Journal Article

Biases on the cosmological parameters and thermal Sunyaev–Zel'dovich residuals

Nicolas Taburet, Nabila Aghanim, Marian Douspis and Mathieu Langer

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 392, issue 3, pages 1153-1158
Published in print January 2009 | ISSN: 0035-8711
Published online January 2009 | e-ISSN: 1365-2966 | DOI:
Biases on the cosmological parameters and thermal Sunyaev–Zel'dovich residuals

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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 first develop an exact analytical expression for computing the biases on parameters when any additive signal is neglected in the analysis. We then apply it in the context of the forthcoming Planck experiment. For illustration, we investigate the effect of the sole residual thermal Sunyaev–Zel'dovich signal that remains after cluster extraction. We find, in particular, that analyses neglecting the presence of this contribution introduce on the cosmological parameters ns and τ biases, at least ∼6.5 and 2.9 times their 1σ confidence intervals. The Ωb parameter is also biased to a lesser extent.

Keywords: methods: statistical; galaxies: clusters: general; cosmic microwave background; cosmological parameters; cosmology: theory

Journal Article.  4521 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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