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Using a sample of 229618 narrow emission-line galaxies, we have determinedthe normal star formation histories (SFHs) for galaxies with different activitytypes: star forming galaxies (SFGs), transition type objects (TOs), Seyfert 2s(Sy2s) and LINERs. We find that the variation of the SFH with the activity typeis explained by the mass of the galaxies and the importance of their bulge: theLINERs reside in massive early-type galaxies, the Sy2s and TOs are hosted byintermediate mass galaxies with intermediate morphological types, and the SFGsare found in lower mass late-type spirals. Except for the Sy2s, the moremassive galaxies formed the bulk of their stars more rapidly than the lessmassive ones. The Sy2s formed their stars more slowly and show presently anexcess in star formation. We have also found that the maximum in star formationrate in the past increases with the virial mass within the aperture (VMA), theVMA increasing from the SFGs to the TOs, to the Sy2s, culminating in theLINERs. This correlation suggests that the bulges and the supermassive blackholes at the center of galaxies grow in parallel, in good agreement with theM(BH)-sigma relation.

What do the Star Formation Histories of Galaxies tell us about the Starburst-AGN connection?