Year: 2017
Type: article
Abstract: We present a demonstration of delensing the observed cosmic microwave background (CMB) B-mode polarization anisotropy. This process of reducing the gravitational-lensing-generated B-mode component will become increasingly important for improving searches for the B modes produced by primordial gravitational waves. In this work, we delens B-mode maps constructed from multi-frequency SPTpol observations of a 90 deg2 patch of sky by subtracting a B-mode template constructed from two inputs: SPTpol E-mode maps and a lensing potential map estimated from the Herschel 500 μm map of the cosmic infrared background. We find that our delensing procedure reduces the measured B-mode power spectrum by % in the multipole range this is shown to be consistent with expectations from simulations and to be robust against systematics. The null hypothesis of no delensing is rejected at . Furthermore, we build and use a suite of realistic simulations to study the general properties of the delensing process and find that the delensing efficiency achieved in this work is limited primarily by the noise in the lensing potential map. We demonstrate the importance of including realistic experimental non-idealities in the delensing forecasts used to inform instrument and survey-strategy planning of upcoming lower-noise experiments, such as CMB-S4.
Source: The Astrophysical Journal
Authors: A. Manzotti, K. T. Story, W. L. K. Wu, J. E. Austermann, J. A. Beall, A. N. Bender, B. A. Benson, L. E. Bleem, J. J. Bock, J. E. Carlstrom, C. L. Chang, H. C. Chiang, H-M. Cho, R. Citron, A. Conley, T. M. Crawford, A. T. Crites, T. de Haan, M. A. Dobbs, S. Dodelson, W. Everett, J. Gallicchio, 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, J. J. McMahon, S. S. Meyer, L. M. Mocanu, 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, K. Vanderlinde, J. D. Vieira, M. P. Viero, G. Wang, N. Whitehorn, V. Yefremenko, M. Zemcov
Institutions: University of Chicago, Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, University of California, Berkeley, National Institute of Standards and Technology, Argonne National Laboratory, Fermi National Accelerator Laboratory, California Institute of Technology, Jet Propulsion Laboratory, University of KwaZulu-Natal, SLAC National Accelerator Laboratory, Canadian Institute for Advanced Research, McGill University, University of Colorado Boulder, Harvey Mudd College, University of Illinois Urbana-Champaign, University of California, Davis, Lawrence Berkeley National Laboratory, University of Michigan, University of Toronto, University of Minnesota, The University of Melbourne, Case Western Reserve University, School of the Art Institute of Chicago, Three-Speed Logic (Canada), Center for Astrophysics Harvard & Smithsonian, Rochester Institute of Technology
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, U.S. Department of Energy, Gordon and Betty Moore Foundation, University of Chicago, McGill University, Croucher Foundation, Canada Research Chairs, Office of Science, University of Colorado Boulder, Natural Sciences and Engineering Research Council of Canada, Argonne National Laboratory
Awards: G102163711, G1055550527, G107546177, Center for Cosmological Physics, G1313983767, G159716036, G1664757510, G2110534122, G2287611682, G262962599, G3075337988, Cosmological Research with the 10-meter South Pole Telescope, G498139845, Signatures of Cosmic Inflation: High-Resolution Studies of the Cosmic Microwave Background, G513797252, G585908603, CAREER: Large focal plane array development for CMB polarization studies with the South Pole Telescope, G6848031779, G6918803902, G86560745, G969889393, G993149817
OpenAlex ID: W2575579273