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  • Planck intermediate results
    Ashdown, M.; Atrio-Barandela, F.; Aumont, J.; Baccigalupi, C.; Banday, A. J.; Benabed, K.; Benoit-Lévy, A.; Bersanelli, M.; Bielewicz, P.; Bobin, J.; Bond, J. R.; Bouchet, F. R.; Cardoso, J.-F.; Catalano, A.; Chamballu, A.; Chiang, H. C.; Colombi, S.; Colombo, L. P. L.; Crill, B. P.; Davies, R. D.; Davis, R. J.; de Bernardis, P.; Désert, F.-X.; Diego, J. M.; Donzelli, S.; Doré, O.; Enßlin, T. A.; Finelli, F.; Forni, O.; Frailis, M.; Fraisse, A. A.; Galeotta, S.; Giard, M.; Giraud-Héraud, Y.; González-Nuevo, J.; Gruppuso, A.; Hernández-Monteagudo, C.; Herranz, D.; Huffenberger, K. M.; Jaffe, A. H.; Keskitalo, R.; Kneissl, R.; Knoche, J.; Kurki-Suonio, H.; Lähteenmäki, A.; Lamarre, J.-M.; Lasenby, A.; Lawrence, C. R.; Leonardi, R.; Lilje, P. B.; Linden-Vørnle, M.; Lubin, P. M.; Maino, D.; Maris, M.; Marshall, D. J.; Martin, P. G.; Martínez-González, E.; Masi, S.; Mennella, A.; Migliaccio, M.; Miville-Deschênes, M.-A.; Moneti, A.; Mortlock, D.; Munshi, D.; Murphy, J. A.; Novikov, I.; Oxborrow, C. A.; Pagano, L.; Pajot, F.; Paladini, R.; Pasian, F.; Perrotta, F.; Piacentini, F.; Pietrobon, D.; Plaszczynski, S.; Pointecouteau, E.; Popa, L.; Pratt, G. W.; Rachen, J. P.; Reach, W. T.; Reich, W.; Remazeilles, M.; Renault, C.; Ricciardi, S.; Rocha, G.; Rusholme, B.; Scott, D.; Stolyarov, V.; Sutton, D.; Suur-Uski, A.-S.; Tauber, J. A.; Terenzi, L.; Tomasi, M.; Tucci, M.; Umana, G.; Valenziano, L.; Vielva, P.; Yvon, D.; Zacchei, A.; Zonca, A.

    Astronomy and astrophysics (Berlin), 02/2016, Letnik: 586
    Journal Article

    The all-sky Planck survey in 9 frequency bands was used to search for emission from all 274 known Galactic supernova remnants. Of these, 16 were detected in at least two Planck frequencies. The radio-through-microwave spectral energy distributions were compiled to determine the mechanism for microwave emission. In only one case, IC 443, is there high-frequency emission clearly from dust associated with the supernova remnant. In all cases, the low-frequency emission is from synchrotron radiation. As predicted for a population of relativistic particles with energy distribution that extends continuously to high energies, a single power law is evident for many sources, including the Crab and PKS 1209-51/52. A decrease in flux density relative to the extrapolation of radio emission is evident in several sources. Their spectral energy distributions can be approximated as broken power laws, Sν ∝ ν−α, with the spectral index, α, increasing by 0.5–1 above a break frequency in the range 10–60 GHz. The break could be due to synchrotron losses. Reproduced with permission from Astronomy & Astrophysics, © ESO 2016