Reconstruction of gravitational lensing using WMAP 7-year data

被引：11

作者：

Feng, Chang ^{[1
]}

Keating, Brian ^{[1
,2
]}

Paar, Hans P. ^{[1
,2
]}

Zahn, Oliver ^{[3
,4
]}

机构：

[1] Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA

[2] Univ Calif San Diego, Ax Ctr Expt Cosmol, La Jolla, CA 92093 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Berkeley Ctr Cosmol Phys, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW D | 2012年 / 85卷 / 04期

关键词：

POWER SPECTRUM; MICROWAVE; CMB;

D O I：

10.1103/PhysRevD.85.043513

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 C = 1.27 +/- 0.98 using all the correlations of the W- and V-band differencing assemblies. We therefore conclude that WMAP 7-year data alone cannot detect lensing.

引用

页数：9

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