Planck early results. XV. Spectral energy distributions and radio continuum spectra of northern extragalactic radio sources

Aatrokoski, J. and Ade, P.A.R. and Aghanim, N. and Aller, H.D. and Aller, M.F. and Angelakis, E. and Arnaud, M. and Ashdown, M. and Aumont, J. and Baccigalupi, C. and Balbi, A. and Banday, A.J. and Barreiro, R.B. and Bartlett, J.G. and Battaner, E. and Benabed, K. and Benoit, A. and Berdyugin, A. and Bernard, J.-P. and Bersanelli, M. and Bhatia, R. and Bonaldi, A. and Bonavera, L. and Bond, J.R. and Borrill, J. and Bouchet, F.R. and Bucher, M. and Burigana, C. and Burrows, D.N. and Cabella, P. and Capalbi, B. and Cappellini, B. and Cardoso, J.-F. and Catalano, A. and Cavazzuti, E. and Cayon, L. and Challinor, A. and Chamballu, A. and Chary, R.-R. and Chiang, L.-Y. and Christensen, P.R. and Clements, D.L. and Colafrancesco, S. and Colombi, S. and Couchot, F. and Coulais, A. and Cutini, S. and Cuttaia, F. and Danese, L. and Davies, R.D. and Davis, R.J. and De Bernardis, P. and de Gasperis, G. and de Rosa, A. and de Zotti, G. and Delabrouille, J. and Delouis, J.-M. and Dickinson, C. and Dole, H. and Donzelli, S. and Dore, O. and Dorl, U. and Douspis, M. and Dupac, X. and Efstathiou, G. and Enßlin, T.A. and Finelli, F. and Forni, O. and Frailis, M. and Franceschi, E. and Fuhrmann, L. and Galeotta, S. and Ganga, K. and Gargano, K. and Gasparrini, D. and Gehrels, N. and Giard, M. and Giardino, G. and Giglietto, N. and Giommi, P. and Giordano, F. and Giraud-Héraud, Y. and Gonzalez-Nuevo, J. and Gorski, K.M. and Gratton, S. and Gregorio, A. and Grupposo, A. and Harrison, D. and Henrot-Versille, S. and Herranz, D. and Hildebrandt, S.R. and Hivon, E. and Hobson, M. and Holmes, W.A. and Hovest, W. and Hoyland, R.J. and Huffenberger, K.M. and Jaffe, A.H. and Juvela, M. and Keihanen, E. and Keskitalo, R. and King, O. and Kisner, T.S. and Kneissl, R. and Knox, L. and Krichbaum, T.P. and Kurki-Suonio, H. and Lagache, G. and Lahteenmaki, A. and Lamarre, J.-M. and Lasenby, A. and Laureijs, R.J. and Lavonen, N. and Lawrence, C.R. and Leach, S. and Leonardi, R. and Leon-Tavares, J. and Linden-Vornle, M. and Lindfors, E. and Lopez-Caniego, M. and Lubin, P.M. and Macias-Perez, J.F. and Maffei, B. and Maino, D. and Mandolesi, N. and Mann, R. and Maris, M. and Martinez-Gonzalez, E. and Masi, S. and Massardi, M. and Matarrese, S. and Matthai, F. and Max-Moerbeck, W. and Mazziotta, M.N. and Mazzotta, P. and Melchiorri, A. and Mendes, L. and Mennella, A. and Michelson, P.F. and Mingaliev, M. and Mitra, S. and Miville-Deschenes, M.-A. and Moneti, A. and Monte, C. and Montier, L. and Morgante, G. and Mortlock, D. and Munshi, D. and Murphy, A. and Naselsky, P. and Natoli, P. and Nestoras, I. and Netterfield, C.B. and Nieppola, K. and Nilsson, K. and Norgaard-Nielsen, H.U. and Noviello, F. and Novikov, D. and Novikov, I. and O'Dwyer, S. and Osborne, S. and Pajot, F. and Partridge, B. and Pasian, F. and Patanchon, G. and Pavlidou, V. and Pearson, T.J. and Perdereau, O. and Perotto, L. and Perri, M. and Perotta, L. and Piacentini, F. and Piat, M. and Plaszczynski, S. and Platania, P. and Pointecouteau, E. and Polenta, G. and Ponthieu, N. and Poutanen, T. and Prezeau, G. and Procopio, P. and Prunet, S. and Puget, J.-L. and Rachen, J.P. and Raino, S. and Reach, W.T. and Readhead, A. and Rebolo, R. and Reeves, R. and Reinecke, M. and Reinthal, R. and Renault, C. and Ricciardi, S. and Richards, J. and Riller, T. and Riquelme, D. and Ristorcelli, I. and Rocha, G. and Rosset, C. and Rowan-Robinson, M. and Rubino-Martin, J.A. and Rusholme, B. and Saarinen, J. and Sandri, M. and Savolainen, P. and Scott, D. and Seiffert, M.D. and Sievers, A. and Sillanpaa, A. and Smoot, G.F. and Sotnikova, Y. and Starck, J.-L. and Stevenson, M. and Stivoli, F. and Stolyarov, V. and Sudiwala, R. and Sygnet, J.-F. and Takalo, L. and Tammil, J. and Tauber, J.A. and Terenzi, L. and Thompson, D.J. and Toffolatti, L. and Tomasi, M. and Tornikoski, M. and Torre, J.-P. and Tosti, A. and Tramacere, M. and Tristram, M. and Tuovinen, J. and Turler, M. and Turunen, M. and Umana, G. and Ungerechts, H. and Valenziano, L. and Valtaoja, E. and Varis, J. and Verrecchia, F. and Vielva, P. and Villa, F. and Vittorio, N. and Wandelt, B.D. and Wu, J. and Yvon, D. and Zacchei, A. and Zensus, J.A. and Zhou, X. and Zonca, A. (2011) Planck early results. XV. Spectral energy distributions and radio continuum spectra of northern extragalactic radio sources. Astronomy & Astrophysics, 536 (A15). pp. 1-56. ISSN 0004-6361

