Abstract
THE 101–000 transition of the HNCO molecule at 21.9817 GHz has been detected using a 1.4 cm parametric amplifier at the 36 foot telescope of the US National Radio Astronomy Observatory1. The present observations were made with the same receiver and the 85-foot Maryland Point telescope of the US Naval Research Laboratory. The receiver has a single sideband system temperature of 600 K achieved by the use of a degenerate parametric amplifier with 20 dB of gain2. The filter bank receiver used to obtain the spectral line data consisted of 20 channels each 0.5 MHz in width giving a total velocity span of 135 km s−1. At 1.4 cm the beamwidth of the telescope is approximately 2.1 arc min and the beam efficiency is 60%.
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