The SZ effect : Biases introduced on cosmological parameter estimation using Planck

Details The SZ effect : Biases introduced on cosmological parameter estimation using Planck The SZ effect : Biases introduced on cosmological parameter estimation using Planck

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..351t&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

We examine the biases induced on cosmological parameters when the presence of secondary anisotropies is not taken into account in Cosmic Microwave Background analyses. We develop an exact analytical expression applicable when any additive signal (systematics, foregrounds) is neglected in the analysis. We then apply it, in the context of the upcoming Planck experiment, to the case of the thermal Sunyaev-Zel'dovich residual signal that remains after cluster extraction. We show that analyses neglecting the presence of this signal introduce important biases on the values of the cosmological parameters n_s and τ, at least 6.5 and 2.9 times larger than the expected precision on these parameters. The Ω_{b} parameter is also biased to a lesser extent.

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