Reconstruction of Gravitational Lensing Using WMAP 7-Year Data

Details Reconstruction of Gravitational Lensing Using WMAP 7-Year Data Reconstruction of Gravitational Lensing Using WMAP 7-Year Data

2011-11-09

arxiv.org/abs/1111.2371v1

Phys. Rev. D 85, 043513 (2012)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 10 figures

Scientific paper

10.1103/PhysRevD.85.043513

Gravitational lensing by large scale structure introduces non-Gaussianity into the Cosmic Microwave Background and imprints a new observable, which can be used as a cosmological probe. We apply a four-point estimator to the Wilkinson Microwave Anisotropy Probe (WMAP) 7-year coadded temperature maps alone to reconstruct the gravitational lensing signal. The Gaussian bias is simulated and subtracted, and the higher order bias is investigated. We measure a gravitational lensing signal with a statistical amplitude of $\mathcal {C}$ = $1.27\pm 0.98$ using all the correlations of the W- and V-band Differencing Assemblies (DAs). We therefore conclude that WMAP 7-year data alone, can not detect lensing.

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