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We study in detail the inner 600 pc of the Seyfert 2 galaxy ESO138-G001 bymeans of the SOAR Integral Field Spectrograph (SIFS) attached to the SOARtelescope. This source is known for displaying a very rich coronal linespectrum and a blob of high-excitation emission ~3" SE of the active galacticnucleus (AGN). The nature of this emission has not been fully understood yet.The excellent spatial and spectral resolution of SIFS allows us to confirm thatthe bulk of the coronal line forest emission region is very compact, of ~0.8"in diameter, centred on the AGN and most likely powered by radiation from theAGN. In addition, evidence of a nuclear outflow, restricted to the inner 1"centred at the nucleus is found based on the detection of broad components inthe most important emission lines. The gas in the inner few tens of parsecsfilters out the AGN continuum so that the NLR is basically illuminated by amodified SED. This scenario is confirmed by means of photoionisation modelsthat reproduce the most important lines detected in the SIFS field-of-view.From the modelling, we also found that the black hole mass M_BH of the AGN isabout 10^5.5 solar mass, in agreement with previous X-ray observations. Thespectrum of the SE blob is dominated by emission lines of low- tomid-ionisation, with no hints of coronal lines. Our results show that itrepresents gas in the ionisation cone that is photoionised by the filteredcentral AGN continuum.

The Narrow Line Region properties of ESO138-G001 unveiled by SOAR/SIFS observations