Physics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989msngr..56...62g&link_type=abstract
The Messenger, vol. 56, p. 62-63
Physics
2
Clusters Of Galaxies: Luminous Arcs, Clusters Of Galaxies: Spectra
Scientific paper
In 1986, luminous arcs in two clusters of galaxies were detected; their highly elongated unusual morphology posed a problem to the nature of their origin. Whereas several interpretations have been suggested, it soon became clear that they may be the result of gravitational lensing of a background galaxy by the cluster. The gravitational lens hypothesis was confirmed for the arc in A370 when its spectrum was mea- sured; the redshift is about 0.724, i.e. roughly twice that of the cluster, which also is close to the ideal redshift for efficient lensing. The nature of the arc in CI 2244 is less clear, but from the simielongated of the morphology and colour of this arc, it is usually assumed that this is also due to lensing of a background galaxy
Giraud Edmond
Schneider Pat
Wambsganss Joachim
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