Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.331..685m&link_type=abstract
Nature (ISSN 0028-0836), vol. 331, Feb. 25, 1988, p. 685-687. NSF-supported research.
Astronomy and Astrophysics
Astronomy
20
Astronomical Photometry, Galactic Clusters, Polarimetry, Spectrophotometry, Galactic Radiation, Gravitational Lenses, Star Formation, Synchrotron Radiation
Scientific paper
There have been various conjectures about the nature of the luminous arcs discovered in two clusters of galaxies. Some of these unusual features are that they are: (1) images of distant objects formed by a gravitational lens generated by the visible clusters of galaxies; (2) regions of star formation stimulated by the passage of a shock front produced by a central (now extinguished) quasi-stellar object; (3) light echoes of a previously bright object at the centre; or (4) long arcs of stars tidally stripped from galaxies in the clusters. The authors present new observations which restrict the range of possibilities, by eliminating (2), (3) and (4), even if they do not lead to a unique interpretation.
Goodrich Robert W.
Miller Jeffrey S.
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