The dark halo of the polar-ring galaxy NGC 4650A

Details The dark halo of the polar-ring galaxy NGC 4650A The dark halo of the polar-ring galaxy NGC 4650A

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..408s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Oct. 1, 1990, p. 408-418. Research supported by the Kerkhof-Bosscha Fo

Astronomy and Astrophysics

Astrophysics

101

Elliptical Galaxies, Galactic Bulge, Galactic Rotation, Galactic Structure, H Alpha Line, Halos, Luminous Intensity

Scientific paper

By analyzing the rotation of its central disk and outer polar ring, limits are placed on the flattening of the unseen halo of the galaxy NGC 4650A. A model consisting of a bulge, disk, axisymmetric dark halo, and massive polar ring is fitted to both rotation curves, and it is shown that the observations are consistent with a range of halo flattening, from spherical to as flat as an E8 elliptical galaxy. The best fits are obtained for dark halo flattenings in the range E3-E7. The substantial mass of the ring is probably responsible for a characteristic 'wiggle' in the polar rotation curve; fits to this feature suggest that there may be considerably more mass in the ring than has been reported from neutral hydrogen measurements.

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