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.

arXiv comment6 pages, 2 figures, 2 tables; v3: references added, presentation improved; Supplementary material at http://www.physik.uni-bielefeld.de/cosmology/rs.html

References in corpus (26)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground Emission
• Asymmetries in the CMB anisotropy field
• A high resolution foreground cleaned CMB map from WMAP
• The significance of the largest scale CMB fluctuations in WMAP
• Is the low-l microwave background cosmic?
• Dipole Anisotropy in the COBE DMR First-Year Sky Maps
• Multipole Vectors--a new representation of the CMB sky and evidence for statistical anisotropy or non-Gaussianity at 2<=l<=8
• On the large-angle anomalies of the microwave sky
• On Foreground Removal from the Wilkinson Microwave Anisotropy Probe Data by an Internal Linear Combination Method: Limitations and Implications
• Spontaneous Isotropy Breaking: A Mechanism for CMB Multipole Alignments
• 2-Point Correlations in the COBE DMR 4-Year Anisotropy Maps
• The Supercluster-Void Network I. The Supercluster Catalogue and Large-Scale Distribution
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing Methods and Systematic Errors Limits
• Streaming motions of galaxy clusters within 12000 km/s - V. The peculiar velocity field
• Cosmic Microwave Background, Accelerating Universe and Inhomogeneous Cosmology
• Analyses of Type Ia Supernova Data in Cosmological Models with a Local Void
• Rees-Sciama Effect in a CDM Universe
• Examining the Effect of the Map-Making Algorithm on Observed Power Asymmetry in WMAP Data
• The X-ray Cluster Dipole
• Dipole Anisotropy from an Entropy Gradient
• Anisotropic Observations in Universes with Nonlinear Inhomogeneity
• Second-order gravitational effects of local inhomogeneities on CMB anisotropies and non-Gaussian signatures
• The Dipole Anisotropy of the First All-Sky X-ray Cluster Sample
• Did WMAP see Moving Local Structures?
• Second-order gravitational effects of local inhomogeneities on CMB anisotropies in nonzero-Lambda flat cosmological models

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• 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