Predicting the CIB-$\phi$ contamination in the cross-correlation of the tSZ effect and $\phi$
In: 2015A&A...575L..11H; (2017)
Online
report
The recent release of {\it Planck} data gives access to a full sky coverage of the thermal Sunyaev-Zel'dovich (tSZ) effect and of the cosmic microwave background (CMB) lensing potential ($\phi$). The cross-correlation of these two probes of the large-scale structures in the Universe is a powerful tool for testing cosmological models, especially in the context of the difference between galaxy clusters and CMB for the best-fitting cosmological parameters. However, the tSZ effect maps are highly contaminated by cosmic infra-red background (CIB) fluctuations. Unlike other astrophysical components, the spatial distribution of CIB varies with frequency. Thus it cannot be completely removed from a tSZ Compton parameter map, which is constructed from a linear combination of multiple frequency maps. We have estimated the contamination of the CIB-$\phi$ correlation in the tSZ-$\phi$ power-spectrum. We considered linear combinations that reconstruct the tSZ Compton parameter from {\it Planck} frequency maps. We conclude that even in an optimistic case, the CIB-$\phi$ contamination is significant with respect to the tSZ-$\phi$ signal itself. Consequently, We stress that tSZ-$\phi$ analyses that are based on Compton parameter maps are highly limited by the bias produced by CIB-$\phi$ contamination.
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Predicting the CIB-$\phi$ contamination in the cross-correlation of the tSZ effect and $\phi$
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Autor/in / Beteiligte Person: | Hurier, G. |
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Quelle: | 2015A&A...575L..11H; (2017) |
Veröffentlichung: | 2017 |
Medientyp: | report |
DOI: | 10.1051/0004-6361/201525714 |
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