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Australian Journal of Physics Australian Journal of Physics Society
A journal for the publication of original research in all branches of physics
RESEARCH ARTICLE

A Search for Recombination Line Emission from the Galactic Equator at 408 MHz

MJ Batty

Australian Journal of Physics 29(5) 419 - 434
Published: 1976

Abstract

A search for H 2520( recombination line emission was made by scanning the galactic equator region using the Molonglo radio telescope. Upper limits were established over the range of galactic longitude accessible to the instrument. For the region III ;S 40°, estimates of the background thermal continuum brightness temperature were used to derive lower limits of ~ 2000 K for the electron temperature of the gas along the line of sight. Lower limits for the electron density obtained by considering probable non-LTE effects suggest that the thermal emission over this range is due to low surface brightness HII regions. The observed H 2520( upper limit averaged over the range 270° ;S I ;S 320° just admits the line intensity calculated by Shaver (1975) for the cold cloud component of the general interstellar medium.

https://doi.org/10.1071/PH760419

© CSIRO 1976

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