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Title: Measurements of sub-degree B-mode polarization in the cosmic microwave background from 100 square degrees of SPTPOL data

Abstract

We present a measurement of the B-mode polarization power spectrum (the BB spectrum) from 100 $${\mathrm{deg}}^{2}$$ of sky observed with SPTpol, a polarization-sensitive receiver currently installed on the South Pole Telescope. The observations used in this work were taken during 2012 and early 2013 and include data in spectral bands centered at 95 and 150 GHz. We report the BB spectrum in five bins in multipole space, spanning the range $$300\leqslant {\ell }\leqslant 2300$$, and for three spectral combinations: 95 GHz × 95 GHz, 95 GHz × 150 GHz, and 150 GHz × 150 GHz. We subtract small (<0.5σ in units of statistical uncertainty) biases from these spectra and account for the uncertainty in those biases. The resulting power spectra are inconsistent with zero power but consistent with predictions for the BB spectrum arising from the gravitational lensing of E-mode polarization. If we assume no other source of BB power besides lensed B modes, we determine a preference for lensed B modes of 4.9σ. After marginalizing over tensor power and foregrounds, namely, polarized emission from galactic dust and extragalactic sources, this significance is 4.3σ. Fitting for a single parameter, $${A}_{\mathrm{lens}}$$, that multiplies the predicted lensed B-mode spectrum, and marginalizing over tensor power and foregrounds, we find $${A}_{\mathrm{lens}}=1.08\pm 0.26$$, indicating that our measured spectra are consistent with the signal expected from gravitational lensing. The data presented here provide the best measurement to date of the B-mode power spectrum on these angular scales.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1335093
Report Number(s):
SLAC-PUB-16741
Journal ID: ISSN 1538-4357; arXiv:1503.02315
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Volume: 807; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astrophysics; ASTRO

