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We present the first multi-frequency VLBI images of PKS 2254-367, aGiga-hertz Peaked Spectrum (GPS) radio source hosted by the nearby galaxy IC1459 (D=20.5 Mpc). PKS 2254-367 and the radio source in NGC 1052 (PKS 0238-084;D=17.2 Mpc) are the two closest GPS radio sources to us, far closer than thenext closest example, PKS 1718-649 (D=59 Mpc). As such, IC 1459 and NGC 1052offer opportunities to study the details of the pc-scale radio sources as wellas the environments that the radio sources inhabit, across the electromagneticspectrum. Given that some models for the origin and evolution of GPS radiosources require a strong connection between the radio source morphology and thegaseous nuclear environment, such opportunities for detailed study areimportant. Our VLBI images of PKS 2254-367 show that the previously identifiedsimilarities between IC 1459 and NGC 1052 continue onto the pc-scale. Bothcompact radio sources appear to have symmetric jets of approximately the sameluminosity, much lower than typically noted in compact double GPS sources.Similarities between PKS 2254-367 and NGC 1052, and differences with respect toother GPS galaxies, lead us to speculate that a sub-class of GPS radio sources,with low luminosity and with jet-dominated morphologies, exists and would belargely absent from radio source surveys with ~1 Jy flux density cutoffs. Wesuggest that this possible low-luminosity, jet-dominated population of GPSsources could be an analog of the FR-I radio galaxies, with the higherluminosity lobe-dominated GPS sources being the analog of the FR-II radiogalaxies.

monthly notices of the royal astronomical society

The multi-frequency parsec-scale structure of PKS 2254-367 (IC 1459): a  luminosity-dependent break in morphology for the precursors of radio  galaxies?