An estimate of the local integrated Sachs-Wolfe signal and its impact on cosmic microwave background anomalies

2010/06/25 by Caroline L. Francis, John A. Peacock, J. A. Peacock · 5 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Radio Astronomy Observations and Technology #Galaxies: Formation, Evolution, Phenomena

paper · doi:10.1111/j.1365-2966.2010.16866.x

Abstract

We estimate the local density field in redshift shells to a maximum redshift of z= 0.3, using photometric redshifts for the Two-Micron All-Sky Survey galaxy catalogue, matched to optical data from the SuperCOSMOS galaxy catalogue. This density-field map is used to predict the integrated Sachs–Wolfe (ISW) cosmic microwave background (CMB) anisotropies that originate within the volume at z < 0.3. We investigate the impact of this estimated ISW foreground signal on large-scale anomalies in the Wilkinson Microwave Anisotropy Probe (WMAP) CMB data. We find that removal of the foreground ISW signal from WMAP data reduces the significance of a number of reported large-scale anomalies in the CMB, including the low quadrupole power and the apparent alignment between the CMB quadrupole and octopole.

Citations

• On the large-angle anomalies of the microwave sky
• No large-angle correlations on the non-Galactic microwave sky

Cited by

• Lack of large-angle TT correlations persists in WMAP and Planck
• Large-scale alignments from WMAP and Planck
• The cosmic shallows – I. Interaction of CMB photons in extended galaxy haloes
• SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: ARE THERE COSMIC MICROWAVE BACKGROUND ANOMALIES?
• Nearly full-sky low-multipole CMB temperature anisotropy: III. CMB anomalies

Related

• A novel integrated Sachs-Wolfe effect from Early Dark Energy
• Cross-correlating the Microwave Sky with Galaxy Surveys
• Can the CIB constrain the dark energy?
• On finding gravitational waves from anisotropies of the Cosmic Microwave Background
• Dark Energy Detected with Supervoids and Superclusters