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Planck intermediate results: XLV. Radio spectra of northern extragalactic radio sources

Citation

Ade, PAR and Aghanim, N and Aller, HD and Aller, MF and Arnaud, M and Aumont, J and Baccigalupi, C and Banday, AJ and Barreiro, RB and Bartolo, N and Battaner, E and Benabed, K and Benoit-Levy, A and Bernard, JP and Bersanelli, M and Bielewicz, P and Bonaldi, A and Bonavera, L and Bond, JR and Borrill, J and Bouchet, FR and Burigana, C and Calabrese, E and Catalano, A and Chiang, HC and Christensen, PR and Clements, DL and Colombo, LPL and Couchot, F and Crill, BP and Curto, A and Cuttaia, F and Danese, L and Davies, RD and Davis, RJ and De Bernardis, P and De Rosa, A and De Zotti, G and Delabrouille, J and Dickinson, C and Diego, JM and Dole, H and Donzelli, S and Dore, O and Ducout, A and Dupac, X and Efstathiou, G and Elsner, F and Eriksen, HK and Finelli, F and Forni, O and Frailis, M and Fraisse, AA and Franceschi, E and Galeotta, S and Galli, S and Ganga, K and Giard, M and Giraud-Heraud, Y and Gjerlow, E and Gonzalez-Nuevo, J and Gorski, KM and Gruppuso, A and Gurwell, MA and Hansen, FK and Harrison, DL and Henrot-Versille, S and Rastorgueva-Foi, EA, and others of the Planck Collaboration, Planck intermediate results: XLV. Radio spectra of northern extragalactic radio sources, Astronomy and Astrophysics, 596 Article A106. ISSN 0004-6361 (2016) [Refereed Article]


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Copyright 2016 ESO

DOI: doi:10.1051/0004-6361/201527780

Abstract

Continuum spectra covering centimetre to submillimetre wavelengths are presented for a northern sample of 104 extragalactic radio sources, mainly active galactic nuclei, based on four-epoch Planck data. The nine Planck frequencies, from 30 to 857 GHz, are complemented by a set of simultaneous ground-based radio observations between 1.1 and 37 GHz. The single-survey Planck data confirm that the flattest high-frequency radio spectral indices are close to zero, indicating that the original accelerated electron energy spectrum is much harder than commonly thought, with power-law index around 1.5 instead of the canonical 2.5. The radio spectra peak at high frequencies and exhibit a variety of shapes. For a small set of low-𝓏 sources, we find a spectral upturn at high frequencies, indicating the presence of intrinsic cold dust. Variability can generally be approximated by achromatic variations, while sources with clear signatures of evolving shocks appear to be limited to the strongest outbursts.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active, galaxies: general, radio continuum: galaxies
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Cosmology and Extragalactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Technology
UTAS Author:Rastorgueva-Foi, EA (Dr Elizaveta Rastorgueva-Foi)
ID Code:116806
Year Published:2016
Web of Science® Times Cited:8
Deposited By:Mathematics and Physics
Deposited On:2017-05-22
Last Modified:2017-10-12
Downloads:96 View Download Statistics

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