A Kinematical Study of Old HII Regions and Optical Counterpart to the DRAO Canadian Galactic Plane Survey

Steve Godbout , Gilles Joncas , Laurent Drissen, PASA, 15 (1), 60
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Conclusion

Throughout this project, many ionized nebulae will be studied using the instruments described earlier. Our first target is the W4/W5 complex. A total of 10 data cubes are needed to cover the object. The CGPS will cover an extremely large area of the Galactic plane and obviously, a 32' field will not be enough to cover the same spatial extent. Eastern Canada weather provides us with around 90 clear nights per year. This is why our project will be limited to peculiar and interesting objects. It is hard to know exactly how many of these will be observed since they have to be catalogued by the CGPS consortium first. However, within the guidelines established earlier, two more old HII regions are already on our list, bringing the total of expected data cubes to 28. Weather permitting, two cubes per observing night should be acquired but a more conservative estimate, for a 6 week/year period, is a total of about 14 cubes/year. We expect to have, on completion of the project five years from now, the most complete and detailed pictures and models for HII region dynamics and their interactions with the local neutral gas. To emphasize the type of data we will get from these studies, we include, in Figure 2, a preliminary, grey level coded, velocity field for the ionized gas in the region of the Wolf-Rayet star MC46 from the already available M33 data.

  figure39
Figure 2: Velocity field of the ionized gas in the region near Wolf-Rayet star MC46 in M33. Lighter shades indicates receding gas. Velocities Range from 10 to 45 km stex2html_wrap_inline152 in M33's frame of reference. North is up and east is left


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Contents Page: Volume 15, Number 1

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