Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...54...19v&link_type=abstract
Astronomy and Astrophysics Supplement, Vol.54:1, P. 19, 1983
Astronomy and Astrophysics
Astrophysics
28
Scientific paper
Results of a 21 cm HI line study of five binary galaxies observed in the 21 cm HI line with the WSRT are presented. All ten galaxies were detected in HI, and systemic velocities and rotation curves were determined. The results are discussed in terms of a point mass model for the orbital motion in the pair. Only in the case of the pair NGC 4016/4017 a minimum orbital mass was found which did not exceed the sum of the individual masses. For the other four pairs the individual masses are not sufficient to account for the observed radial velocity differences. This suggests the presence of dark matter in the orbiting systems outside the radii of the individual galaxies. In two galaxies, NGC 4625 and NGC 4017, the HI diameter exceeds the optical one by at least a factor 3. In the case of NGC 4017 the HI distribution is very suggestive of interaction with the companion.
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