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      The nature of compact radio sources: the case of FR 0 radio galaxies

      The Astronomy and Astrophysics Review
      Springer Science and Business Media LLC

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          Abstract

          Radio-loud compact radio sources (CRSs) are characterised by morphological compactness of the jet structure centred on the active nucleus of the galaxy. Most of the local elliptical galaxies are found to host a CRS with nuclear luminosities lower than those of typical quasars, \[\lesssim 10^{42}\, \text{erg}\, \text{s}^{-1}\] . Recently, low-luminosity CRSs with a LINER-like optical spectrum have been named Fanaroff–Riley (FR) type 0 to highlight their lack of substantially extended radio emission at kpc scales, in contrast with the other Fanaroff–Riley classes, full-fledged FR Is and FR II radio galaxies. FR 0s are the most abundant class of radio galaxies in the local Universe, and characterised by a higher core dominance, poorer Mpc-scale environment and smaller (sub-kpc scale, if resolved) jets than FR Is. However, FR 0s share similar host and nuclear properties with FR Is. A different accretion–ejection paradigm from that in place in FR Is is invoked to account for the parsec-scale FR 0 jets. This review revises the state-of-the-art knowledge about FR 0s, their nature, and which open issues the next generation of radio telescopes can solve in this context.

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              Color Separation of Galaxy Types in the Sloan Digital Sky Survey Imaging Data

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                Author and article information

                Contributors
                (View ORCID Profile)
                Journal
                The Astronomy and Astrophysics Review
                Astron Astrophys Rev
                Springer Science and Business Media LLC
                0935-4956
                1432-0754
                December 2023
                August 30 2023
                December 2023
                : 31
                : 1
                Article
                10.1007/s00159-023-00148-3
                e18d90ab-5125-4701-9d70-f1a542c77152
                © 2023

                https://creativecommons.org/licenses/by/4.0

                https://creativecommons.org/licenses/by/4.0

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