NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T17:34:31 PDT
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For refcode 1988ApJ...327L..41L:
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1988ApJ...327L..41L INFRARED COLOR-SELECTED QUASARS AND SEYFERT 1 GALAXIES F. J. LOW Steward Observatory, University of Arizona J. P. HUCHRA Harvard-Smithsonian Center for Astrophysics S. G. KLEINMANN Department of Physics and Astronomy, University of Massachusetts AND R. M. CUTRI Steward Observatory, University of Arizona Received 1987 November 13; accepted 1988 January 11 ABSTRACT 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 deg^2^ were subjected to an IR color requirement, F(25)/F(60) > 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 our knowledge of space densities for these related populations. Subject headings: galaxies: general - infrared: sources - quasars
Retrieve 42 NED objects in this reference.
Please click here for ADS abstract

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