A treatment procedure for GMOS/IFU data cubes: application to NGC 2835
  We present a set of treatment techniques for GMOS/IFU data cubes, including:
correction of the differential atmospheric refraction; Butterworth spatial
filtering, to remove high spatial-frequency noise; instrumental fingerprint
removal; Richardson-Lucy deconvolution, to improve the spatial resolution of
the observations. A comparison with HST images shows that the treatment
techniques preserve the morphology of the spatial structures in the data cubes,
without introducing distortions or ghost features. The treatment procedure
applied to the data cube of the central region of the late-type galaxy NGC 2835
allowed the detection of a nuclear emitting region with emission-line ratios
indicating a probable LINER, although the classifications of Transition Object
or Seyfert galaxy cannot be discarded. Such a detection was not possible
without the data treatment. This shows that the benefits provided by this
treatment procedure are not merely cosmetic, but actually affect the quality of
different types of analyses, like the determination of the fraction of
galaxies, of different morphological types, with a central
Seyfert/LINER/Transition object emission.
