Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.184..145r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 184, July 1978, p. 145-148.
Astronomy and Astrophysics
Astronomy
4
Galactic Nuclei, H Alpha Line, Interstellar Gas, Radio Astronomy, Autocorrelation, Emission Spectra, Milky Way Galaxy, Radio Telescopes, Spectral Line Width
Scientific paper
The reported observations were made at 7.8 GHz with the aid of a 36.6-m radiotelescope. A cooled parametric amplifier fed the signal into a 100-channel autocorrelation spectrometer sampling a 25-MHz bandwidth. The main-beam output was switched at 5 Hz against that from a sky horn. The parameters of the observed line agree with the expected high-frequency counterpart of the extended H166-alpha emission observed by Kesteven and Pedlar (1977), indicating that both line emissions come from ionized gas close to LTE. Plausible mechanisms capable of explaining the large width of this emission are systematic expansion of contraction, or supersonic turbulence. Observations of helium radio recombination-lines may clarify the nature of the ionizing agent of this extended gas.
Chaisson Eric. J.
Rodriguez Luis F.
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