Preprint Article Version 1 NOT YET PEER-REVIEWED

# The radio/gamma-ray connection from 120 MHz to 230 GHz

1. INAF Istituto di Radioastronomia, via Gobetti 101, I-40129, Bologna, Italy
2. Dipartimento di Fisica e Astronomia, Università di Bologna, via Ranzani 1, 40127, Bologna, Italy
Version 1 : Received: 14 July 2016 / Approved: 14 July 2016 / Online: 14 July 2016 (12:11:50 CEST)

A peer-reviewed article of this Preprint also exists.

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

Journal reference: Galaxies 2016, 4, 30
DOI: 10.3390/galaxies4030030

## Abstract

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 frequency. Taking as a reference the strong and very highly significant correlation found between gamma rays and cm-$\lambda$ radio emission, we explore 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 radiation emission. 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-$\lambda$ data taken by ALMA.

## Subject Areas

BL Lacertae objects: general, catalogues, gamma rays: galaxies, quasars: general, radiation mechanisms: non-thermal, radio continuum: galaxies