  Using SDSS spectra, we applied an automatic method to search for outflows
(OFs) in three large samples of narrow-line AGN at low redshifts (z < 0.4),
separated in three spectral activity classes: radio-loud RG, 15,793,
radio-quiet, Sy2, 18,585, and LINER, 25,656. In general, the probability of
detecting an OF decreases along the sequence Sy1->Sy2->LINER/RG and,
independently of the AGN class, the wind velocity, traced by W80, increases
with the AGN luminosity. Moreover W80 is systematically higher in RG or any of
the other AGN class when detected in radio. These results support the idea that
there are two main modes of production of OF, the radiative mode dominant in
radio-quiet AGN and the jet mode dominant in radio-loud galaxies, although both
modes could also happen simultaneously at different levels. From the spectra
and SDSS photometry, the characteristics of the AGN host galaxies and their
super-massive black holes (SMBHs) were also retrieved using the stellar
population synthesis code STARLIGHT. This revealed that, independently of their
spectral class, 1) galaxy hosts with OFs have systematically later
morphological types and higher star formation rates than their counterpart
without OF, 2) they occupy different positions in the specific diagnostic
diagram, sSMBH vs. sSFR, which suggests they follow different evolutionary
paths congruent with the morphology of their galaxy hosts, and 3) they show no
evidence of AGN quenching or triggering of star formation. These results are
consistent with a scenario explaining the different AGN classes as consequences
of different formation processes of galaxies: early-type galaxies (LINER and
RG) formed bigger bulges and more massive SMBHs, exhausting their reservoir of
gas more rapidly than late-type galaxies (Sy2 and Sy1), quenching their star
formation and starving their SMBHs.
