Planck data revisited: Low-noise synchrotron polarization maps from the WMAP and Planck space missions

Open Access

Fig. 8

Synchrotron and noise polarized intensity obtained in this work. Top: total polarized intensity, $P = \sqrt{Q^{2} + U^{2}}$ $\[P=\sqrt{Q^2+U^2}\]$ , of the synchrotron map. Middle: noise contribution, computed from 200 noise simulations. Increased map depth is visible both in regions of low Planck HFI noise near the ecliptic poles, and along the deeper integration rings of the WMAP scanning. Bottom: synchrotron polarized intensity after debiasing from the noise contribution. In the cleanest sky regions, pixels where $(Q^{2} + U^{2}) - (σ_{Q}^{2} + σ_{U}^{2})$ $\[\left(Q^2+U^2\right)-\left(\sigma_Q^2+\sigma_U^2\right)\]$ is negative appear in gray.

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