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Title: CMB Polarization B-mode Delensing with SPTpol and Herschel

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 deg(2) 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 $28$% in the multipole range $$300\lt {\ell }\lt 2300,$$ 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 $$6.9\sigma $$. 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.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Kavli Institute for Cosmological Physics; Natural Sciences and Engineering Research Council of Canada (NSERC)
Contributing Org.:
SPT; Herschel
OSTI Identifier:
1393901
Alternate Identifier(s):
OSTI ID: 1346362; OSTI ID: 1394092
Report Number(s):
FERMILAB-PUB-17-039-A-AE-PPD; arXiv:1701.04396
Journal ID: ISSN 1538-4357; 1509218
Grant/Contract Number:  
AC02-07CH11359; AC02-06CH11357; PLR-1248097; AST-0956135; AST-1402161; AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 846; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmic background radiation; cosmology: observations; gravitational lensing

Citation Formats

Manzotti, A., Story, K. T., Wu, W. L. K., Austermann, J. E., Beall, J. A., Bender, A. N., Benson, B. A., Bleem, L. E., Bock, J. J., Carlstrom, J. E., Chang, C. L., Chiang, H. C., Cho, H-M., Citron, R., Conley, A., Crawford, T. M., Crites, A. T., de Haan, T., Dobbs, M. A., Dodelson, S., Everett, W., Gallicchio, J., George, E. M., Gilbert, A., Halverson, N. W., Harrington, N., Henning, J. W., Hilton, G. C., Holder, G. P., Holzapfel, W. L., Hoover, S., Hou, Z., Hrubes, J. D., Huang, N., Hubmayr, J., Irwin, K. D., Keisler, R., Knox, L., Lee, A. T., Leitch, E. M., Li, D., McMahon, J. J., Meyer, S. S., Mocanu, L. M., Natoli, T., Nibarger, J. P., Novosad, V., Padin, S., Pryke, C., Reichardt, C. L., Ruhl, J. E., Saliwanchik, B. R., Sayre, J. T., Schaffer, K. K., Smecher, G., Stark, A. A., Vanderlinde, K., Vieira, J. D., Viero, M. P., Wang, G., Whitehorn, N., Yefremenko, V., and Zemcov, M.. CMB Polarization B-mode Delensing with SPTpol and Herschel. United States: N. p., 2017. Web. doi:10.3847/1538-4357/aa82bb.
Manzotti, A., Story, K. T., Wu, W. L. K., Austermann, J. E., Beall, J. A., Bender, A. N., Benson, B. A., Bleem, L. E., Bock, J. J., Carlstrom, J. E., Chang, C. L., Chiang, H. C., Cho, H-M., Citron, R., Conley, A., Crawford, T. M., Crites, A. T., de Haan, T., Dobbs, M. A., Dodelson, S., Everett, W., Gallicchio, J., George, E. M., Gilbert, A., Halverson, N. W., Harrington, N., Henning, J. W., Hilton, G. C., Holder, G. P., Holzapfel, W. L., Hoover, S., Hou, Z., Hrubes, J. D., Huang, N., Hubmayr, J., Irwin, K. D., Keisler, R., Knox, L., Lee, A. T., Leitch, E. M., Li, D., McMahon, J. J., Meyer, S. S., Mocanu, L. M., Natoli, T., Nibarger, J. P., Novosad, V., Padin, S., Pryke, C., Reichardt, C. L., Ruhl, J. E., Saliwanchik, B. R., Sayre, J. T., Schaffer, K. K., Smecher, G., Stark, A. A., Vanderlinde, K., Vieira, J. D., Viero, M. P., Wang, G., Whitehorn, N., Yefremenko, V., & Zemcov, M.. CMB Polarization B-mode Delensing with SPTpol and Herschel. United States. doi:10.3847/1538-4357/aa82bb.
Manzotti, A., Story, K. T., Wu, W. L. K., Austermann, J. E., Beall, J. A., Bender, A. N., Benson, B. A., Bleem, L. E., Bock, J. J., Carlstrom, J. E., Chang, C. L., Chiang, H. C., Cho, H-M., Citron, R., Conley, A., Crawford, T. M., Crites, A. T., de Haan, T., Dobbs, M. A., Dodelson, S., Everett, W., Gallicchio, J., George, E. M., Gilbert, A., Halverson, N. W., Harrington, N., Henning, J. W., Hilton, G. C., Holder, G. P., Holzapfel, W. L., Hoover, S., Hou, Z., Hrubes, J. D., Huang, N., Hubmayr, J., Irwin, K. D., Keisler, R., Knox, L., Lee, A. T., Leitch, E. M., Li, D., McMahon, J. J., Meyer, S. S., Mocanu, L. M., Natoli, T., Nibarger, J. P., Novosad, V., Padin, S., Pryke, C., Reichardt, C. L., Ruhl, J. E., Saliwanchik, B. R., Sayre, J. T., Schaffer, K. K., Smecher, G., Stark, A. A., Vanderlinde, K., Vieira, J. D., Viero, M. P., Wang, G., Whitehorn, N., Yefremenko, V., and Zemcov, M.. Wed . "CMB Polarization B-mode Delensing with SPTpol and Herschel". United States. doi:10.3847/1538-4357/aa82bb. https://www.osti.gov/servlets/purl/1393901.
@article{osti_1393901,
title = {CMB Polarization B-mode Delensing with SPTpol and Herschel},
author = {Manzotti, A. and Story, K. T. and Wu, W. L. K. and Austermann, J. E. and Beall, J. A. and Bender, A. N. and Benson, B. A. and Bleem, L. E. and Bock, J. J. and Carlstrom, J. E. and Chang, C. L. and Chiang, H. C. and Cho, H-M. and Citron, R. and Conley, A. and Crawford, T. M. and Crites, A. T. and de Haan, T. and Dobbs, M. A. and Dodelson, S. and Everett, W. and Gallicchio, J. and George, E. M. and Gilbert, A. and Halverson, N. W. and Harrington, N. and Henning, J. W. and Hilton, G. C. and Holder, G. P. and Holzapfel, W. L. and Hoover, S. and Hou, Z. and Hrubes, J. D. and Huang, N. and Hubmayr, J. and Irwin, K. D. and Keisler, R. and Knox, L. and Lee, A. T. and Leitch, E. M. and Li, D. and McMahon, J. J. and Meyer, S. S. and Mocanu, L. M. and Natoli, T. and Nibarger, J. P. and Novosad, V. and Padin, S. and Pryke, C. and Reichardt, C. L. and Ruhl, J. E. and Saliwanchik, B. R. and Sayre, J. T. and Schaffer, K. K. and Smecher, G. and Stark, A. A. and Vanderlinde, K. and Vieira, J. D. and Viero, M. P. and Wang, G. and Whitehorn, N. and Yefremenko, V. and Zemcov, M.},
abstractNote = {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 deg(2) 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 $28$% in the multipole range $300\lt {\ell }\lt 2300,$ 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 $6.9\sigma $. 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.},
doi = {10.3847/1538-4357/aa82bb},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 846,
place = {United States},
year = {Wed Aug 30 00:00:00 EDT 2017},
month = {Wed Aug 30 00:00:00 EDT 2017}
}

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