The jet/wind outflow in Centaurus A: a local laboratory for AGN feedback
  We present new radio and optical images of the nearest radio galaxy Centaurus
A and its host galaxy NGC 5128. We focus our investigation on the northern
transition region, where energy is transported from the ~5 kpc (~5 arcmin)
scales of the Northern Inner Lobe (NIL) to the ~30 kpc (~30 arcmin) scales of
the Northern Middle Lobe (NML). Our Murchison Widefield Array observations at
154 MHz and our Parkes radio telescope observations at 2.3 GHz show diffuse
radio emission connecting the NIL to the NML, in agreement with previous
Australia Telescope Compact Array observations at 1.4 GHz. Comparison of these
radio data with our widefield optical emission line images show the
relationship between the NML radio emission and the ionised filaments that
extend north from the NIL, and reveal a new ionised filament to the east,
possibly associated with a galactic wind. Our deep optical images show clear
evidence for a bipolar outflow from the central galaxy extending to
intermediate scales, despite the non-detection of a southern radio counterpart
to the NML. Thus, our observational overview of Centaurus A reveals a number of
features proposed to be associated with AGN feedback mechanisms, often cited as
likely to have significant effects in galaxy evolution models. As one of the
closest galaxies to us, Centaurus A therefore provides a unique laboratory to
examine feedback mechanisms in detail.
