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Fractional polarization of extragalactic sources in the 500 deg² SPTpol survey

Gupta, N. and Moran, C. Corbett and Crites, A. T. and Padin, S. (2019) Fractional polarization of extragalactic sources in the 500 deg² SPTpol survey. Monthly Notices of the Royal Astronomical Society, 490 (4). pp. 5712-5721. ISSN 0035-8711. doi:10.1093/mnras/stz2905.

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We study the polarization properties of extragalactic sources at 95 and 150 GHz in the SPTpol 500 deg² survey. We estimate the polarized power by stacking maps at known source positions, and correct for noise bias by subtracting the mean polarized power at random positions in the maps. We show that the method is unbiased using a set of simulated maps with similar noise properties to the real SPTpol maps. We find a flux-weighted mean-squared polarization fraction 〈p²〉 = [8.9 ± 1.1] × 10⁻⁴ at 95 GHz and [6.9 ± 1.1] × 10⁻⁴ at 150 GHz for the full sample. This is consistent with the values obtained for a subsample of active galactic nuclei. For dusty sources, we find 95 per cent upper limits of 〈p²〉₉₅ < 16.9 × 10⁻³and 〈p²〉₁₅₀ < 2.6 × 10⁻³. We find no evidence that the polarization fraction depends on the source flux or observing frequency. The 1σ upper limit on measured mean-squared polarization fraction at 150 GHz implies that extragalactic foregrounds will be subdominant to the CMB E and B mode polarization power spectra out to at least ℓ ≲ 5700 (ℓ ≲ 4700) and ℓ ≲ 5300 (ℓ ≲ 3600), respectively, at 95 (150) GHz.

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URLURL TypeDescription Paper
Moran, C. Corbett0000-0003-2088-7465
Alternate Title:Fractional Polarisation of Extragalactic Sources in the 500-square-degree SPTpol Survey
Additional Information:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2019 October 7. Received 2019 October 1; in original form 2019 July 11. Published: 21 October 2019. South Pole Telescope (SPT) is supported by the National Science Foundation through grant PLR-1248097. Partial support is also provided by the NSF Physics Frontier Center grant PHY-1125897 to the Kavli Institute of Cosmological Physics at the University of Chicago, the Kavli Foundation, and the Gordon and Betty Moore Foundation grant GBMF 947. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The Melbourne group acknowledges support from the Australian Research Council’s Discovery Projects scheme (DP150103208).
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore FoundationGBMF 947
Department of Energy (DOE)DE-AC02-05CH11231
Australian Research CouncilDP150103208
Subject Keywords:polarization – galaxies: active – cosmology: observations
Issue or Number:4
Record Number:CaltechAUTHORS:20200110-130818682
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Official Citation:N Gupta, C L Reichardt, P A R Ade, A J Anderson, M Archipley, J E Austermann, J S Avva, J A Beall, A N Bender, B A Benson, F Bianchini, L E Bleem, J E Carlstrom, C L Chang, H C Chiang, R Citron, C Corbett Moran, T M Crawford, A T Crites, T de Haan, M A Dobbs, W Everett, C Feng, J Gallicchio, E M George, A Gilbert, N W Halverson, N Harrington, J W Henning, G C Hilton, G P Holder, W L Holzapfel, Z Hou, J D Hrubes, N Huang, J Hubmayr, K D Irwin, L Knox, A T Lee, D Li, A Lowitz, D Luong-Van, D P Marrone, J J McMahon, S S Meyer, L M Mocanu, J J Mohr, J Montgomery, A Nadolski, T Natoli, J P Nibarger, G I Noble, V Novosad, S Padin, S Patil, C Pryke, J E Ruhl, B R Saliwanchik, J T Sayre, K K Schaffer, E Shirokoff, C Sievers, G Smecher, Z Staniszewski, A A Stark, K T Story, E R Switzer, C Tucker, K Vanderlinde, T Veach, J D Vieira, G Wang, N Whitehorn, R Williamson, W L K Wu, V Yefremenko, L Zhang, Fractional polarization of extragalactic sources in the 500 deg2 SPTpol survey, Monthly Notices of the Royal Astronomical Society, Volume 490, Issue 4, December 2019, Pages 5712–5721,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100626
Deposited By: Tony Diaz
Deposited On:11 Jan 2020 00:47
Last Modified:16 Nov 2021 17:55

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