Standard sources at 10.6 GHz and variability in 3C147

Details Standard sources at 10.6 GHz and variability in 3C147 Standard sources at 10.6 GHz and variability in 3C147

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....99...36a&link_type=abstract

Astronomy and Astrophysics, vol. 99, no. 1, June 1981, p. 36-38.

Astronomy and Astrophysics

Astronomy

10

Astronomical Catalogs, Astronomical Photometry, Centimeter Waves, Radiant Flux Density, Radio Sources (Astronomy), Calibrating, Quasars, Radio Galaxies

Scientific paper

It is pointed out that the work of Baars et al. (1977), referred to as BGPW, is among the most recent on the subject of the calibration of radio telescopes. BGPW provides flux densities for a set of secondary calibrators. Observations made at the Algonquin Radio Observatory (ARO) provide very accurate relative flux densities for the BGPW calibrators. Attention is given to questions of data derivation, variability, and absolute flux densities. The ARO relative flux densities are converted to the BGPW scale by means of the 'semi-absolute' 3C274. If the obtained values are adopted at 10.6 GHz, the BGPW scale can be used more efficiently in the 10 GHz range. Flux densities at other frequencies in the 10 GHz range can be obtained by using the spectral indices implied by Table 5 of BGPW. In view of the variability of 3C147, and the hints of variability in the observations of several other sources, observers should also bear in mind that any 'absolute' calibration scale may be ephemeral if it is tied to 'standard' sources that are assumed to be constant.

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