The spectral flux distributions of sources in an optically selected sample of QSOs - 10 to the 13th-10 to the 15th HZ

Details The spectral flux distributions of sources in an optically selected sample of QSOs - 10 to the 13th-10 to the 15th HZ The spectral flux distributions of sources in an optically selected sample of QSOs - 10 to the 13th-10 to the 15th HZ

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..413c&link_type=abstract

Astrophysical Journal, Part 1, vol. 255, Apr. 15, 1982, p. 413-418. NSF-supported research.

Astronomy and Astrophysics

Astronomy

11

Astronomical Spectroscopy, Infrared Spectra, Quasars, Red Shift, Spectral Energy Distribution, Radio Astronomy, Spectrophotometry, Visible Spectrum

Scientific paper

Previously published data is combined with extentions of VLA data on optically-selected QSOs from the 6 cm wavelength to 3.5, 10 and 20 microns, to examine potential differences between spectral flux distributions of radio-loud and radio-quiet QSOs. It is found that some objects have steep spectral distributions in the IR which are similar to the flux distribution of the type 2 Seyfert galactic nucleus NGC 1085, and that most low-redshift quasars have a type of spectral distribution similar to that of objects with strongly nonthermal characteristics. Some high-redshift quasars that are radio-quiet exhibit flat flux distributions. The question of whether this flat flux distribution phenomenon indicates a weak, nonthermal contribution at UV wavelengths in the rest system of these objects, which could be related to the low radio emission, is addressed.

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