Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..776o&link_type=abstract
Astronomical Journal, vol. 82, Oct. 1977, p. 776-780.
Astronomy and Astrophysics
Astronomy
33
Extragalactic Radio Sources, Millimeter Waves, Radio Astronomy, Radio Spectra, Astronomical Catalogs, Emission Spectra, Optical Properties, Quasars, Sky Surveys (Astronomy), Stellar Magnitude
Scientific paper
Observations at 90 GHz of a sample of 38 sources chosen to have flat or rising spectra between 0.318 and 5 GHz are reported. Roughly 25% of the sources were found to have flat or rising spectra between 5 and 90 GHz. The optical magnitude of each of the sources from the E print of the Palomar Sky Survey has also been estimated. Evidence is found for a correlation between the 90-GHz flux density and the optical magnitude, suggesting a relationship between the emission processes at these frequencies. Little evidence is found for a correlation between the low- and high-frequency spectral indices of the sources. This suggests that the sources tend to be opaque at centimeter wavelengths and optically thin at millimeter wavelengths. The properties of two of the more interesting sources are also discussed. Evidence is presented that strong millimeter activity may be generally associated with the BL Lac phenomenon.
Mufson Stuart Lee
Owen Frazer N.
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