Of 90 extragalactic objects chosen from the I RAS catalog on the basis of brightness at 60 m and "warm" infrared color [f.(25 m)lfv(60 m) > 0.2], 12 have luminosities characteristic of quasars. These 12 ultraluminous objects have Seyfert spectra, and nine of them show morphological evidence for recent collisions or mergers-they plausibly represent a transition stage between cooler ultraluminous infrared galaxies and optical quasars.
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Sanders et al. (1988) studied this question.