The dynamics of the outer galaxy from HI column densities

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Proceedings titleMilky Way Surveys: The Structure and Evolution of our Galaxy, Proceedings of ASP Conference
Series titleAstronomical Society of the Pacific Conference Series; Volume 317
ConferenceThe 5th Boston University Astrophysics Conference, 15-17 June 2003, Boston, MA, USA
ISBNE 978-1-58381-252-5
AbstractModels of the smooth large-scale radial distribution of the column depth of H I 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 H I obeys a flat rotation law (with R0=8 kpc & v0=220 km s−1) b) beyond r=2 kpc, velocities of H I 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 H I exhibits “normal” behavior, with observed velocities congruent with those predicted by flat circular rotation.
Publication date
AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedNo
NPARC number9720627
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Record identifierd215ba88-2225-4e2b-8db2-dfda7b4d7be2
Record created2009-07-17
Record modified2016-05-09
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