An Absolute Flux Density Measurement of the Supernova Remnant Casseopia A at 32 GHz

Abstract

We report 32 GHz absolute flux density measurements of the supernova remnant Cas A, with an accuracy of 2.5%. The measurements were made with the 1.5-meter telescope at the Owens Valley Radio Observatory. The antenna gain had been measured by NIST in May 1990 to be $0.505\pm 0.007\frac{\mathrm{mK}}{\mathrm{Jy}}$. Our observations of Cas A in May 1998 yield $S_{cas,1998}=194\pm 5\mathrm{Jy}$. We also report absolute flux density measurements of 3C48, 3C147, 3C286, Jupiter, Saturn and Mars.

30 pages, 4 figures; accepted for publication by AJ. Revised systematic error budget, corrected typos, and added references

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