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Published May 15, 1988 | Published
Journal Article Open

Warm ultraluminous galaxies in the IRAS survey - The transition from galaxy to quasar?


Of 90 extragalactic objects chosen from the IRAS catalog on the basis of brightness at 60 mum and "warm" infrared color [f_ ν(25 µm)/f_ ν(60 µm) >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.

Additional Information

© 1988 American Astronomical Society. Received 1987 December 29; accepted 1988 February 12. We thank our night assistants at Palomar, Juan Carasco and Skip Staples, for assistance in obtaining the observations. G. N., D. B. S., and B. T. S. were supported in part by the IRAS extended mission program. Ground-based astronomy at Caltech is supported by a grant from the NSF. The Palomar 1.5 m telescope is operated jointly by the California Institute of Technology and the Carnegie Institution of Washington.

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Published - 1988ApJ___328L__35S.pdf


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