Microwave sky and the local Rees-Sciama effect

Details Microwave sky and the local Rees-Sciama effect Microwave sky and the local Rees-Sciama effect

2006-01-19

arxiv.org/abs/astro-ph/0601445v3

Mon.Not.Roy.Astron.Soc.369:L27-L31,2006

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, 2 tables; v3: references added, presentation improved; Supplementary material at http://www.physik.uni-b

Scientific paper

10.1111/j.1745-3933.2006.00167.x

The microwave sky shows unexpected features at the largest angular scales, among them the alignments of the dipole, quadrupole and octopole. Motivated by recent X-ray cluster studies, we investigate the possibility that local structures at the 100 h^(-1) Mpc scale could be responsible for such correlations. These structures give rise to a local Rees-Sciama contribution to the microwave sky that may amount to Delta T/T ~ 10^(-5) at the largest angular scales. We model local structures by a spherical overdensity (Lemaitre-Tolman-Bondi model) and assume that the Local Group is falling toward the centre. We superimpose the local Rees-Sciama effect on a statistically isotropic, gaussian sky. As expected we find alignments among low multipoles, but a closer look reveals that they do not agree with the type of correlations revealed by the data.

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