Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...226...45h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 226, no. 1, Dec. 1989, p. 45-56.
Astronomy and Astrophysics
Astrophysics
44
Galactic Clusters, Galactic Nuclei, Gravitational Lenses, Mass Distribution, Analytic Functions, Astronomical Models, Brightness Distribution, Cosmology
Scientific paper
The use of observations of giant luminous arcs for determining the mass distribution inside distant cluster cores is shown using lensing equations of a multipoint mass model which accounts for the observed arc properties; for given source and lens redshifts, the analytical equations of this model depend only on the lens masses. From these equations, the arc thickness is found to be 1/2 the virtual source size, explaining the thinness of the arcs. A more general lensing model is proposed, where the lensing objects (galaxies and groups and clusters of galaxies) follow the r exp 1/4 law. It is shown that the numerical simulations presented reproduce all the gravitational images, including the arcs, found in the cores of the A 370 and Cl 2244 - 02 clusters.
Hammer Francçois
Rigaut Francois
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