On the sub-parsec scale core composition of FR 0 radio galaxies
Margot Boughelilba, Anita Reimer
TL;DR
FR 0 radio galaxies, the most common jet population in the local universe, have nuclear properties similar to FR I galaxies but lack extended radio emission, and their broadband spectra can be explained by a lepto-hadronic jet model.
Contribution
This study compares the spectral energy distribution of FR 0s with FR Is, especially M87, and applies a lepto-hadronic jet-accretion flow model to explain their broadband emission.
Findings
FR 0s have broadband spectra close to M87's quiet core.
The lepto-hadronic model explains FR 0s' spectra with parameters near particle-field equipartition.
FR 0s are multi-messenger jet sources with highly magnetized environments.
Abstract
Although Fanaroff-Riley (FR) type 0 radio galaxies are known to be the most numerous jet population in the local Universe, they are much less explored than the well-established class of FR I and FR II galaxies due to their intrinsic weakness. Observationally, their nuclear radio, optical and X-ray properties are comparable to the nuclear environment of FR Is. The recent detection of two FR 0s in the high-energy band suggests that like in FR Is, charged particles are accelerated there to energies that enable gamma-ray production. Up to now, only the lack of extended radio emission from FR 0s distinguishes them from FR Is. By comparing the spectral energy distribution of FR 0s with that of FR Is and in particular with that of M87 as a well-studied reference source of the FR I population, we find the broadband spectrum of FR 0s exceptionally close to M87's quiet core emission. Relying on…
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