What can Polar Rings Tell us about the Shapes of Dark Matter Halos?

Details What can Polar Rings Tell us about the Shapes of Dark Matter Halos? What can Polar Rings Tell us about the Shapes of Dark Matter Halos?

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sgdh.conf..178s&link_type=abstract

THE SHAPES OF GALAXIES AND THEIR DARK HALOS. Proceedings of the Yale Cosmology Workshop. Held 28-30 May 2001 in New Haven, Conne

Physics

7

Scientific paper

A polar ring galaxy has a ring or disk of dust, gas and stars orbiting almost over the pole of a central early-type galaxy. Measuring orbital speeds in the ring and the central object thus probes two roughly perpendicular planes. This can give a sensitive indication of how flattened the galactic mass distribution, which includes the unseen halo, must be. If the dark halos of polar ring systems are typical, the dark halos of galaxies range from nearly round, to being so flat that they approach the boundary of dynamical stability.

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