surveys D. Russeil , Q. A. Parker ,, PASA, 18 (1), in press.
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Conclusion
The combination of the AAO/UKST and Marseille H
surveys can provide a more complete description of Southern Galactic Plane H emission than is possible with each survey seperately. The important gains that come from combining the high resolution and large angular field maps of the AAO/UKST H survey with the velocity information revealed with the MHS has been illustrated in this paper by the new results obtained in the galactic direction l=298
. The MHS provides not only velocity information but also allows the detection of the diffuse ionized component and more uniform gas layers which are not readily detectable from the AAO/UKST H films. In parallel the AAO/UKST survey allows detection of numerous new PNe candidates and faint compact HII regions over the entire southern GP, together with the study of their spatial distribution relative to more extended structures (SNR filaments, shells, loops, bubbles etc). This should allow us to probe the physical environment of star formation and evolution.
The combined qualities of the AAO/UKST and MHS H surveys in delineating and unravelling Galactic structure, especially when compared with surveys at other wavelengths (e.g. CO, radio, MIR), should help us to solve several key problems in the study of our galaxy. These include departures from circular rotation, the distance ambiguity problem and the limit and extent of star-forming complexes. We should also be able to estimate the input energy of the sources of ionisation which can influence the kinematics, ionisation and composition of the ISM on medium scales.
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