An estimate of the local ISW signal, and its impact on CMB anomalies

Details An estimate of the local ISW signal, and its impact on CMB anomalies An estimate of the local ISW signal, and its impact on CMB anomalies

2009-09-14

arxiv.org/abs/0909.2495v3

MNRAS 406, 14 (2010)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages. MNRAS in press. Final minor updates to text and references to match published version

Scientific paper

We estimate the local density field in redshift shells to a maximum redshift of z=0.3, using photometric redshifts for the 2MASS galaxy catalogue, matched to optical data from the SuperCOSMOS galaxy catalogue. This density-field map is used to predict the Integrated Sachs-Wolfe (ISW) 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 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.

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