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We investigate the evolutionary connection between local IR-bright galaxies($\log L_{\rm IR}\ge 11.4\,L_\odot$) and quasars. We use high angularresolution ($\sim$ 0.3-0.4 arcsec $\sim$ few hundred parsecs) $8-13\,\mu$mground-based spectroscopy to disentangle the AGN mid-IR properties from thoseof star formation. The comparison between the nuclear $11.3\,\mu$m PAH featureemission and that measured with Spitzer/IRS indicates that the star formationis extended over a few kpc in the IR-bright galaxies. The AGN contribution tothe total IR luminosity of IR-bright galaxies is lower than in quasars.Although the dust distribution is predicted to change as IR-bright galaxiesevolve to IR-bright quasars and then to optical quasars, we show that the AGNmid-IR emission of all the quasars in our sample is not significantlydifferent. In contrast, the nuclear emission of IR-bright galaxies with low AGNcontributions appears more heavily embedded in dust although there is no cleartrend with the interaction stage or projected nuclear separation. This suggeststhat the changes in the distribution of the nuclear obscuring material may betaking place rapidly and at different interaction stages washing out theevidence of an evolutionary path. When compared to normal AGN, the nuclear starformation activity of quasars appears to be dimming whereas it is enhanced insome IR-bright nuclei, suggesting that the latter are in an earlierstar-formation dominated phase.

The complex evolutionary paths of local infrared bright galaxies: a high angular resolution mid-infrared view