The Giant Proto-Galaxy cB58; an Artifact of Gravitational Lensing?
Abstract
The proto-galaxy, cB58, was discovered in the CNOC survey of cluster redshifts. Absorption features reveal that this system is at a redshift of z=2.72, implying an absolute magnitude of Mv -26, and a star-formation rate of 4700 M yr-1, making it the most ``active'' star-forming galaxy. This proto-galaxy is observed to lie close ( 6) to a central cluster galaxy at z=0.373. The X-ray properties of the cluster suggest that its mass, and therefore its lensing potential, could be greater than that found using a virial analysis. In this Letter we argue that the phenomenal properties of this proto-galaxy are due to the gravitational lensing effect of the foreground cluster, and the unlensed properties of the source are typical of high-redshift star-forming systems.
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