HI Surface Density and Spiral Structure

Details HI Surface Density and Spiral Structure HI Surface Density and Spiral Structure

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.7203l&link_type=abstract

American Astronomical Society, AAS Meeting #212, #72.03; Bulletin of the American Astronomical Society, Vol. 40, p.260

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The HI integrated surface density is a good tracer of the spiral structure because spiral arms are associated with atomic gas density enhancements. In this talk, I will summarize how maps of HI outer Galaxy spiral structure have improved over the last 50 years, and present the current state-of-the-art maps. I will describe other large-scale features of the outer Galaxy, such as the warp and flaring of the HI disk, and discuss how these features interact with the spiral arms. I will also summarize difficulties that still plague outer Galaxy spiral structure maps, such as gaps in our knowledge of the outer Galaxy rotation structure, and I will briefly speculate on ways to further improve our maps.

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