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Galaxies 2016, 4(4), 49; doi:10.3390/galaxies4040049

Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era

Aalto University Metsähovi Radio Observatory & Department of Radio Science and Engineering, P.O. Box 13000, FI-00076 AALTO, Finland
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Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Received: 5 July 2016 / Revised: 18 October 2016 / Accepted: 19 October 2016 / Published: 21 October 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
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Abstract

The multi-epoch single-survey Planck satellite data have given a rare glimpse into how the radio spectra of active galactic nuclei (AGN) evolve in time. Using Planck and simultaneous auxiliary radio data ranging from 1 GHz to 857 GHz, spectra for 104 bright northern extragalactic radio sources (most of them AGN) have been assembled; in these, the various stages of flare development can be identified. The results are compared with theoretical models describing relativistic jets. Evidence for particularly flat high-frequency radio spectra is found, indicating a harder accelerated electron energy spectrum than usually assumed. A set of sources also shows signs of intrinsic cold dust. View Full-Text
Keywords: active galactic nuclei; radio spectra; relativistic jets active galactic nuclei; radio spectra; relativistic jets
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lähteenmäki, A.; the Planck Collaboration. Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era. Galaxies 2016, 4, 49.

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