  We analysed the centre of NGC 1566, which hosts a well-studied active
galactic nucleus (AGN), known for its variability. With the aid of techniques
such as Principal Component Analysis Tomography, analysis of the emission-line
spectra, channel maps, Penalized Pixel Fitting and spectral synthesis applied
to the optical and near-infrared data cubes, besides the analysis of Hubble
Space Telescope images, we found that: (1) the AGN has a Seyfert 1 emission,
with a very strong featureless continuum that we described as a power law with
spectral index of 1.7. However, this emission may come not only from the AGN
[as its point spread function (PSF) is broader than the PSF of the broad-line
region (BLR)], but from hot and young stars, the same ones that probably
account for the observed sigma-drop. (2) There is a correlation between
redshift and the full width at half-maximum of the BLR emission lines. With a
simple model assuming gravitational redshift, we described it as an emitting
ring with varying emitting radii and small inclination angles. (3) There is an
H II region close to the AGN, which is composed of many substructures forming
an apparent spiral with a velocity gradient. (4) We also detected a probable
outflow coming from the AGN and it seems to contaminate the H II region
emission. (5) We identified an H2 rotating disc with orientation approximately
perpendicular to this outflow. This suggests that the rotating disc is an
extension of an inner torus/disc structure, which collimates the outflow
emission, according to the Unified Model.
