Statistics – Computation
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...7e..42l&link_type=abstract
The Universe at z > 6, 26th meeting of the IAU, Joint Discussion 7, 17-18 August 2006, Prague, Czech Republic, JD07, #42
Statistics
Computation
Scientific paper
We present the first computation of the Cosmic Microwave Background (CMB) polarisation power spectrum from galaxy clusters and filaments using hydrodynamical simulations of large scale structure. We find that the contribution from warm ionised gas in filamentary structures dominates the polarised signal from galaxy clusters by more than one order of magnitude on large scales and by a factor of about two on small scales. On the other hand, the power spectrum of SZ temperature anisotropies associated with clusters from same simulation dominates that of filaments. It indicates that the careful study of the secondary polarisation provides complementary information to that we get from secondary temperature fluctuations especially from filaments. We study the dependence of the power spectra with sigma8. Assuming the power spectra vary like sigma_8^n we find n=3.2-4.0 for filaments and n=3.5-4.6 for clusters. This secondary polarisation does not prevent us from detecting gravitational wave induced polarisation at scales l < 100.
Aghanim Nabila
da Silva Arlindo
Liu Gaisheng
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