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Although interesting in themselves, extragalactic sources emitting in themicrowave range (mainly radio-loud active galactic nuclei and dusty galaxies)are also considered a contaminant from the point of view of Cosmic MicrowaveBackground (CMB) experiments. These sources appear as unresolved point-likeobjects in CMB measurements because of the limited resolution of CMBexperiments. Amongst other issues, point-like sources are known to obstruct thereconstruction of the lensing potential, and can hinder the detection of thePrimordial Gravitational Wave Background for low values of $r$. Therefore,extragalactic point-source detection and subtraction is a fundamental part ofthe component separation process necessary to achieve some of the science goalsset for the next generation of CMB experiments. As a previous step to theirremoval, in this work we present a new filter based on steerable wavelets thatallows the characterization of the emission of these extragalactic sources.Instead of the usual approach of working in polarization maps of the Stokes'$Q$ and $U$ parameters, the proposed filter operates on E- and B-modepolarization maps. In this way, it benefits from the lower intensity that,both, the CMB, and the galactic foreground emission, present in B-modes toimprove its performance. To demonstrate its potential, we have applied thefilter to simulations of the future PICO satellite, and we predict that, forthe regions of fainter galactic foreground emission in the 30 GHz and 155 GHzbands of PICO, our filter will be able to characterize sources down to aminimum polarization intensity of, respectively, 125 pK and 14 pK. Adopting a$\Pi=0.02$ polarization degree, these values correspond to 169 mJy and 288 mJyintensities.

Characterization of Extragalactic Point-Sources on E- and B-mode Maps of the CMB Polarization