Feedback from low-luminosity radio galaxies: B2 0258+35
  Low-luminosity radio-loud active galactic nuclei (AGN) are of importance in
studies concerning feedback from radio AGN since a dominant fraction of AGN
belong to this class. We report high-resolution Very Large Array (VLA) and
European VLBI Network (EVN) observations of HI-21cm absorption from a young,
compact steep-spectrum radio source, B2 0258+35, nested in the early-type
galaxy NGC 1167, which contains a 160 kpc HI disc. Our VLA and EVN HI
absorption observations, modelling, and comparison with molecular gas data
suggest that the cold gas in the centre of NGC 1167 is very turbulent (with a
velocity dispersion of ~ 90 km/s) and that this turbulence is induced by the
interaction of the jets with the interstellar medium (ISM). Furthermore, the
ionised gas in the galaxy shows evidence of shock heating at a few kpc from the
radio source. These findings support the results from numerical simulations of
radio jets expanding into a clumpy gas disc, which predict that the radio jets
in this case percolate through the gas disc and drive shocks into the ISM at
distances much larger than their physical extent. These results expand the
number of low-luminosity radio sources found to impact the surrounding medium,
thereby highlighting the possible relevance of these AGN for feedback.
