A High-Resolution Longitude-Velocity Study of the Galactic Midplane

Details A High-Resolution Longitude-Velocity Study of the Galactic Midplane A High-Resolution Longitude-Velocity Study of the Galactic Midplane

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.5002g&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #50.02; Bulletin of the American Astronomical Society, Vol. 34, p.1187

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The global distribution of neutral atomic hydrogen (HI) is a sensitive probe of Galactic structure. Single dish 21cm studies have revealed large-scale phenomena like the Galactic warp and the flaring of the HI disk, but limited angular resolution has prevented the examination of features smaller than a few hundred parsecs in the outer parts of the disk. We are conducting a new investigation of the structure of the Galactic disk using 21cm synthesis data from the Canadian Galactic Plane Survey. The CGPS resolution of 1 arcminute permits a much more detailed examination of Galactic HI structure. We use this resolution to define the HI midplane as a surface in (l,b,v) space with the full precision allowed by the CGPS data. This determination allows us to extract high-resolution longitude-velocity diagrams passing through the true midplane of the Galaxy and at fixed angles offset from it. Applications of our results include the study of new small-scale features of Galactic structure, kinematics of HI clouds in the disk potential, and establishing the context of HI absorption features used to probe neutral gas properties. This work is supported by a grant from the Natural Sciences and Engineering Research Council of Canada.

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