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We cross-matched the 6-year Swift/Burst Alert Telescope (BAT) survey ofactive galactic nuclei (AGN) with the AT20G radio survey of the southern sky,which is one of the largest high-frequency radio surveys available. With thesedata we investigated the possible correlation between the radio and the X-rayemission at the highest radio and X-ray frequencies. We found 37 AGN with ahigh probability of association (>80 per cent), among which 19 are localSeyfert galaxies (with median redshift z = 0.03) and 18 blazars. We found that\approx 20 per cent of the AGN detected in hard X-rays are also bright radiosources at 20 GHz, but the apparent correlation between the radio and hardX-ray luminosity is completely driven by the different median redshifts of thetwo subgroups of AGN. When we consider only the local Seyfert sample we find noevidence of a correlation between their 20 GHz and 15-55 keV power. Thereforeit appears that at high frequencies the radio-X connection, which had beenpreviously observed at lower frequencies, disappears. The disappearance of theradio-X correlation at high radio and X-ray frequencies could be tested throughVery Long Baseline Interferometry and the use of the Nuclear SpectroscopicTelescope Array (NuSTAR) satellite.

The AT20G view of Swift/BAT selected AGN: high-frequency radio waves meet hard X-rays