Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327l..41l&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 327, April 15, 1988, p. L41-L45. Research supported
Astronomy and Astrophysics
Astronomy
123
Active Galactic Nuclei, Extragalactic Radio Sources, Quasars, Seyfert Galaxies, Star Formation, Stellar Luminosity, Cosmic Dust, Infrared Astronomy Satellite, Line Spectra
Scientific paper
To search for high-luminosity galaxies and quasars, a large sample of warm extragalactic objects (WEO) was selected from the IRAS Point Source Catalog. All sources in an area of 14,000 sq deg were subjected to an IR color requirement, F(25)/F(60) greater than 0.25, optimized to find quasars. Based on optical spectra and morphology, the extragalactic sample of 187 sources contains 12 quasars, 27 Seyfert 1, 73 Seyfert 2, and 65 other emission-line galaxies; 10 sources are not yet classified. Seven of the confirmed quasars were discovered by the IRAS survey and indicate that the local space density of these objects may be significantly higher than deduced from current optical searches. Comparison of the distributions of IR luminosity for the quasar and S1 samples shows noticeable differences. Larger, more complete samples of these systems are needed to confirm the suggestion of a bimodal luminosity distribution reported here and to refine knowledge of space densities for these related populations.
Cutri Roc M.
Huchra John P.
Kleinmann Susan G.
Low Frank J.
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