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.
Planck intermediate results: XXXI : microwave survey of Galactic supernova remnants / M. Arnaud, M. Ashdown, F. Atrio-Barandela, J. Aumont, C. Baccigalupi, A.J. Banday, R.B. Barreiro, E. Battaner, K. Benabed, A. Benoit-Lévy, J.-. Bernard, M. Bersanelli, P. Bielewicz, J. Bobin, J.R. Bond, J. Borrill, F.R. Bouchet, C.L. Brogan, C. Burigana, J.-. Cardoso, A. Catalano, A. Chamballu, H.C. Chiang, P.R. Christensen, S. Colombi, L.P.L. Colombo, B.P. Crill, A. Curto, F. Cuttaia, R.D. Davies, R.J. Davis, P. De Bernardis, A. De Rosa, G. De Zotti, J. Delabrouille, F.-. Désert, C. Dickinson, J.M. Diego, S. Donzelli, O. Doré, X. Dupac, T.A. Enßlin, H.K. Eriksen, F. Finelli, O. Forni, M. Frailis, A.A. Fraisse, E. Franceschi, S. Galeotta, K. Ganga, M. Giard, Y. Giraud-Héraud, J. González-Nuevo, K.M. Górski, A. Gregorio, A. Gruppuso, F.K. Hansen, D.L. Harrison, C. Hernández-Monteagudo, D. Herranz, S.R. Hildebrandt, M. Hobson, W.A. Holmes, K.M. Huffenberger, A.H. Jaffe, T.R. Jaffe, E. Keihänen, R. Keskitalo, T.S. Kisner, R. Kneissl, J. Knoche, M. Kunz, H. Kurki-Suonio, A. Lähteenmäki, J.-. Lamarre, A. Lasenby, C.R. Lawrence, R. Leonardi, M. Liguori, P.B. Lilje, M. Linden-Vørnle, M. López-Caniego, P.M. Lubin, D. Maino, M. Maris, D.J. Marshall, P.G. Martin, E. Martínez-González, S. Masi, S. Matarrese, P. Mazzotta, A. Melchiorri, L. Mendes, A. Mennella, M. Migliaccio, M.-. Miville-Deschênes, A. Moneti, L. Montier, G. Morgante, D. Mortlock, D. Munshi, J.A. Murphy, P. Naselsky, F. Nati, F. Noviello, D. Novikov, I. Novikov, N. Oppermann, C.A. Oxborrow, L. Pagano, F. Pajot, R. Paladini, F. Pasian, M. Peel, O. Perdereau, F. Perrotta, F. Piacentini, M. Piat, D. Pietrobon, S. Plaszczynski, E. Pointecouteau, G. Polenta, L. Popa, G.W. Pratt, J.-. Puget, J.P. Rachen, W.T. Reach, W. Reich, M. Reinecke, M. Remazeilles, C. Renault, J. Rho, S. Ricciardi, T. Riller, I. Ristorcelli, G. Rocha, C. Rosset, G. Roudier, B. Rusholme, M. Sandri, G. Savini, D. Scott, V. Stolyarov, D. Sutton, A.-. Suur-Uski, J.-. Sygnet, J.A. Tauber, L. Terenzi, L. Toffolatti, M. Tomasi, M. Tristram, M. Tucci, G. Umana, L. Valenziano, J. Valiviita, B. Van Tent, P. Vielva, F. Villa, L.A. Wade, D. Yvon, A. Zacchei, A. Zonca. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 586(2016), pp. A134.1-A134.21.
Planck intermediate results: XXXI : microwave survey of Galactic supernova remnants
M. BersanelliPrimo
;L.P.L. Colombo;D. MainoSecondo
;A. MennellaPenultimo
;M. TomasiUltimo
;
2016
Abstract
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.
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