Simultaneous radio spectra of sources with strong millimeter components

Details Simultaneous radio spectra of sources with strong millimeter components Simultaneous radio spectra of sources with strong millimeter components

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85..351o&link_type=abstract

Astronomical Journal, vol. 85, Apr. 1980, p. 351-362.

Astronomy and Astrophysics

Astronomy

99

Extragalactic Radio Sources, Microwave Spectra, Astronomical Catalogs, Error Analysis, Radiant Flux Density, Radio Astronomy, Tables (Data)

Scientific paper

Simultaneous radio spectra (within a 36-day period) are presented for 136 sources with flat or inverted spectra at centimeter wavelengths. Flux densities were measured at up to 11 frequencies ranging from 318 MHz to 90 GHz. At low frequencies (less than 1 GHz) a comparison of our data with previous measurements yielded several new low-frequency variables. The observations below 1 GHz also showed that many flat-spectrum sources have an upturn in their spectra below 1 GHz, probably owing to an optically thin 'halo.' Very few, if any, sources seem to have a real low-frequency cutoff. At 5 GHz, sources with high-frequency turnovers below 30 GHz showed much less variability over one year than those which were stronger than 1 Jy at 90 GHz. However, sources with S(90) greater than 1 Jy had variations only a little larger at 90 GHz than at 5 GHz. This latter result seems inconsistent with either simple inhomogeneous or relativistic Maxwellian models. Models with relativistic jets close to the line of sight can probably account for most of our results.

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