A 700-pc extended coronal gas emission in the Circinus galaxy
  We report the first characterization of an extended outflow of high ionized
gas in the Circinus Galaxy by means of the coronal line [FeVII] $\lambda$6087
\AA. This emission is located within the ionization cone already detected in
the [OIII] $\lambda$5007 \AA\ line and is found to extend up to a distance of
700 pc from the AGN. The gas distribution appears clumpy, with several knots of
emission. Its kinematics is complex, with split profiles and line centroids
shifted from the systemic velocity. The physical conditions of the gas show
that the extended coronal emission is likely the remnants of shells inflated by
the passage of a radio-jet. This scenario is supported by extended X-ray
emission, which is spatially coincident with the morphology and extension of
the [FeVII] $\lambda$6087~\AA\ gas in the NW side of the galaxy. The extension
of the coronal gas in the Circinus galaxy is unique among active galaxies and
demonstrates the usefulness of coronal lines for tracing the shock ionization
component in these objects.
