Abstract
Distant (z≳0.6) dusty star-forming galaxies and their gravitationally lensed images are relatively much brighter in the mm/sub-mm waveband as compared with the optical/near-infrared waveband. Hence the strongly-magnified lensed images of distant galaxies at the Einstein radius of a lensing cluster are expected to be very bright in the mm/sub-mm waveband, and so could introduce significant source confusion noise into observations of the Sunyaev-Zel’dovich (SZ) effect on scales similar to the Einstein radius. The properties of these lensed images, and hence limits to the form of evolution of distant star-forming galaxies, could be inferred from a careful analysis of the confusion noise expected and a set of data on the mm/sub-mm-wave SZ effect.
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