Fractional polarization of extragalactic sources in the 500 deg2 SPTpol survey

Autor: C. Sievers, J. T. Sayre, A. E. Lowitz, Jeff McMahon, Christian L. Reichardt, C. Corbett Moran, John E. Carlstrom, K. K. Schaffer, T. de Haan, V. G. Yefremenko, D. Luong-Van, Eric R. Switzer, Robert I. Citron, Dale Li, V. Novosad, Chihway Chang, A. T. Crites, Jessica Avva, C. Pryke, Kent D. Irwin, W. L. K. Wu, Johannes Hubmayr, R. Williamson, M. Archipley, Elizabeth George, N. Huang, John P. Nibarger, K. Vanderlinde, W. L. Holzapfel, A. A. Stark, J. D. Hrubes, Andrew Nadolski, H. C. Chiang, T. Natoli, T. Veach, Gene C. Hilton, Nikhel Gupta, W. B. Everett, G. I. Noble, Federico Bianchini, Adrian T. Lee, Lloyd Knox, Peter A. R. Ade, S. S. Meyer, Lindsey Bleem, J. E. Ruhl, K. T. Story, Joseph J. Mohr, S. Patil, Chang Feng, M. A. Dobbs, G. P. Holder, Jason Gallicchio, Nathan Whitehorn, Jason W. Henning, Zhen Hou, L. Zhang, N. W. Halverson, N. L. Harrington, Joshua Montgomery, Erik Shirokoff, J. A. Beall, Benjamin Saliwanchik, Bradford Benson, Z. K. Staniszewski, Carole Tucker, Jason E. Austermann, Graeme Smecher, A. J. Gilbert, Adam Anderson, L. M. Mocanu, Daniel P. Marrone, S. Padin, Gensheng Wang, Andreas Bender, Joaquin Vieira, T. M. Crawford
Rok vydání: 2019
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society. 490:5712-5721
ISSN: 1365-2966
0035-8711
Popis: Author(s): Gupta, N; Reichardt, CL; Ade, PAR; Anderson, AJ; Archipley, M; Austermann, JE; Avva, JS; Beall, JA; Bender, AN; Benson, BA; Bianchini, F; Bleem, LE; Carlstrom, JE; Chang, CL; Chiang, HC; Citron, R; Corbett Moran, C; Crawford, TM; Crites, AT; de Haan, T; Dobbs, MA; Everett, W; Feng, C; Gallicchio, J; George, EM; Gilbert, A; Halverson, NW; Harrington, N; Henning, JW; Hilton, GC; Holder, GP; Holzapfel, WL; Hou, Z; Hrubes, JD; Huang, N; Hubmayr, J; Irwin, KD; Knox, L; Lee, AT; Li, D; Lowitz, A; Luong-Van, D; Marrone, DP; McMahon, JJ; Meyer, SS; Mocanu, LM; Mohr, JJ; Montgomery, J; Nadolski, A; Natoli, T; Nibarger, JP; Noble, GI; Novosad, V; Padin, S; Patil, S; Pryke, C; Ruhl, JE; Saliwanchik, BR; Sayre, JT; Schaffer, KK; Shirokoff, E; Sievers, C; Smecher, G; Staniszewski, Z; Stark, AA; Story, KT; Switzer, ER; Tucker, C; Vanderlinde, K; Veach, T; Vieira, JD; Wang, G; Whitehorn, N; Williamson, R; Wu, WLK; Yefremenko, V; Zhang, L | Abstract: 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 l 16.9 × 10−3 and 〈p2〉150 l 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.
Databáze: OpenAIRE
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