Galaxies hosting an AGN: a view from the CALIFA survey
  We study the presence of optically-selected Active Galactic Nuclei (AGNs)
within a sample of 867 galaxies extracted from the extended {\it Calar-Alto
Legacy Integral Field spectroscopy Area} (eCALIFA) spanning all morphological
classes. We identify 10 Type-I and 24 Type-II AGNs, amounting to $\sim4$ per
cent of our sample, similar to the fraction reported by previous explorations
in the same redshift range. We compare the integrated properties of the ionized
and molecular gas, and stellar population of AGN hosts and their non-active
counterparts, combining them with morphological information. The AGN hosts are
found in transitory parts (i.e. green-valley) in almost all analysed properties
which present bimodal distributions (i.e. a region where reside star-forming
galaxies and another with quiescent/retired ones). Regarding morphology, we
find AGN hosts among the most massive galaxies, with enhanced central
stellar-mass surface density in comparison to the average population at each
morphological type. Moreover, their distribution peaks at the Sab-Sb classes
and none are found among very late-type galaxies (> Scd). Finally, we inspect
how the AGN could act in their hosts regarding the quenching of star-formation.
The main role of the AGN in the quenching process appears to be the removal (or
heating) of molecular gas, rather than an additional suppression of the already
observed decrease of the star-formation efficiency from late-to-early type
galaxies.
