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Schellenberger et al. have constructed the radio/sub-mm spectral
energy distribution (SED) of the galaxy NGC 5044 over more than three
orders of magnitude, drawing on archival ATCA data amongst other
sources.
They interpret the low frequency emission, with the peak around 1 GHz,
as emission from the jets/lobes that are still powered by the central
AGN, to which they fit a Continous Injection Model and an optically
thick self absorption component at the lower frequencies. The high
frequency component comes from the core of the galaxy, so it is likely
to be emission from the AGN itself powered by the accretion of matter
around the central supermassive black hole. This
emission is modeled by an Advection Dominated Accretion Flow,
consisting of a rising part from synchrotron cooling, and a falling
part in the sub-mm regime from Compton cooling processes.
In the image above the green and orange data-points
illustrate the flux from the jets and core, respectively. The
dotted green line corresponds to a CI model with self absorption at the low
frequency end. The dashed orange line is emission from advection dominated accretion.
The paper will be published in the Astrophysical Journal.
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