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  Fractional polarization of extragalactic sources in the 500 deg2 SPTpol survey

Gupta, N., Reichardt, C. L., Ade, P. A. R., Anderson, A. J., Archipley, M., Austermann, J. E., et al. (2019). Fractional polarization of extragalactic sources in the 500 deg2 SPTpol survey. Monthly Notices of the Royal Astronomical Society, 490(4), 5712-5721. doi:10.1093/mnras/stz2905.

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Gupta, N., Author
Reichardt, C. L., Author
Ade, P. A. R., Author
Anderson, A. J., Author
Archipley, M., Author
Austermann, J. E., Author
Avva, J. S., Author
Beall, J. A., Author
Bender, A. N., Author
Benson, B. A., Author
Bianchini, F., Author
Bleem, L. E., Author
Carlstrom, J. E., Author
Chang, C. L., Author
Chiang, H. C., Author
Citron, R., Author
Moran, C. Corbett, Author
Crawford, T. M., Author
Crites, A. T., Author
de Haan, T., Author
Dobbs, M. A., AuthorEverett, W., AuthorFeng, C., AuthorGallicchio, J., AuthorGeorge, E. M., AuthorGilbert, A., AuthorHalverson, N. W., AuthorHarrington, N., AuthorHenning, J. W., AuthorHilton, G. C., AuthorHolder, G. P., AuthorHolzapfel, W. L., AuthorHou, Z., AuthorHrubes, J. D., AuthorHuang, N., AuthorHubmayr, J., AuthorIrwin, K. D., AuthorKnox, L., AuthorLee, A. T., AuthorLi, D., AuthorLowitz, A., AuthorLuong-Van, D., AuthorMarrone, D. P., AuthorMcMahon, J. J., AuthorMeyer, S. S., AuthorMocanu, L. M., AuthorMohr, J. J.1, Author              Montgomery, J., AuthorNadolski, A., AuthorNatoli, T., AuthorNibarger, J. P., AuthorNoble, G. I., AuthorNovosad, V., AuthorPadin, S., AuthorPatil, S., AuthorPryke, C., AuthorRuhl, J. E., AuthorSaliwanchik, B. R., AuthorSayre, J.T., AuthorSchaffer, K. K., AuthorShirokoff, E., AuthorSievers, C., AuthorSmecher, G., AuthorStaniszewski, Z., AuthorStark, A. A., AuthorStory, K. T., AuthorSwitzer, E. R., AuthorTucker, C., AuthorVanderlinde, K., AuthorVeach, T., AuthorVieira, J. D., AuthorWang, G., AuthorWhitehorn, N., AuthorWilliamson, R., AuthorWu, W. L. K., AuthorYefremenko, V., AuthorZhang, L., Author more..
Affiliations:
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 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 < 16.9 × 10−3 and 〈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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 Dates: 2019-10-24
 Publication Status: Published online
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stz2905
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Title: Monthly Notices of the Royal Astronomical Society
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Source Genre: Journal
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Publ. Info: OXFORD : OXFORD UNIV PRESS
Pages: - Volume / Issue: 490 (4) Sequence Number: - Start / End Page: 5712 - 5721 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470