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We present an analysis of the 5–8 μm  Spitzer ‐IRS spectra of a sample of 68 local ultraluminous infrared galaxies (ULIRGs). Our diagnostic technique allows a clear separation of the active galactic nucleus (AGN) and starburst (SB) components in the observed mid‐infrared emission, and a simple analytic model provides a  quantitative  estimate of the AGN/SB contribution to the bolometric luminosity. We show that AGN are ∼30 times brighter at 6 μm than SBs with the same bolometric luminosity, so that even faint AGN can be detected. Star formation events are confirmed as the dominant power source for extreme IR activity, since ∼85 per cent of ULIRG luminosity arises from the SB component. None the less an AGN is present in the majority (46/68) of our sources.

Spectral decomposition of starbursts and active galactic nuclei in 5–8 μm Spitzer ‐IRS spectra of local ultraluminous infrared galaxies