Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964natur.201..380w&link_type=abstract
Nature, Volume 201, Issue 4917, pp. 380 (1964).
Astronomy and Astrophysics
Astronomy
6
Scientific paper
WE would like to confirm Weinreb, Barrett, Meeks and Henry's1 discovery of the hydroxyl (OH) radical in the interstellar medium at frequency 1667.36 Mc/s. Fig. 1. shows observations of the Sagittarius A source in the frequency range 1,667.672-1,667.210 Mc/s. These observations were made between December 2 and December 9, 1963, with the 33-ft. antenna at the Hat Creek Radio Astronomy Observatory of the University of California, Berkeley. We used a switched-frequency receiver in which the comparison channel was fixed at 1,669 Mc/s and the signal channel, of bandwidth 50 kc/s, was scanned over the spectrum at the rate of 0.93 Mc/s per hour. The output of the receiver was digitized. `Print-out' occurred every 23.3 kc/s during the scan; this corresponds to an integration time of 90 sec per point. For the receiver used we found an excess system noise of 750° K. We may thus expect (and we find) a root mean square uncertainty of 0.7° K for a single readout. The mean error of a plotted point on the OH curve in Fig. 1 is +/- 0.13° K. The plotted frequency profile represents the mean of 29 scans.
Weaver Harold F.
Williams R. Williams D. R. D.
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