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    Planck intermediate results XLI. A map of lensing-induced B-modes


    Ade, P.A.R., Aghanim, N., Ashdown, M., Aumont, J., Baccigalupi, C., Banday, A.J., Barreiro, R.B., Bartolo, N., Basak, S., Battaner, E., Benabed, K., Benoit-Lévy, A., Bernard, J.-P., Bersanelli, M., Bielewicz, P., Bock, J.J., Borrill, J., Bouchet, F.R., Boulanger, F., Burigana, C., Butler, R.C., Calabrese, E., Cardoso, J.-F., Catalano, A., Chiang, H.C., Christensen, P.R., Clements, D.L., Colombi, S., Colombo, L.P.L., Combet, C., Crill, B.P., Curto, A., Cuttaia, F., Danese, L., Davis, R.J., De Bernardis, P., de Zotti, G., Delabrouille, J., Dickinson, C., Diego, J.M., Dore, O., Ducout, A., Dupac, X., Elsner, F., Enßlin, T.A., Eriksen, H.K., Finelli, F., Forni, O., Frailis, M., Fraisse, A.A., Franceschi, E., Galeotta, S., Galli, S., Ganga, K., Ghosh, T., Giard, M., Giraud-Héraud, Y., Gjerløw, E., Gonzalez-Nuevo, J., Gorski, K.M., Gruppuso, A., Gudmundsson, J.E., Harrison, D., Hernandez-Monteagudo, C., Herranz, D., Hildebrandt, S.R., Hornstrup, A., Hovest, W., Hurier, G., Jaffe, A.H., Jones, W.C., Keihanen, E., Keskitalo, R., Kisner, T.S., Knoche, J., Knox, L., Kunz, M., Kurki-Suonio, H., Lagache, G., Lahteenmaki, A., Lamarre, J.-M., Lasenby, A., Lattanzi, M., Leonardi, R., Levrier, F., Lilje, P.B., Linden-Vornle, M., Lopez-Caniego, M., Lubin, P.M., Macias-Perez, J.F., Maffei, B., Maggio, G., Maino, D., Mandolesi, N., Mangilli, A., Maris, M., Martin, P.G., Martinez-Gonzalez, E., Masi, S., Matarrese, S., Meinhold, P.R., Melchiorri, A., Mennella, A., Migliaccio, M., Mitra, S., Miville-Deschenes, M.-A., Moneti, A., Montier, L., Morgante, G., Mortlock, D., Moss, A., Munshi, D., Murphy, J.Anthony, Naselsky, P., Nati, F., Natoli, P., Netterfield, C.B., Norgaard-Nielsen, H.U., Novikov, D., Novikov, I., Pagano, L., Pajot, F., Paoletti, D., Pasian, F., Patanchon, G., Perdereau, O., Perotto, L., Pettorino, V., Piacentini, F., Piat, M., Pierpaoli, E., Pointecouteau, E., Polenta, G., Pratt, G.W., Rachen, J.P., Reinecke, M., Remazeilles, M., Renault, C., Renzi, A., Ristorcelli, I., Rocha, G., Rosset, C., Rossetti, M., Roudier, G., Rubino-Martin, J.A., Rusholme, B., Sandri, M., Santos, D., Savelainen, M., Savini, G., Scott, D., Spencer, L., Stolyarov, V., Stompor, R., Sudiwala, R., Sunyaev, R., Sutton, D., Suur-Uski, A.-S., Sygnet, J.-F., Tauber, J.A., Terenzi, L., Toffolatti, L., Tomasi, M., Tristram, M., Tucci, M., Tuovinen, J., Valenziano, L., Valiviita, J., Van Tent, B., Vielva, P., Villa, F., Wade, L.A., Wandelt, B.D., Wehus, I., Yvon, D., Zacchei, A. and Zonca, A. (2016) Planck intermediate results XLI. A map of lensing-induced B-modes. Astronomy & Astrophysics, 596 (A102). ISSN 0004-6361

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    Abstract

    The secondary cosmic microwave background (CMB) B-modes stem from the post-decoupling distortion of the polarization E-modes due to the gravitational lensing effect of large-scale structures. These lensing-induced B-modes constitute both a valuable probe of the dark matter distribution and an important contaminant for the extraction of the primary CMB B-modes from inflation. Planck provides accurate nearly all-sky measurements of both the polarization E-modes and the integrated mass distribution via the reconstruction of the CMB lensing potential. By combining these two data products, we have produced an all-sky template map of the lensing-induced B-modes using a real-space algorithm that minimizes the impact of sky masks. The cross-correlation of this template with an observed (primordial and secondary) B-mode map can be used to measure the lensing B-mode power spectrum at multipoles up to 2000. In particular, when cross-correlating with the B-mode contribution directly derived from the Planck polarization maps, we obtain lensing-induced B-mode power spectrum measurement at a significance level of 12σ, which agrees with the theoretical expectation derived from the Planck best-fit Λ cold dark matter model. This unique nearly all-sky secondary B-mode template, which includes the lensing-induced information from intermediate to small (10 ≲ ℓ ≲ 1000) angular scales, is delivered as part of the Planck 2015 public data release. It will be particularly useful for experiments searching for primordial B-modes, such as BICEP2/Keck Array or LiteBIRD, since it will enable an estimate to be made of the lensing-induced contribution to the measured total CMB B-modes.
    Item Type: Article
    Keywords: Planck Collaboration; cosmology: observations; cosmic background radiation; polarization; gravitational lensing: weak;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 14340
    Identification Number: 10.1051/0004-6361/201527932
    Depositing User: Dr. Anthony Murphy
    Date Deposited: 13 Apr 2021 16:09
    Journal or Publication Title: Astronomy & Astrophysics
    Publisher: EDP Sciences
    Refereed: Yes
    Related URLs:
    URI: https://mural.maynoothuniversity.ie/id/eprint/14340
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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