Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396...10k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. 10-19. Research supported by NATO and Charles
Astronomy and Astrophysics
Astrophysics
54
Dark Matter, Galactic Clusters, Gravitational Lenses, Mass To Light Ratios, Red Shift, Arcs, Catastrophe Theory, Taylor Series, Visible Spectrum
Scientific paper
The long 'straight arc' observed in the cluster of galaxies Abell 2390 is investigated. The formation of straight arcs is considered analytically in terms of fold and cusp catastrophes and two singular sections of a cusp, the 'beak-to-beak' and 'lips' 'calamities'. It is shown that a single cusp always produces curved images, while straight images can be formed by fold catastrophes and these two types of calamities. These results are used to derive detailed models for the observed features. It is found to be possible to derive a fold model by introducing a sheetlike dark mass distribution. Beak-to-beak models must postulate either an unseen cluster to balance Abell 2390 or an unseen galaxy to offset the closest cluster galaxy. The latter model is more structurally stable and consistent with the optical and IR data.
Blandford Roger. D.
Kassiola Aggeliki
Kovner Israel
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