A technique for separating the galactic thermal radio emission from the non-thermal component by means of the associated infrared emission

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Abstract
A detailed correlation is shown to exist between the IRAS 60-μm band emission from the galactic disc and the radio continuum emission measured with a similar angular resolution by Reich et al. at 11 cm and Haynes et al. at 6 cm. A major part of the radio continuum at these frequencies is from thermal bremsstrahlung, and the detailed correlation with the 60-μm band emission shows that an important fraction of the latter must be associated with H II regions (not only the compact regions but also the extended low-density regions). To reveal this component more clearly, the infrared emission from H I-associated dust has been modelled in detail and subtracted from both the 60-and 100-μm band observations. The 60-μm band emission is a sufficiently good tracer of the thermal component of the radio continuum emission that it can be used to separate this from the synchrotron component. This technique is applied first to the identification of new supernova remnant candidates from the Haynes et al. survey and secondly to the separation of the emission of the all-sky survey of Haslam et al. into its thermal and synchrotron components.

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