Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..257h&link_type=abstract
Astronomical Journal, vol. 82, Apr. 1977, p. 257-261. NSF-supported research.
Astronomy and Astrophysics
Astronomy
40
Extragalactic Radio Sources, Radiant Flux Density, Radio Sources (Astronomy), Atmospheric Attenuation, Brightness Temperature, Microwave Radiometers, Millimeter Waves, Pointing Control Systems, Radio Telescopes, Tables (Data), Time Dependence
Scientific paper
Results are presented for measurements of the flux densities of 10 variable extragalactic sources at 85.2 or 90 GHz, which were made over a period of almost seven years with the NRAO 36-ft millimeter-wave antenna. The primary flux-density calibration standards used include Jupiter, Saturn, Mars, and the small-diameter Galactic source DR 21. Measured flux densities are given as a function of time (in years) for the sources 3C 84, NRAO 150, 3C 120, OJ 287, 4C 39.25, 3C 273, 3C 279, 3C 345, BL Lac, and 3C 454.3. No statistically meaningful flux-density changes during an observing interval (1 to 3 days) are detected for any source, and a high degree of correlation between flux-density variations at 85.2 or 90 GHz and those observed at lower frequencies is found in all 10 sources. Some variations observed at different frequencies in several individual sources are briefly discussed.
Dent William A.
Hobbs Richard W.
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