Microwave sky and the local Rees-Sciama effect

Abstract

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.

6 pages, 2 figures, 2 tables; v3: references added, presentation improved; Supplementary material at http://www.physik.uni-bielefeld.de/cosmology/rs.html

Cited by in corpus (41)

• CMB Anomalies after Planck
• An Imprint of Super-Structures on the Microwave Background due to the Integrated Sachs-Wolfe Effect
• The Uncorrelated Universe: Statistical Anisotropy and the Vanishing Angular Correlation Function in WMAP Years 1-3
• Large-angle anomalies in the CMB
• Cosmic clocks, cosmic variance and cosmic averages
• Cosmic Microwave Background Quadrupole and Ellipsoidal Universe
• Cosmic radio dipole from NVSS and WENSS
• Accelerated expansion from structure formation
• Local Voids as the Origin of Large-angle Cosmic Microwave Background Anomalies I
• CMB anisotropies seen by an off-center observer in a spherically symmetric inhomogeneous universe
• CMB multipole measurements in the presence of foregrounds
• Nonlinear Structure Formation and "Apparent" Acceleration: an Investigation
• Local Voids as the Origin of Large-angle Cosmic Microwave Background Anomalies: The Effect of a Cosmological Constant
• Light propagation in statistically homogeneous and isotropic universes with general matter content
• The supernova Hubble diagram for off-center observers in a spherically symmetric inhomogeneous universe
• Lack of large-angle TT correlations persists in WMAP and Planck
• Large-scale alignments from WMAP and Planck
• The Szekeres Swiss Cheese model and the CMB observations
• Correlating anomalies of the microwave sky: The Good, the Evil and the Axis
• Alignment tests for low CMB multipoles
• An estimate of the local ISW signal, and its impact on CMB anomalies
• Testing Isotropy of Cosmic Microwave Background Radiation
• Anomalies in the low CMB multipoles and extended foregrounds
• Differential cosmic expansion and the Hubble flow anisotropy
• Signals of Statistical Anisotropy in WMAP Foreground-Cleaned Maps
• Impact of local structure on the cosmic radio dipole
• Large scale anisotropy due to pre-inflationary phase of cosmic evolution
• CMB statistics in noncommutative inflation
• Steerable wavelet analysis of CMB structures alignment
• The actual Rees--Sciama effect from the Local Universe
• J0454-0309: Evidence for a strong lensing fossil group falling into a poor galaxy cluster
• Effect of Foregrounds on the CMBR Multipole Alignment
• Cosmological Implications of the CMB Large-scale Structure
• Large Scale Traces of Solar System Cold Dust on CMB Anisotropies
• DESIgning concordant distances in the age of precision cosmology: the impact of density fluctuations
• Cross-correlation analysis of CMB with foregrounds for residuals
• Influence of the local Universe on weak gravitational lensing surveys
• Modelling the WMAP large-angle anomalies as an effect of a local density inhomogeneity
• Impact of our local environment on cosmological statistics
• Emergent universe revisited through the CSL theory
• Nearly Full-Sky Low-Multipole Cosmic Microwave Background Temperature Anisotropy: III. CMB Temperature Anomalies