Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.193..781h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 193, Dec. 1980, p. 781-792. Research supported by the National Research
Astronomy and Astrophysics
Astronomy
3
Galactic Nuclei, H Alpha Line, Hydrogen Recombinations, Radio Spectra, Electron Density Profiles, Emission Spectra, H Ii Regions, Ionized Gases
Scientific paper
The hydrogen recombination lines H351-alpha, H252-alpha, and H166-alpha have been used to investigate the properties of low-density ionized gas which lies in the direction of the Galactic Center. A limit of less than 5 K antenna temperature was found for the H351-alpha line, which implies that the electron density of the region is not less than 5/cu cm. Limits can be placed on the emission measure of lower density components in the interstellar medium in the direction of the Galactic Center. If T(e) = 5000 K is assumed, the emission measure of this component is less than 50 pc/cm to the 6th for electron densities less than 1/cu cm. H166-alpha and H252-alpha observations show that the low density gas extends over approximately 2.5 deg and coincides with a prominent absorption feature seen on low-frequency (29.9 MHz) continuum maps. It is concluded that the ionized gas arises from evolved H II regions which partially overlap in front of the Galactic Center.
Hart L.
Pedlar Alan
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