaster package, in multipole interval ? 300. Best results are obtained cross-correlating data. EE BB show steep decay amplitude function multipole, approximated law EE,BB ? ? , with = -2.95 ± 0.04 -2.85 0.14. B/E asymmetry proved B-to-E ratio, computed ratio pivot 80, 0.22 0.02. cross-component compatible zero 1 ? an upper constraint on EB/EE 1.2% 2 level. that power-law model null cross-correlation describes reasonably well full if bright center point sources masked. recovered SED shows indices ? -3.00 0.10 -3.05 0.36 between themselves, range 23–30 GHz. Results also seem indicate gets steeper high latitude.