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Local luminous infrared (IR) galaxies (LIRGs) have both high star formationrates (SFR) and a high AGN (Seyfert and AGN/starburst composite) incidence.Therefore, they are ideal candidates to explore the co-evolution of black hole(BH) growth and star formation (SF) activity, not necessarily associated withmajor mergers. Here, we use Spitzer/IRS spectroscopy of a completevolume-limited sample of local LIRGs (distances of <78Mpc). We estimate typicalBH masses of 3x10^7 M_sun using [NeIII]15.56micron and optical [OIII]5007A gasvelocity dispersions and literature stellar velocity dispersions. We find thatin a large fraction of local LIRGs the current SFR is taking place not only inthe inner nuclear ~1.5kpc region, as estimated from the nuclear 11.3micron PAHluminosities, but also in the host galaxy. We next use the ratios between theSFRs and BH accretion rates (BHAR) to study whether the SF activity and BHgrowth are contemporaneous in local LIRGs. On average, local LIRGs have SFR toBHAR ratios higher than those of optically selected Seyferts of similar AGNluminosities. However, the majority of the IR-bright galaxies in the RSASeyfert sample behave like local LIRGs. Moreover, the AGN incidence tends to behigher in local LIRGs with the lowest SFRs. All this suggests that in localLIRGs there is a distinct IR-bright star forming phase taking place prior tothe bulk of the current BH growth (i.e., AGN phase). The latter is reflectedfirst as a composite and then as a Seyfert, and later as a non-LIRG opticallyidentified Seyfert nucleus with moderate SF in its host galaxy.

Local Luminous Infrared Galaxies. III. Co-evolution of Black Hole Growth and Star Formation Activity?