Abstract. In 2009, the Compact Array Broadband Backend (CABB) was installed on the Australia Telescope Compact Array (ATCA). ATCA/CABB offers 2 × 2 GHz instantaneous bandwidth, mm-capabilities from 16–106 GHz and versatile array configurations, making it an ideal instrument to detect and spatially resolve high-redshift molecular gas. Our team have observed a representative sample of high-redshift radio galaxies using CABB with the intention of detecting CO(1-0) (Emonts et al. 2011a,b). Here I summarise ATCA’s upgraded spectral line capabilities and present and discuss our work on molecular gas in high-redshift radio galaxies, including the detection of CO(1-0) in four z ∼ 2 radio galaxies. 1
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