Liners as Low-Luminosity Active Galactic Nuclei 2.7. Comparing SEDs of AGNs of various luminosities might yield clues to physical processes that depend on luminosity.
Several features are noteworthy.
The optical-UV slope is quite steep. There is tentative evidence for a maximum in the SED at mid-IR wavelengths. The nuclei have radio spectra that are either flat or inverted. All sources, including the three spiral galaxies in the sample, qualify as being radio-loud . This finding runs counter to the usual notion that only elliptical galaxies host radio-loud AGNs.