Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasa...15...64c&link_type=abstract
Publications Astronomical Society of Australia, vol. 15, no. 1, p. 64-69
Astronomy and Astrophysics
Astronomy
10
Radiation Mechanisms, Interstellar Medium
Scientific paper
Radio continuum emission due to thermal bremsstrahlung and optical H-alpha spectral line emission arise from processes involving similar atomic entities and physical conditions. The relationship between the flux density of the emission from the two processes H-alpha is mainly a function of the electron temperature of the emitting region, modified by other factors such as the mode of radiation transfer in the hydrogen spectrum. On the other hand, radio continuum radiation due to non-thermal synchrotron emission is formed by species and processes not involved in thermal emission. As a consequence, differences between the observed radio continuum emission and H-alpha emission from cosmic sources can provide reliable information on a variety of important physical aspects of the sources, including the relative importance of thermal and non-thermal radio emission and the degree of optical obscuration. This paper reviews the theory of the formation of H-alpha and the radio continuum in the interstellar medium (ISM), discusses some of the factors that must be considered in comparing observations made in the two frequency regimes, and summarizes the properties of some classes of galactic object that emit both optical and radio radiation.
Bock Douglas C. -J.
Cram Lawrence E.
Green Andrew J.
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