NGC 7469 as seen by MEGARA: new results from high-resolution IFU
  spectroscopy
  We present our analysis of high-resolution (R $\sim$ 20 000) GTC/MEGARA
integral-field unit spectroscopic observations, obtained during the
commissioning run, in the inner region (12.5 arcsec x 11.3 arcsec) of the
active galaxy NGC7469, at spatial scales of 0.62 arcsec. We explore the
kinematics, dynamics, ionisation mechanisms and oxygen abundances of the
ionised gas, by modelling the H$\alpha$-[NII] emission lines at high
signal-to-noise (>15) with multiple Gaussian components. MEGARA observations
reveal, for the first time for NGC7469, the presence of a very thin (20 pc)
ionised gas disc supported by rotation (V/$\sigma$ = 4.3), embedded in a
thicker (222 pc), dynamically hotter (V/$\sigma$ = 1.3) one. These discs nearly
co-rotate with similar peak-to-peak velocities (163 vs. 137 km/s ), but with
different average velocity dispersion (38 vs. 108 km/s ). The kinematics of
both discs could be possibly perturbed by star-forming regions. We interpret
the morphology and the kinematics of a third (broader) component ($\sigma$ >
250 km/s) as suggestive of the presence of non-rotational turbulent motions
possibly associated either to an outflow or to the lense. For the narrow
component, the [NII]/H$\alpha$ ratios point to the star-formation as the
dominant mechanism of ionisation, being consistent with ionisation from shocks
in the case of the intermediate component. All components have roughly solar
metallicity. In the nuclear region of NGC7469, at r < 1.85 arcsec, a very broad
(FWHM = 2590 km/s ) H{\alpha} component is contributing (41%) to the global
H$\alpha$ -[NII]profile, being originated in the (unresolved) broad line region
of the Seyfert 1.5 nucleus of NGC7469.
