Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988comap..12..233b&link_type=abstract
Comments on Modern Physics, Part C - Comments on Astrophysics (ISSN 0146-2970), vol. 12, May 1988, p. 233-244.
Astronomy and Astrophysics
Astrophysics
1
Astronomical Models, Galactic Clusters, Red Shift, Gravitational Lenses, Luminosity
Scientific paper
Research concerning giant luminous arcs in high-redshift clusters of galaxies is reviewed, arguing that the shell-type models are excluded if claims for a contrast greater than ten between the surface-brightness of the arcs and the regions encompassed by them are confirmed. In addition to the limb-brightened shell model, the gravitational lens model and the echo model are discussed. It is determined that if the brightness contrast between the arc and the interior is found to be greater than three, the source cannot be a spherical shell or a fragment of one, unless some very special physical mechanism such as stimulated emission or scattering enhances the observed contrast. If the redshift of the arc is comparable to that of the cluster, the arc cannot be a lensed galaxy, but if it is much higher, the lens model would be favored. The detection of velocity gradients along the arcs, which would be consistent with rotation would indicate an echo from a thin screen.
Braun Erez
Dekel Avishai
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