Intermediate age stars as origin of the low velocity dispersion nuclear
  ring in Mrk1066
  We report the first two-dimensional stellar population synthesis in the
near-infrared of the nuclear region of an active galaxy, namely Mrk1066.
  We have used integral field spectroscopy with adaptive optics at the Gemini
North Telescope to map the to map the age distribution of the stellar
population in the inner 300 pc at a spatial resolution of 35 pc. An old stellar
population component (age >5Gyr) is dominant within the inner ~160pc, which we
attribute to the galaxy bulge. Beyond this region, up to the borders of the
observation field (~300 pc), intermediate age components (0.3-0.7Gyr) dominate.
We find a spatial correlation between this intermediate age component and a
partial ring of low stellar velocity dispersions (sigma). Low-sigma nuclear
rings have been observed in other active galaxies and our result for Mrk1066
suggests that they are formed by intermediate age stars. This age is consistent
with an origin for the low-sigma rings in a past event which triggered an
inflow of gas and formed stars which still keep the colder kinematics (as
compared to that of the bulge) of the gas from which they have formed. At the
nucleus proper we detect, in addition, two unresolved components: a compact
infrared source, consistent with an origin in hot dust with mass ~1.9x10^{-2}
M_Sun, and a blue featureless power-law continuum, which contributes with only
~15% of the flux at 2.12 microns.
