Physics
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aujph..29..419b&link_type=abstract
Australian Journal of Physics, vol. 29, Oct. 1976, p. 419-433.
Physics
2
Galactic Radiation, Interstellar Matter, Line Spectra, Radiative Recombination, Radio Emission, Astronomical Models, Equators, H Ii Regions, Hydrogen Ions, Plasma Clouds, Radio Telescopes, Thermal Emission
Scientific paper
Since relatively few recombination line observations of galactic sources have been made near 400 MHz, the major part of the galactic equator region has not been examined in any systematic manner. Results are presented for an investigation in which the Molonglo radio telescope is used to scan the galactic equator region in a search for H252-alpha recombination emission line, particularly for the regions at galactic longitudes no more than about 40 deg. The observed upper limits for H252-alpha line emission are used to deduce physical properties of the interstellar medium along the line of sight. Lower limits for the electron density obtained by considering probable non-LTE effects suggest that the thermal emission is due to low surface brightness HII regions rather than to the hot component of the general interstellar medium.
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