Effect of AGN on the morphological properties of their host galaxies in
  the local Universe
  The morphological classification of active galaxies may be affected by the
presence of active galactic nuclei (AGN). In this paper, we provide the most
detailed analysis on how different AGN contributions, from 5% to 75%, to the
total optical light may affect six commonly used morphological parameters and
the final classification of AGN host galaxies at z$\sim$0. We used a local
sample of >2000 visually classified non-active galaxies, to quantify how the
contribution of a bright nuclear point source of different intensity could
affect morphological parameters such as: asymmetry, Abraham concentration
index, Gini, M20 moment of light, smoothness, and Concelice-Bershady
concentration index. We found that most of the morphological parameters are
affected by AGN contributions above 25%, with late-type galaxies being more
affected than early-types. We found that Gini, Abraham concentration index and
asymmetry are the most stable parameters even for AGN contributions above 25%,
in comparison to Concelice-Bershady concentration index and M20 moment of
light. Smoothness parameter shall be avoided when classifying AGN host
galaxies, or at least it shall be used simultaneously in combination with
several other parameters.
