# Comparison of SEDs of very massive radio-loud and radio-quiet AGN

## TL;DR

This study compares the spectral energy distributions of very massive radio-loud and radio-quiet AGN, revealing differences in radio loudness, X-ray loudness, and the dominance of IR and X-ray components, with implications for AGN structure.

## Contribution

It provides a detailed comparison of SED components in massive AGN, confirming bimodal radio loudness and similar X-ray loudness across AGN types, with new insights into their spectral characteristics.

## Key findings

- Radio loudness distribution is bimodal.
- Radio galaxies are about twice as X-ray loud as RQ AGN.
- X-ray loudness is similar for Type 1 and Type 2 AGN.

## Abstract

The main objective of this work is to establish and interpret the dominant spectral components and their differences in radio-loud (RL) and radio-quiet (RQ) AGN with very massive black holes, and accreting at moderate rates. Such a sample is selected from the \textit{Swift}/BAT catalogue of AGN having determined optical spectra types and hosting black holes with masses $\rm > 10^{8.5}\,M_{\odot}$. We confirm our previous results, that radio loudness distribution of \textit{Swift}/BAT AGN is bimodal and that radio galaxies are about two times X-ray louder than their radio-quiet counterparts. We show that the average X-ray loudness (defined as a ratio of luminosity in the $14-195$ keV band to that at 12 $\mu$m) of Type 1 and Type 2 AGN is very similar. This similarity holds for both RL and RQ subsamples and indicates negligible dependence of the observed X-ray luminosities on the inclination angle in both populations. In both the radiative output is dominated by mid-IR and hard X-ray components, and relatively weak UV luminosities indicate large amounts of dust in polar regions.