Description
AGN activity is often revealed by strong X-ray and radio emission, even when the AGN is obscured at other wavelengths. Some AGN have been observed to be radio bright but X-ray faint, others X-ray bright but radio faint, as well as bright or faint/unobserved in both X-ray and radio. What determines whether the AGN will be X-ray or radio bright? Is it due to one mechanism that determines both, or two mechanisms in isolation, or even some mixture of the two?
We use X-ray and radio data from fields (Bootes, COSMOS) that have been well observed, with large catalogues of multi-wavelength photometry and spectroscopy, to compare sources that that are X-ray and/or radio observed. We find that while X-ray and radio luminosities have a tendency to increase with redshift, we do not find any pattern between X-ray and radio luminosity at any given redshift. We also plot radio and X-ray luminosity functions for the radio and X-ray samples as a whole and compare them to the subset that is both X-ray and radio observed and find that there is a broad range of X-ray luminosity for a given radio luminosity range, and vice versa. This would imply that the instantaneous X-ray power, often a tracer of accretion, is not correlated with the radio power. However, there is an increase in the fraction of radio detected sources for sources with a more luminous X-ray detection, and vice versa, indicating a complex link between the X-ray emitting corona and the radio jet.
