Warm Ultraluminous Galaxies in the IRAS Survey: The Transition from Galaxy to Quasar?
Abstract
Of 90 extragalactic objects chosen from the IRAS catalog on the basis of brightness at 60 microns and "warm" infrared color [fnu_(25 microns)/fnu_(60 microns) > 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 1988
- DOI:
- 10.1086/185155
- Bibcode:
- 1988ApJ...328L..35S
- Keywords:
-
- Infrared Astronomy Satellite;
- Infrared Sources (Astronomy);
- Quasars;
- Spiral Galaxies;
- Galactic Structure;
- Luminosity;
- Red Shift;
- Astrophysics;
- GALAXIES: GENERAL;
- INFRARED: GENERAL;
- INFRARED: SOURCES;
- QUASARS