Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973natur.243..513b&link_type=abstract
Nature, Volume 243, Issue 5409, pp. 513-514 (1973).
Astronomy and Astrophysics
Astronomy
19
Scientific paper
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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