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Quasars measured by the Infrared Astronomical Satellite
Neugebauer, G.; Miley, G. K.; Soifer, B. T.; Clegg, P. E.
AA(Palomar Observatory, Pasadena, CA), AB(Space Telescope Science Institute, Baltimore, MD; Leiden, Rijksuniversiteit, Sterrewacht, Netherlands), AC(Palomar Observatory, Pasadena, CA), AD(Queen Mary College, London, England)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. 815-828. NSF-supported research. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Astronomical Spectroscopy, Infrared Spectra, Quasars, Spaceborne Astronomy, Emission Spectra, Infrared Astronomy Satellite, Luminosity, Radiant Flux Density, Signal To Noise Ratios, Thermal Emission
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Measurements from 12 to 100 microns of 179 quasars observed with the IRAS satellite are presented; of these 74 have detections with signal-to-noise ratios greater than four in at least one wavelength band. The infrared flux densities of the quasars with flat radio spectra generally lie on a smooth interpolation between measurements at visible and radio wavelengths. For the radio quiet quasars the peak in the flux densities appears in the far-infrared. The luminosities near 60 microns of the flat spectrum radio sources extend to significantly higher values than do those of the radio quiet quasars or those with steep radio spectral indexes. From these observations there are no infrared properties of quasars that are strongly correlated with their radio properties. There is strong circumstantial evidence from the observations that the infrared emission from the quasars whose radio emission has a flat spectrum is predominantly nonthermal in origin.

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