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Published February 1, 1983 | Published
Journal Article Open

Infrared/optical energy distributions of high-redshift quasars


Measurements at 1.2, 1.6, and 2.2 μm have been combined with visual spectrophotometry of 21 quasars having redshifts z ≥2.66. The primary result of this study is that the rest frame visual/ultraviolet continua of the high-redshift quasars are well described by a sum of a power-law continuum with slope ~ - 0.4 and a 3000 Å bump. The rest frame visual/ultraviolet continua of these quasars are quite similar to that of 3C 273, the archetype of low-redshift quasars. There do not appear to be any significant visual/ultraviolet properties distinguishing high-redshift quasars selected via visual or radio techniques.

Additional Information

© 1983 American Astronomical Society. Received 1982 April 26; accepted 1982 July 30. We thank J. Carrasco and K. Sellgren for help with the observations. Infrared research at Caltech is supported by grants from NSF and NASA. The research of J.B.O. is supported by NASA grant NSG 05-002-134.

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