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Bourke, S. Toft, V. Smolcic","submitted_at":"2014-12-11T20:59:59Z","abstract_excerpt":"We study the physical properties of a sample of 6 SMGs in the COSMOS field, spectroscopically confirmed to lie at z>4. We use new GMRT 325 MHz and 3 GHz JVLA data to probe the rest-frame 1.4 GHz emission at z=4, and to estimate the sizes of the star-forming (SF) regions of these sources, resp. 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