WARPS, Polar Rings and High-Velocity Clouds

Details WARPS, Polar Rings and High-Velocity Clouds WARPS, Polar Rings and High-Velocity Clouds

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004assl..312..273s&link_type=abstract

High Velocity Clouds. Edited by Hugo van Woerden, Kapteyn Institute, Groningen, The Netherlands; Bart P. Wakker, University of W

Astronomy and Astrophysics

Astrophysics

5

Scientific paper

Both in warped disk galaxies and in polar ring systems, matter at the largest radii appears to have settled into near-circular orbits, that are tilted away from the equatorial plane of the inner galaxy. In both warps and polar rings, the outer material is largely gaseous, and seems to be less advanced in its star forming life than the inner parts of the system. The disks of most spiral galaxies are warped. Recent work shows no easy path to exciting warps to the amplitude that we now observe, so perhaps the outer warped region is a later addition. In polar ring systems, the outer ring is always more gas-rich than the inner galaxy, and appears to have formed a larger fraction of its stars more recently. The rings are probably a relic of infall or accretion, which perhaps took place many gigayears ago, when gas was more plentiful in the cosmos. An astronomer in a forming polar ring system would have observed an amazingly profuse system of HVCs, bringing in as much baryonic matter as the original galaxy contained.

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