Absolute Flux Measurements at 9.5 and 4.5 cm.

Abstract

view Abstract Citations (11) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Absolute Flux Measurements at 9.5 and 4.5 cm. Medd, W. J. ; Ramana, K. V. V. Abstract A program of absolute flux measurements on the stronger discrete radio sources has been undertaken at the Algonquin Radio Observatory of the National Research Council of Canada. For this purpose the power gain of a horn- reflector antenna has been quite accurately determined by Jull and Deloli (IEEE Trans. AP-12, No. 4, 439, 1964) over a range of wavelengths from 2 to 10 cm. Flux measurements at 9.5 cm (v=3.lS Gc/sec) have been completed. Familiar techniques based on temperature measurements of resistive terminations and transit-type observations of the various sources, have been employed. The results (1964.4) for Cassiopeia A, Taurus A, Cygnus A, and the Orion Nebula, in units of 10--~ NV m-2 (cps)-1, are, respectively, 1260, 695, 640, and 445, accurate to ft4% probable error. At 4.5 cm (6.66 Gc/sec) similar measurements (1965.0), of approximately the same accuracy, have yielded 675 flux units for Cassiopeia A, and 565 flux units for Taurus A. The program of observations for Cygnus A and the Orion Nebula has not been completed; tentative flux density values are 265 and 395 units, respectively. Publication: The Astronomical Journal Pub Date: 1965 DOI: 10.1086/109539 Bibcode: 1965AJ.....70Q.327M full text sources ADS |