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Using the latest physical modeling and constrained by the most recent data,we develop a phenomenological parameterized model of the contributions tointensity and polarization maps at millimeter wavelengths from externalgalaxies and Sunyaev-Zeldovich effects. We find such modeling to be necessaryfor estimation of cosmological parameters from Planck data. For example,ignoring the clustering of the infrared background would result in a bias inn_s of 7 sigma. We show that the simultaneous marginalization over a fullforeground model can eliminate such biases, while increasing the statisticaluncertainty in cosmological parameters by less than 20%. The small increases inuncertainty can be significantly reduced with the inclusion ofhigher-resolution ground-based data.  The multi-frequency analysis we employ involves modeling 46 total powerspectra and marginalization over 17 foreground parameters. We show that we canalso reduce the data to a best estimate of the CMB power spectra, and just twoprincipal components (with constrained amplitudes) describing residualforeground contamination.

Modeling Extragalactic Foregrounds and Secondaries for Unbiased Estimation of Cosmological Parameters From Primary CMB Anisotropy