Measuring gravitational lensing of the cosmic microwave background using cross correlation with large scale structure

被引：24

作者：

Feng, Chang ^{[1
,2
]}

Aslanyan, Grigor ^{[3
]}

Manohar, Aneesh V. ^{[3
]}

Keating, Brian ^{[1
,2
,3
]}

Paar, Hans P. ^{[1
,2
,3
]}

Zahn, Oliver ^{[4
,5
]}

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 San Diego, Dept Phys, La Jolla, CA 92093 USA

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

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

来源：

PHYSICAL REVIEW D | 2012年 / 86卷 / 06期

关键词：

PROBE WMAP OBSERVATIONS; POWER SPECTRUM;

D O I：

10.1103/PhysRevD.86.063519

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We cross correlate the gravitational lensing map extracted from cosmic microwave background measurements by the Wilkinson Microwave Anisotropy Probe with the radio galaxy distribution from the NRAO VLA Sky Survey (NVSS) by using a quadratic estimator technique. We use the full covariance matrix to filter the data, and calculate the cross-power spectra for the lensing-galaxy correlation. We explore the impact of changing the values of cosmological parameters on the lensing reconstruction, and obtain statistical detection significances at >3 sigma. The results of all cross correlations pass the curl null test as well as a complementary diagnostic test using the NVSS data in equatorial coordinates. We forecast the potential for Planck and NVSS to constrain the lensing-galaxy cross correlation as well as the galaxy bias. The lensing-galaxy cross-power spectra are found to be Gaussian distributed.

引用

页数：15

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