Abstract
Using the Australia Telescope Compact Array, we have detected CO (1-0) and CO (5-4) from TN J0924-2201 at z = 5.2, the most distant radio galaxy known to date. This is the second highest redshift detection of CO published so far. The CO (1-0) line emission is 250-400 km s-1 wide with a peak flux density of 520 ± 115 μJy beam-1, while the CO (5-4) line emission is 200-300 km s-1 wide with a peak flux density of 7.8 ± 2.7 mJy beam-1. Both transitions are spatially unresolved, but there is marginal evidence for spatial offsets between the CO and the host galaxy; the CO (1-0) is located 28 ± 11 kpc (45 ± 17) north of the radio galaxy, while the CO (5-4) is located 18 ± 8 kpc (28 ± 12) south of the radio galaxy. Higher spatial resolution observations are required to determine the reality of these offsets. Our result is the second detection of CO in a high-redshift galaxy without preselection based on a massive dust content.
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