Spotting the differences between active and non-active twin galaxies on
  kpc-scales. A pilot study
  We present a pilot study aimed to identify large-scale galaxy properties that
could play a role in activating a quiescent nucleus. To do so, we compare the
properties of two isolated nearby active galaxies and their non-active twins
selected from the Calar Alto Legacy Integral Field Area (CALIFA) survey. This
pilot sample includes two barred and two unbarred galaxies. We characterise the
stellar and ionised gas kinematics and also their stellar content. We obtain
simple kinematic models by fitting the full stellar and ionised gas velocity
fields and just the approaching/receding sides. We find that the analysed
active galaxies present lopsided disks and higher values of the global stellar
angular momentum ($\lambda_{R}$) than their non-active twins. This could be
indicating that the stellar disks of the AGN gained angular momentum from the
inflowing gas that triggered the nuclear activity. The inflow of gas could have
been produced by a twisted disk instability in the case of the unbarred AGN,
and by the bar in the case of the barred AGN. In addition, we find that the
central regions of the studied active galaxies show older stellar populations
than their non-active twins. The next step is to statistically explore these
galaxy properties in a larger sample of twin galaxies.
