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Molecular gas in the halo fuels the growth of a massive cluster galaxy at high redshift

Pentericci, L.; Villar-Martín, M.; Dannerbauer, H. +19 more

The largest galaxies in the universe reside in galaxy clusters. Using sensitive observations of carbon monoxide, we show that the Spiderweb galaxy—a massive galaxy in a distant protocluster—is forming from a large reservoir of molecular gas. Most of this molecular gas lies between the protocluster galaxies and has low velocity dispersion, indicati…