Planck intermediate results. XLVIII. Disentangling Galactic dust emission and cosmic infrared background anisotropies

Aghanim, N. and Ashdown, M. and Aumont, J. and Baccigalupi, C. and Ballardini, M. and Banday, A.J. and Barreiro, R.B. and Bartolo, N. and Basak, S. and Benabed, K. and Bernard, J.-P. and Bersanelli, M. and Bielewicz, P. and Bonavera, L. and Bond, J.R. and Borrill, J. and Bouchet, F.R. and Boulanger, F. and Burigana, C. and Calabrese, E. and Cardoso, J.-F. and Carron, J. and Chiang, H.C. and Colombo, L.P.L. and Comis, B. and Couchot, F. and Coulais, A. and Crill, B.P. and Curto, A. and Cuttaia, F. and de Bernardis, P. and de Zotti, G. and Delabrouille, J. and Di Valentino, E. and Dickinson, C. and Diego, J.M. and Doré, O. and Douspis, M. and Ducout, A. and Dupac, X. and Dusini, S. and Elsner, F. and Enßlin, T.A. and Eriksen, H.K. and Falgarone, E. and Fantaye, Y. and Finelli, F. and Forastieri, F. and Frailis, M. and Fraisse, A.A. and Franceschi, E. and Frolov, A. and Galeotta, S. and Galli, S. and Ganga, K. and Génova-Santos, R.T. and Gerbino, M. and Ghosh, T. and Giraud-Héraud, Y. and González-Nuevo, J. and Górski, K.M. and Gruppuso, A. and Gudmundsson, J.E. and Hansen, F.K. and Helou, G. and Henrot-Versillé, S. and Herranz, D. and Hivon, E. and Huang, Z. and Jaffe, A.H. and Jones, W.C. and Keihänen, E. and Keskitalo, R. and Kiiveri, K. and Kisner, T.S. and Krachmalnicoff, N. and Kunz, M. and Kurki-Suonio, H. and Lamarre, J.-M. and Langer, M. and Lasenby, A. and Lattanzi, M. and Lawrence, C.R. and Le Jeune, M. and Levrier, F. and Lilje, P.B. and Lilley, M. and Lindholm, V. and López-Caniego, M. and Ma, Y.-Z. and Macías-Pérez, J.F. and Maggio, G. and Maino, D. and Mandolesi, N. and Mangilli, A. and Maris, M. and Martin, P.G. and Martínez-González, E. and Matarrese, S. and Mauri, N. and McEwen, J.D. and Melchiorri, A. and Mennella, A. and Migliaccio, M. and Miville-Deschênes, M.-A. and Molinari, D. and Moneti, A. and Montier, L. and Morgante, G. and Moss, A. and Natoli, P. and Oxborrow, C.A. and Pagano, L. and Paoletti, D. and Patanchon, G. and Perdereau, O. and Perotto, L. and Pettorino, V. and Piacentini, F. and Plaszczynski, S. and Polastri, L. and Polenta, G. and Puget, J.-L. and Rachen, J.P. and Racine, B. and Reinecke, M. and Remazeilles, M. and Renzi, A. and Rocha, G. and Rosset, C. and Rossetti, M. and Roudier, G. and Rubiño-Martín, J.A. and Ruiz-Granados, B. and Salvati, L. and Sandri, M. and Savelainen, M. and Scott, D. and Sirignano, C. and Sirri, G. and Soler, J.D. and Spencer, L.D. and Suur-Uski, A.-S. and Tauber, J.A. and Tavagnacco, D. and Tenti, M. and Toffolatti, L. and Tomasi, M. and Tristram, M. and Trombetti, T. and Valiviita, J. and Van Tent, F. and Vielva, P. and Villa, F. and Vittorio, N. and Wandelt, B.D. and Wehus, I.K. and Zacchei, A. and Zonca, A. (2016) Planck intermediate results. XLVIII. Disentangling Galactic dust emission and cosmic infrared background anisotropies. Astronomy & Astrophysics, 596 . A109/1-A109/26. ISSN 1432-0746

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Using the Planck 2015 data release (PR2) temperature maps, we separate Galactic thermal dust emission from cosmic infrared background (CIB) anisotropies. For this purpose, we implement a specifically tailored component-separation method, the so-called generalized needlet internal linear combination (GNILC) method, which uses spatial information (the angular powerspectra) to disentangle the Galactic dust emission and CIB anisotropies. We produce significantly improved all-sky maps of Planck thermal dust emission, with reduced CIB contamination, at 353, 545, and 857 GHz. By reducing the CIB contamination of the thermal dust maps, we provide more accurate estimates of the local dust temperature and dust spectral index over the sky with reduced dispersion, especially at high Galactic latitudes above b = ±20°. We find that the dust temperature is T = (19.4 ± 1.3) K and the dust spectral index is β = 1.6 ± 0.1 averaged over the whole sky, while T = (19.4 ± 1.5) K and β = 1.6 ± 0.2 on 21% of the sky at high latitudes. Moreover, subtracting the new CIB-removed thermal dust maps from the CMB-removed Planck maps gives access to the CIB anisotropies over 60% of the sky at Galactic latitudes |b| > 20°. Because they are a significant improvement over previous Planck products, the GNILC maps are recommended for thermal dust science. The new CIB maps can be regarded as indirect tracers of the dark matter and they are recommended for exploring cross-correlations with lensing and large-scale structure optical surveys. The reconstructed GNILC thermal dust and CIB maps are delivered as Planck products.

Item Type: Article
Additional Information: © ESO, 2016
Keywords: cosmology: observations; methods: data analysis; ISM: general; dust, extinction; infrared: diffuse background; large-scale structure of Universe
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1051/0004-6361/201629022
Depositing User: Eprints, Support
Date Deposited: 02 May 2017 11:37
Last Modified: 02 May 2017 19:51

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