The Dynamics of the Outer Galaxy from HI Column Densities

Details The Dynamics of the Outer Galaxy from HI Column Densities The Dynamics of the Outer Galaxy from HI Column Densities

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..317..279f&link_type=abstract

Milky Way Surveys: The Structure and Evolution of our Galaxy, Proceedings of ASP Conference #317. The 5th Boston University Ast

Astronomy and Astrophysics

Astrophysics

Scientific paper

Models of the smooth large-scale radial distribution of the column depth of HI in the thin disk are used to found a new technique of mapping the velocity field of the Outer Galaxy in the second quadrant. The results show common features across this quadrant: a) locally (r≤ 2 kpc), Galactic HI obeys a flat rotation law (with R0=8 kpc & v0=220 km s-1) b) beyond r=2 kpc, velocities of HI in the plane (|b|≤ 5°) show pronounced deviation from velocity fields predicted by flat circular rotation, and c) towards relatively high latitudes (|b|> 5°), the Galactic HI exhibits ``normal'' behaviour, with observed velocities congruent with those predicted by flat circular rotation.

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