Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-06-30
Astronomy and Astrophysics
Astrophysics
28 pages, accepted by AJ. New HI profile increases the compatibility of NGC 3109 rotation curve with MOND
Scientific paper
10.1086/319944
New high resolution CFHT Fabry-Perot data, combined with published VLA 21 cm observations are used to determine the mass distribution of NGC 3109 and IC 2574. The multi-wavelength rotation curves allow to test with confidence different dark halo functional forms from the pseudo-isothermal sphere to some popular halo distributions motivated by N-body simulations. It appears that density distribution with an inner logarithmic slope <= -1 are very hard to reconcile with rotation curves of late type spirals. Modified Newtonian Dynamics (MOND) is also considered as a potential solution to missing mass and tested the same way. The new higher resolution data show that MOND can reproduce in details the rotation curve of IC 2574 but confirm its difficulty to fit the kinematics of NGC 3109.
Amram Philippe
Blais-Ouellette Sebastien
Carignan Claude
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