Bright prospects: Comparing the H-alpha survey with large-scale radio continuum emission

Astronomy and Astrophysics – Astronomy

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Hii Regions, Radio Continuum

Scientific paper

Prospects for comparisons between the AAO/UKST H-alpha survey and large-scale radio continuum emission are considered, with particular reference to the recently completed Parkes 2.4-GHz survey of the southern Galactic Plane. Both these surveys have a high sensitivity to thermal emission, and comparisons between the Parkes work and previous H-alpha surveys show many objects in common. Possibilities for new detections include: a number of new supernova remnants; the faint extensions and envelopes surrounding `classical' HII complexes, and other faint regions of thermal emission; several active HII complexes, including an outflow of ionized gas from IC 4628 and a number of bi-polar `plumes' of low-density, thermal material apparently associated with HII complexes on the Carina spiral arm.

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