http://arxiv.org/abs/1609.09730
We demonstrate that the CMB temperature-polarization cross-correlation provides accurate and robust constraints on cosmological parameters. We compare them with the results from temperature or polarization and investigate the impact of foregrounds, cosmic variance and instrumental noise. This analysis makes use of the Planck high-l HiLLiPOP likelihood based on angular power spectra that takes into account systematics from the instrument and foreground residuals directly modeled using Planck measurements. The temperature-polarization correlation (TE) spectrum is less contaminated by astrophysical emissions than the temperature power-spectrum (TT) allowing to derive constraints that are less sensitive to foreground uncertainties. For LCDM parameters, TE gives very competitive results compared to TT. For LCDM model extensions, it is limited by the instrumental noise level in the polarization maps.
F. Couchot, S. Henrot-Versille, O. Perdereau, et. al.
Mon, 3 Oct 16
22/47
Comments: 15 pages, 17 figures. Submitted to A&A
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