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A Measurement of the Cosmic Microwave Background Gravitational Lensing Potential from 100 Square Degrees of SPTpol Data | | K. T. Story
; D. Hanson
; P. A. R. Ade
; K. A. Aird
; J. E. Austermann
; J. A. Beall
; A. N. Bender
; B. A. Benson
; L. E. Bleem
; J. E. Carlstrom
; C. L. Chang
; H. C. Chiang
; H-M. Cho
; R. Citron
; T. M. Crawford
; A. T. Crites
; T. de Haan
; M. A. Dobbs
; W. Everett
; J. Gallicchio
; J. Gao
; E. M. George
; A. Gilbert
; N. W. Halverson
; N. Harrington
; J. W. Henning
; G. C. Hilton
; G. P. Holder
; W. L. Holzapfel
; S. Hoover
; Z. Hou
; J. D. Hrubes
; N. Huang
; J. Hubmayr
; K. D. Irwin
; R. Keisler
; L. Knox
; A. T. Lee
; E. M. Leitch
; D. Li
; C. Liang
; D. Luong-Van
; J. J. McMahon
; J. Mehl
; S. S. Meyer
; L. Mocanu
; T. E. Montroy
; T. Natoli
; J. P. Nibarger
; V. Novosad
; S. Padin
; C. Pryke
; C. L. Reichardt
; J. E. Ruhl
; B. R. Saliwanchik
; J.T. Sayre
; K. K. Schaffer
; G. Smecher
; A. A. Stark
; C. Tucker
; K. Vanderlinde
; J. D. Vieira
; G. Wang
; N. Whitehorn
; V. Yefremenko
; O. Zahn
; | | Date: |
15 Dec 2014 | | Abstract: | We present a measurement of the cosmic microwave background (CMB)
gravitational lensing potential using data from the first two seasons of
observations with SPTpol, the polarization-sensitive receiver currently
installed on the South Pole Telescope (SPT). The observations used in this work
cover 100 deg$^2$ of sky with arcminute resolution at 150 GHz. Using a
quadratic estimator, we make maps of the CMB lensing potential from
combinations of CMB temperature and polarization maps. We combine these lensing
potential maps to form a minimum-variance (MV) map. The lensing potential is
measured with a signal-to-noise ratio of greater than one for angular
multipoles between $100< L <250$. This is the highest signal-to-noise mass map
made from the CMB to date and will be powerful in cross-correlation with other
tracers of large-scale structure. We calculate the power spectrum of the
lensing potential for each estimator, and we report the value of the MV power
spectrum between $100< L <2000$ as our primary result. We constrain the ratio
of the spectrum to a fiducial $Lambda$CDM model to be $A_{
m MV}=0.92 pm
0.14 {
m, (Stat.)} pm 0.08 {
m, (Sys.)}$. Restricting ourselves to
polarized data only, we find $A_{
m POL}=0.93 pm 0.25 {
m, (Stat.)} pm
0.11 {
m, (Sys.)}$. This measurement rejects the hypothesis of no lensing at
$5.8 sigma$ using polarization data alone, and at $14 sigma$ using both
temperature and polarization data. | | Source: | arXiv, 1412.4760 | | Services: | Forum | Review | PDF | Favorites | |
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