A measurement of the cosmic microwave background gravitational lensing potential from 100 square degrees of SPTpol data
- Univ. of Chicago, Chicago, IL (United States)
- McGill Univ., Montreal, QC (Canada)
- Cardiff Univ., Cardiff (United Kingdom)
- Univ. of Colorado, Boulder, CO (United States)
- NIST Quantum Devices Group, Boulder, CO (United States)
- McGill Univ., Montreal, QC (Canada); Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Chicago, Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of KwaZulu-Natal, Durban (South Africa)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. of California, Berkeley, CA (United States)
- McGill Univ., Montreal, QC (Canada); Canadian Institute for Advanced Research, Toronto, ON (Canada)
- Univ. of Chicago, Chicago, IL (United States); Univ. of Colorado, Boulder, CO (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
- Stanford Univ., Stanford, CA (United States)
- Univ. of California, Davis, CA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- NIST Quantum Devices Group, Boulder, CO (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Case Western Reserve Univ., Cleveland, OH (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Chicago, Chicago, IL (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
- Univ. of California, Berkeley, CA (United States); Univ. of Melbourne (Australia)
- Univ. of Chicago, Chicago, IL (United States); School of the Art Institute of Chicago, Chicago, IL (United States)
- McGill Univ., Montreal, QC (Canada); Three-Speed Logic, Inc., Vancouver, BC (Canada)
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
- Univ. of Toronto, Toronto, ON (Canada)
- Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Here, 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. The observations used in this work cover 100 deg2 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 $$100\lt L\lt 250$$. 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 $$100\lt L\lt 2000$$ as our primary result. We constrain the ratio of the spectrum to a fiducial ΛCDM model to be AMV = 0.92 ± 0.14 (Stat.) ± 0.08 (Sys.). Restricting ourselves to polarized data only, we find APOL = 0.92 ± 0.24 (Stat.) ± 0.11 (Sys.). This measurement rejects the hypothesis of no lensing at $$5.9\sigma $$ using polarization data alone, and at $$14\sigma $$ using both temperature and polarization data.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1326855
- Report Number(s):
- SLAC-PUB-16712
- Journal Information:
- The Astrophysical Journal (Online), Vol. 810, Issue 1; ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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