2002/03/31 by Cathryn M. Trott, R. L. Webster, Rachel L. Webster · 4 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2002.05542.x
published as Mon.Not.Roy.Astron.Soc. 334 (2002) 621 · 11 pages, 6 figures, accepted by MNRAS, in press
arxiv created 2002/06/27 · openalex publication_date 2002/08/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 ≡ 1.4rd) 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.