ar X iv : a st ro - p h / 03 02 19 6 v 1 1 1 Fe b 20 03 CO Emission from z > 3 Radio Galaxies Carlos
نویسندگان
چکیده
We report on the detection of the CO(4−3) line with the IRAM Plateau de Bure Interferometer in two z > 3 radio galaxies, doubling the number of successful detections in such objects. A comparison of the CO and Lyα velocity profiles indicates that in at least half of the cases, the CO is coincident in velocity with associated HI absorption seen against the Lyα emission. This strongly suggests that the CO and HI originate from the same gas reservoir, and could explain the observed redshift differences between the optical narrow emission lines and the CO. The CO emission traces a mass of H2 100−1000 times larger than the HI and HII mass traced by Lyα, providing sufficient gas to supply the massive starbursts suggested by their strong thermal dust emission.
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