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Galaxies 2016, 4(3), 30; doi:10.3390/galaxies4030030

The Radio/Gamma-Ray Connection from 120 MHz to 230 GHz

INAF Istituto di Radioastronomia, via Gobetti 101, Bologna I-40129, Italy
Dipartimento di Fisica e Astronomia, Università di Bologna, via Ranzani 1, Bologna 40127, Italy
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Received: 14 July 2016 / Revised: 3 September 2016 / Accepted: 5 September 2016 / Published: 13 September 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
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Radio loud active galactic nuclei are composed of different spatial features, each one characterized by different spectral properties in the radio band. Among them, blazars are the most common class of sources detected at gamma-rays by Fermi, and their radio emission is dominated by the flat spectrum compact core. In this contribution, we explore the connection between emission at high energy revealed by Fermi and at radio frequencies. Taking as a reference the strong and very highly significant correlation found between gamma rays and cm-λ radio emission, we explore the different behaviours found as we change the energy range in gamma rays and in radio, therefore changing the physical parameters of the zones involved in the emitted radiation. We find that the correlation weakens when we consider (1) gamma rays of energy above 10 GeV (except for high synchrotron peaked blazars) or (2) low frequency radio data taken by the Murchison Widefield Array; on the other hand, the correlation strengthens when we consider mm-λ data taken by Atacama Large Millimeter Array (ALMA). View Full-Text
Keywords: BL Lacertae objects: general; catalogues; gamma rays: galaxies; quasars: general; radiation mechanisms: non-thermal; radio continuum: galaxies BL Lacertae objects: general; catalogues; gamma rays: galaxies; quasars: general; radiation mechanisms: non-thermal; radio continuum: galaxies

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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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Giroletti, M.; D’Ammando, F.; Orienti, M.; Lico, R.; The <i>Fermi</i>-LAT Collaboration. The Radio/Gamma-Ray Connection from 120 MHz to 230 GHz. Galaxies 2016, 4, 30.

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