Citation Formats

Keisler, R., Hoover, S., Harrington, N., Henning, J. W., Ade, P. A. R., Aird, K. A., Austermann, J. E., Beall, J. A., Bender, A. N., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Chiang, H. C., Cho, H-M., Citron, R., Crawford, T. M., Crites, A. T., de Haan, T., Dobbs, M. A., Everett, W., Gallicchio, J., Gao, J., George, E. M., Gilbert, A., Halverson, N. W., Hanson, D., Hilton, G. C., Holder, G. P., Holzapfel, W. L., Hou, Z., Hrubes, J. D., Huang, N., Hubmayr, J., Irwin, K. D., Knox, L., Lee, A. T., Leitch, E. M., Li, D., Luong-Van, D., Marrone, D. P., McMahon, J. J., Mehl, J., Meyer, S. S., Mocanu, L., 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., Shirokoff, E., Smecher, G., Stark, A. A., Story, K. T., Tucker, C., Vanderlinde, K., Vieira, J. D., Wang, G., Whitehorn, N., Yefremenko, V., and Zahn, O. Measurements of sub-degree B-mode polarization in the cosmic microwave background from 100 square degrees of SPTPOL data. United States: N. p., 2015. Web. doi:10.1088/0004-637X/807/2/151.
Keisler, R., Hoover, S., Harrington, N., Henning, J. W., Ade, P. A. R., Aird, K. A., Austermann, J. E., Beall, J. A., Bender, A. N., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Chiang, H. C., Cho, H-M., Citron, R., Crawford, T. M., Crites, A. T., de Haan, T., Dobbs, M. A., Everett, W., Gallicchio, J., Gao, J., George, E. M., Gilbert, A., Halverson, N. W., Hanson, D., Hilton, G. C., Holder, G. P., Holzapfel, W. L., Hou, Z., Hrubes, J. D., Huang, N., Hubmayr, J., Irwin, K. D., Knox, L., Lee, A. T., Leitch, E. M., Li, D., Luong-Van, D., Marrone, D. P., McMahon, J. J., Mehl, J., Meyer, S. S., Mocanu, L., 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., Shirokoff, E., Smecher, G., Stark, A. A., Story, K. T., Tucker, C., Vanderlinde, K., Vieira, J. D., Wang, G., Whitehorn, N., Yefremenko, V., & Zahn, O. Measurements of sub-degree B-mode polarization in the cosmic microwave background from 100 square degrees of SPTPOL data. United States. doi:10.1088/0004-637X/807/2/151.
Keisler, R., Hoover, S., Harrington, N., Henning, J. W., Ade, P. A. R., Aird, K. A., Austermann, J. E., Beall, J. A., Bender, A. N., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Chiang, H. C., Cho, H-M., Citron, R., Crawford, T. M., Crites, A. T., de Haan, T., Dobbs, M. A., Everett, W., Gallicchio, J., Gao, J., George, E. M., Gilbert, A., Halverson, N. W., Hanson, D., Hilton, G. C., Holder, G. P., Holzapfel, W. L., Hou, Z., Hrubes, J. D., Huang, N., Hubmayr, J., Irwin, K. D., Knox, L., Lee, A. T., Leitch, E. M., Li, D., Luong-Van, D., Marrone, D. P., McMahon, J. J., Mehl, J., Meyer, S. S., Mocanu, L., 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., Shirokoff, E., Smecher, G., Stark, A. A., Story, K. T., Tucker, C., Vanderlinde, K., Vieira, J. D., Wang, G., Whitehorn, N., Yefremenko, V., and Zahn, O. Thu . "Measurements of sub-degree B-mode polarization in the cosmic microwave background from 100 square degrees of SPTPOL data". United States. doi:10.1088/0004-637X/807/2/151. https://www.osti.gov/servlets/purl/1335093.
@article{osti_1335093,
title = {Measurements of sub-degree B-mode polarization in the cosmic microwave background from 100 square degrees of SPTPOL data},
author = {Keisler, R. and Hoover, S. and Harrington, N. and Henning, J. W. and Ade, P. A. R. and Aird, K. A. and Austermann, J. E. and Beall, J. A. and Bender, A. N. and Benson, B. A. and Bleem, L. E. and Carlstrom, J. E. and Chang, C. L. and Chiang, H. C. and Cho, H-M. and Citron, R. and Crawford, T. M. and Crites, A. T. and de Haan, T. and Dobbs, M. A. and Everett, W. and Gallicchio, J. and Gao, J. and George, E. M. and Gilbert, A. and Halverson, N. W. and Hanson, D. and Hilton, G. C. and Holder, G. P. and Holzapfel, W. L. and Hou, Z. and Hrubes, J. D. and Huang, N. and Hubmayr, J. and Irwin, K. D. and Knox, L. and Lee, A. T. and Leitch, E. M. and Li, D. and Luong-Van, D. and Marrone, D. P. and McMahon, J. J. and Mehl, J. and Meyer, S. S. and Mocanu, L. 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 Shirokoff, E. and Smecher, G. and Stark, A. A. and Story, K. T. and Tucker, C. and Vanderlinde, K. and Vieira, J. D. and Wang, G. and Whitehorn, N. and Yefremenko, V. and Zahn, O.},
abstractNote = {We present a measurement of the B-mode polarization power spectrum (the BB spectrum) from 100 ${\mathrm{deg}}^{2}$ of sky observed with SPTpol, a polarization-sensitive receiver currently installed on the South Pole Telescope. The observations used in this work were taken during 2012 and early 2013 and include data in spectral bands centered at 95 and 150 GHz. We report the BB spectrum in five bins in multipole space, spanning the range $300\leqslant {\ell }\leqslant 2300$, and for three spectral combinations: 95 GHz × 95 GHz, 95 GHz × 150 GHz, and 150 GHz × 150 GHz. We subtract small (<0.5σ in units of statistical uncertainty) biases from these spectra and account for the uncertainty in those biases. The resulting power spectra are inconsistent with zero power but consistent with predictions for the BB spectrum arising from the gravitational lensing of E-mode polarization. If we assume no other source of BB power besides lensed B modes, we determine a preference for lensed B modes of 4.9σ. After marginalizing over tensor power and foregrounds, namely, polarized emission from galactic dust and extragalactic sources, this significance is 4.3σ. Fitting for a single parameter, ${A}_{\mathrm{lens}}$, that multiplies the predicted lensed B-mode spectrum, and marginalizing over tensor power and foregrounds, we find ${A}_{\mathrm{lens}}=1.08\pm 0.26$, indicating that our measured spectra are consistent with the signal expected from gravitational lensing. The data presented here provide the best measurement to date of the B-mode power spectrum on these angular scales.},
doi = {10.1088/0004-637X/807/2/151},
journal = {The Astrophysical Journal (Online)},
issn = {1538-4357},
number = 2,
volume = 807,
place = {United States},
year = {2015},
month = {7}
}

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