Sunyaev-Zel'dovich contribution in CMB analysis
arXiv:0908.1653 · doi:10.1111/j.1365-2966.2010.16372.x
Abstract
The Sunyaev-Zel'dovich (SZ) effect has long been identified as one of the most important secondary effects of the Cosmic Microwave Background (CMB). On the one hand, it is a potentially very powerful cosmological probe providing us with additional constraints and on the other hand it represents the major source of secondary fluctuations at small angular scales (l > 1000). We investigate the effects of the SZ modelling in the determination of the cosmological parameters. We explore the consequences of the SZ power spectrum computation by comparing three increasingly complex modelling, from a fixed template with an amplitude factor to a calculation including the full cosmological parameter dependency. We also examine the dependency of the cosmological parameter estimation on the intra-cluster gas description used to calculate the SZ spectrum. We show that methods assuming an SZ template bias the cosmological parameters (by up to 2 sigmas on sigma_8) when the cosmology used in the template deviates from the reference one. A joint CMB-SZ analysis with a full cosmological dependency of the SZ spectrum does not suffer from such biases and moreover improves the confidence intervals of sigma_8 and Omega_{dm}h^2 (2.5 and 2 times respectively) with respect to a pure CMB analysis. However, the latter method is quite sensitive to the intra-cluster gas parameters and hence requires extra information on the clusters to alleviate the induced biases.
7 pages, 6 figures submitted to MNRAS, revised version
References in corpus (13)
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
- Precision Determination of the Mass Function of Dark Matter Halos
- High resolution CMB power spectrum from the complete ACBAR data set
- The imprints of local superclusters on the Sunyaev-Zel'dovich signals and their detectability with Planck
- Observations of High-Redshift X-Ray Selected Clusters with the Sunyaev-Zel'dovich Array
- Improved Measurements of the CMB Power Spectrum with ACBAR
- Final Results from the BIMA CMB Anisotropy Survey and Search for Signature of the SZ effect
- Biases on the cosmological parameters and thermal SZ residuals
- The probability distribution function of the SZ power spectrum: an analytical approach
- Primordial quadrupole-induced polarisation from filamentary structures and galaxy clusters
- Small scale contributions to CMB: A coherent analysis