Planck 2015 results
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Fig. 30


Left: cartographic projection of the combined Planck-WMAP polarization amplitude, centred at the Galactic centre, with graticule lines at 15deg intervals. The regions defined by red and yellow dashed lines were selected to calculate a polarized spectral index; in red is the filament around the Fermi bubble and in yellow a control area. Centre: cartographic projection of the 10–500 GeV map from Ackermann et al. (2014), with the π0 emission subtracted as described in the text, showing the Fermi bubbles. Right: Fermi bubbles component from Selig et al. (2015). The black outline corresponds to the centre of the narrow filaments visible in the polarization map on the left.

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