Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 334, Issue 3, Pages 621-630Publisher
OXFORD UNIV PRESS
DOI: 10.1046/j.1365-8711.2002.05542.x
Keywords
gravitational lensing; galaxies : kinematics and dynamics; dark matter
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We determine the mass distribution of a spiral galaxy, 2237+0305, using both gravitational lensing and dynamical constraints. We find that lensing can break the disc-halo degeneracy. 2237+0305 has a submaximal disc, contributing 57+/-3 per cent of the rotational support at the disc maximum. The disc mass-to-light ratio is 1.1+/-0.2 in the I band and the bulge, 2.9+/-0.5. The dark matter halo, modelled as a softened isothermal sphere, has a large core radius (13.4+/-0.4 kpc equivalent to 1.4r(d) ) to high accuracy for the best-fitting solution. The image positions are reasonably well fitted, but require further rotation information to obtain a unique solution.
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