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Spectral energy distributions (SEDs) and radio continuum spectra are presented for a northern sample of 104 extragalactic radio sources, based on the Planck Early Release Compact Source Catalogue (ERCSC) and simultaneous multifrequency data. The nine Planck frequencies, from 30 to 857 GHz, are complemented by a set of simultaneous observations ranging from radio to gamma-rays. This is the first extensive frequency coverage in the radio and millimetre domains for an essentially complete sample of extragalactic radio sources, and it shows how the individual shocks, each in their own phase of development, shape the radio spectra as they move in the relativistic jet. The SEDs presented in this paper were fitted with second and third degree polynomials to estimate the frequencies of the synchrotron and inverse Compton (IC) peaks, and the spectral indices of low and high frequency radio data, including the Planck ERCSC data, were calculated. SED modelling methods are discussed, with an emphasis on proper, physical modelling of the synchrotron bump using multiple components. Planck ERCSC data also suggest that the original accelerated electron energy spectrum could be much harder than commonly thought, with power-law index around 1.5 instead of the canonical 2.5. The implications of this are discussed for the acceleration mechanisms effective in blazar shocks. Furthermore in many cases the Planck data indicate that gamma-ray emission must originate in the same shocks that produce the radio emission.

Item Type: Article
Additional Information: © ESO 2011 The original publication is available at DOI: 10.1051/0004-6361/201116466
Keywords: galaxies; active BL Lacertae objects; quasars; radiation mechanisms; non-thermal; Planck Collaboration;
Academic Unit: Faculty of Science and Engineering > Experimental Physics
Item ID: 4061
Depositing User: Dr. Anthony Murphy
Date Deposited: 10 Apr 2013 10:51
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
Refereed: Yes

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