Computer Science
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........17r&link_type=abstract
Thesis (PH.D.)--THE UNIVERSITY OF CHICAGO, 1995.Source: Dissertation Abstracts International, Volume: 56-12, Section: B, page: 6
Computer Science
1
Scientific paper
Spiral galaxies are often pictured as stately pinwheels rotating quietly in space, subject to some warping but basically well-behaved. In fact, they exist in a very dynamic environment and are not nearly so simple as they might outwardly appear. There is now strong theoretical evidence to suggest that the massive dark halos which surround spirals oscillate in normal modes. If this is so, then a halo's gravitational potential will carry the embedded spiral disk along with it, adding a radial component to velocities that are normally thought of as purely circular. Standard models for disk galaxies do not take this into account. We analyze kinematic data for six galaxies and explicitly look for evidence of large-scale (global) radial flows. We find nothing that rules out such a velocity component, but also nothing which strongly confirms its presence. In particular, warps, which have a velocity signature similar to radial oscillations, remain a competitive model even where there is no visible evidence for warping. Nevertheless, given the theoretical prediction of radial oscillations in the embedding potential, we propose that current tilted -rings models for warped spirals are incomplete; adding to the fits a single free parameter per ring--the lowest -order (symmetric) radial velocity--would be a valuable improvement.
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