Serendipitous discovery of an optical emission line jet in NGC\,232
  We report the detection of a highly collimated linear emission-line structure
in the spiral galaxy NGC\,232 through the use of integral field spectroscopy
data from the All-weather MUse Supernova Integral field Nearby Galaxies
(AMUSING) survey. This jet--like feature extends radially from the nucleus and
is primarily detected in [oiii]$\lambda$5007 without clear evidence of an
optical continuum counterpart. The length of the radial structure projected on
sky reaches $\sim 3$ kpc, which makes NGC\,232 the second longest emission-line
jet reported. The ionized gas presents extreme [Oiii]/H$\beta$ and
[Nii]/H$\alpha$ line ratios, increasing along the jet-like structure. We
discuss three possible scenarios to explain the observed structure: (i) direct
ionization of in-falling material from the intergalactic medium by the AGN;
(ii) photo-ionization by an un-detected optical counter-part of the radio jet
and (iii) fast shocks ionization due to the lateral expansion of the radio jet
across the ISM. Our analysis favors in-situ ionization.
