Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332l..13a&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 332, Sept. 1, 1988, p. L13-L17.
Astronomy and Astrophysics
Astrophysics
58
Continuous Spectra, Galactic Radio Waves, Quasars, Seyfert Galaxies, Centimeter Waves, Galactic Nuclei, Spectral Energy Distribution
Scientific paper
The centimeter and millimeter regions of the spectra of radio-quiet quasars and luminous Seyfert 1 nuclei are examined. It is found that steep-spectrum optically thin synchrotron radiation dominates in the 20 cm to 6 cm region of most objects. A flat or rising component which becomes dominant by 2 cm in nine of the 17 cases in the sample is identified as a new continuum component called the high-frequency excess (HFE). The luminous quasar PG 1634 + 706, for which HFE dominates throughout the centimeter region, is discussed in detail. Possible causes of the HFE include self-absorbed synchrotron sources, about 10 to the 6 K nuclear free-free sources, and about 1000 K free-free sources from associated nuclear starbursts. It is concluded that because the brightness temperature predictions are very distinct, future observations will determine which explanation is correct.
Antonucci Robert
Barvainis Richard
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