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Warm ultraluminous galaxies in the IRAS survey - The transition from galaxy to quasar?
Sanders, D. B.; Soifer, B. T.; Elias, J. H.; Neugebauer, G.; Matthews, K.
AA(Palomar Observatory, Pasadena, CA), AB(Palomar Observatory, Pasadena, CA), AC(Palomar Observatory, Pasadena, CA), AD(Palomar Observatory, Pasadena, CA), AE(Palomar Observatory, Pasadena, CA)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 328, May 15, 1988, p. L35-L39. NSF-supported research. (ApJL Homepage)
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NASA/STI Keywords:
Infrared Astronomy Satellite, Infrared Sources (Astronomy), Quasars, Spiral Galaxies, Galactic Structure, Luminosity, Red Shift
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Of 90 extragalactic objects chosen from the IRAS catalog on the basis of brightness at 60 mum and "warm" infrared color [fnu(25 mum)/fnu(60 mum) >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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