Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-05-13
Astronomy and Astrophysics
Astrophysics
4 pages, Submitted to MNRAS Letters
Scientific paper
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 ${\rm M_v \sim -26}$, and a star-formation rate of $4700 {\rm M_{\odot} yr^{-1}}$, making it the most ``active'' star-forming galaxy. This proto-galaxy is observed to lie close $\left(\sim 6\scnp\right)$ 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.
Lewis Geraint F.
Williams Liliya L. R.
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