High-resolution Microwave Spectra of H and OH Absorption Lines of Cassiopeia A

Details High-resolution Microwave Spectra of H and OH Absorption Lines of Cassiopeia A High-resolution Microwave Spectra of H and OH Absorption Lines of Cassiopeia A

May 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964natur.202..475b&link_type=abstract

Nature, Volume 202, Issue 4931, pp. 475-476 (1964).

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Scientific paper

IN a recent communication Weinreb, Barrett, Meeks and Henry1 reported the discovery of the 18-cm lines of the hydroxyl (OH) radical in the radio absorption spectra of Cassiopeia A, and the result was quickly confirmed by several others2-4. Here we present the results of investigations of the -0.8 km/sec absorption line from Cassiopeia A at both H and OH line frequencies with a frequency resolution as narrow as 1.87 kc/s. From these observations we can derive the kinetic temperature of the absorbing gas. The equipment used in the OH observations was the same as used previously1, except for the modification necessary to obtain the higher frequency resolution. In our earlier work a 100-kc/s portion of the spectrum was examined with a resolution of 7.5 kc/s, and in the work reported here we also examined either a 50-kc/s portion with a resolution of 3.75 kc/s or a 25-kc/s portion with a resolution of 1.87 kc/s. It is found that the - 0.8 km/sec absorption line at OH frequencies is in reality composed of two lines, separated by 7.5 kc/s, having approximately equal intensities, and having line-widths (full-width at half maximum) of 4.2 kc/s and 4.8 kc/s after correction for the receiver resolution. The observed spectra for the three frequency resolutions used are shown in Fig. 1.

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