A1 Refereed original research article in a scientific journal
Planck early results. XV. Spectral energy distributions and radio continuum spectra of northern extragalactic radio sources
Authors: Aatrokoski J, Ade PAR, Aghanim N, Aller HD, Aller MF, Angelakis E, Arnaud M, Ashdown M, Aumont J, Baccigalupi C, Balbi A, Banday AJ, Barreiro RB, Bartlett JG, Battaner E, Benabed K, Benoit A, Berdyugin A, Bernard JP, Bersanelli M, Bhatia R, Bonaldi A, Bonavera L, Bond JR, Borrill J, Bouchet FR, Bucher M, Burigana C, Burrows DN, Cabella P, Capalbi M, Cappellini B, Cardoso JF, Catalano A, Cavazzuti E, Cayon L, Challinor A, Chamballu A, Chary RR, Chiang LY, Christensen PR, Clements DL, Colafrancesco S, Colombi S, Couchot F, Coulais A, Cutini S, Cuttaia F, Danese L, Davies RD, Davis RJ, de Bernardis P, de Gasperis G, de Rosa A, de Zotti G, Delabrouille J, Delouis JM, Dickinson C, Dole H, Donzelli S, Dore O, Dorl U, Douspis M, Dupac X, Efstathiou G, Ensslin TA, Finelli F, Forni O, Frailis M, Franceschi E, Fuhrmann L, Galeotta S, Ganga K, Gargano F, Gasparrini D, Gehrels N, Giard M, Giardino G, Giglietto N, Giommi P, Giordano F, Giraud-Heraud Y, Gonzalez-Nuevo J, Gorski KM, Gratton S, Gregorio A, Gruppuso A, Harrison D, Henrot-Versille S, Herranz D, Hildebrandt SR, Hivon E, Hobson M, Holmes WA, Hovest W, Hoyland RJ, Huffenberger KM, Jaffe AH, Juvela M, Keihanen E, Keskitalo R, King O, Kisner TS, Kneissl R, Knox L, Krichbaum TP, Kurki-Suonio H, Lagache G, Lahteenmaki A, Lamarre JM, Lasenby A, Laureijs RJ, Lavonen N, Lawrence CR, Leach S, Leonardi R, Leon-Tavares J, Linden-Vornle M, Lindfors E, Lopez-Caniego M, Lubin PM, Macias-Perez JF, Maffei B, Maino D, Mandolesi N, Mann R, Maris M, Martinez-Gonzalez E, Masi S, Massardi M, Matarrese S, Matthai F, Max-Moerbeck W, Mazziotta MN, Mazzotta P, Melchiorri A, Mendes L, Mennella A, Michelson PF, Mingaliev M, Mitra S, Miville-Deschenes MA, Moneti A, Monte C, Montier L, Morgante G, Mortlock D, Munshi D, Murphy A, Naselsky P, Natoli P, Nestoras I, Netterfield CB, Nieppola E, Nilsson K, Norgaard-Nielsen HU, Noviello F, Novikov D, Novikov I, O'Dwyer IJ, Osborne S, Pajot F, Partridge B, Pasian F, Patanchon G, Pavlidou V, Pearson TJ, Perdereau O, Perotto L, Perri M, Perrotta F, Piacentini F, Piat M, Plaszczynski S, Platania P, Pointecouteau E, Polenta G, Ponthieu N, Poutanen T, Prezeau G, Procopio P, Prunet S, Puget JL, Rachen JP, Raino S, Reach WT, Readhead A, Rebolo R, Reeves R, Reinecke M, Reinthal R, Renault C, Ricciardi S, Richards J, Riller T, Riquelme D, Ristorcelli I, Rocha G, Rosset C, Rowan-Robinson M, Rubino-Martin JA, Rusholme B, Saarinen J, Sandri M, Savolainen P, Scott D, Seiffert MD, Sievers A, Sillanpaa A, Smoot GF, Sotnikova Y, Starck JL, Stevenson M, Stivoli F, Stolyarov V, Sudiwala R, Sygnet JF, Takalo L, Tammi J, Tauber JA, Terenzi L, Thompson DJ, Toffolatti L, Tomasi M, Tornikoski M, Torre JP, Tosti G, Tramacere A, Tristram M, Tuovinen J, Turler M, Turunen M, Umana G, Ungerechts H, Valenziano L, Valtaoja E, Varis J, Verrecchia F, Vielva P, Villa F, Vittorio N, Wandelt BD, Wu J, Yvon D, Zacchei A, Zensus JA, Zhou X, Zonca A
Publisher: EDP SCIENCES S A
Publication year: 2011
Journal:Astronomy and Astrophysics
Journal name in sourceASTRONOMY & ASTROPHYSICS
Journal acronym: ASTRON ASTROPHYS
Article number: ARTN A15
Volume: 536
Number of pages: 56
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/201116466
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.
