Study of AGN contribution on morphological parameters of their host
  galaxies
  We tested how the AGN contribution (5% - 75% of the total flux) may affect
different morphological parameters commonly used in galaxy classification. We
carried out all analysis at $z$,$sim$,0 and at higher redshifts that correspond
to the COSMOS field. Using a local training sample of $>$,2000 visually
classified galaxies, we carried out all measurements with and without the
central source and quantified how the contribution of a bright nuclear point
source could affect different morphological parameters, such as: Abraham and
Concelice-Bershady indices, Gini, Asymmetry, $M20$ moment of light, and
Smoothness. We found that concentration indexes are less sensitive to both
redshift and brightness in comparison to the other parameters. We also found
that all parameters change significantly with AGN contribution. At $z$$\sim$0,
up to a 10% of AGN contribution the morphological classification will not be
significantly affect, but for $\ge$25% of AGN contribution late-type spirals
follow the range of parameters of elliptical galaxies and can therefore be
misclassified early types.
