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Continuum energy distribution of quasars - Shapes and origins [ Erratum: 1990ApJ...357..291S ]
Sanders, D. B.; Phinney, E. S.; Neugebauer, G.; Soifer, B. T.; Matthews, K.
AA(Palomar Observatory, Pasadena, CA), AB(Palomar Observatory, Pasadena, CA), AC(Palomar Observatory, Pasadena, CA), AD(Palomar Observatory, Pasadena, CA), AE(Palomar Observatory, Pasadena, CA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 29-51. Research supported by NASA IRAS Extended Mission Program and Irvine Foundation. (ApJ Homepage)
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NASA/STI Keywords:
Astronomical Spectroscopy, Continuous Spectra, Infrared Sources (Astronomy), Quasars, Spectral Energy Distribution, Spectrum Analysis, Accretion Disks, Blazars, Infrared Spectra, Seyfert Galaxies, Sky Surveys (Astronomy)
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Continuum observations from 0.3 nm to 6 cm are presented for 109 optically selected quasars from the Palomar-Green (PG) Bright Quasar Survey. The far-infrared to soft X-ray continuum of radio-quiet and steep-spectrum radio-loud PG quasars can be described in a model consisting of two broad peaks: an 'infrared bump' at about 2 microns to 1 mm and the well-known 'big blue bump' at about 10 nm to 0.3 micron. All PG quasars emit a significant fraction of their bolometric luminosity at infrared wavelengths of 1.5-100 microns. The fraction varies from 10 to 50 percent with a typical value of 30 percent. The ratio of the 6 cm flux density to that at 1 micron has a bimodal distribution. There is no evidence for a tight correlation between the infrared and X-ray continua of quasars. It is suggested that the bulk of the emission between 2 microns and 1 mm in the infrared bump of the radio-quiet PG quasars and the radio-loud quasars with steep radio spectral indices is produced by thermal processes.

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