Extreme Star Formation and AGN Activity in a Massive Protocluster at z=5.3

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We report the discovery and spectroscopic confirmation of a massive (>4x10^11) proto-cluster at z=5.3 in the COSMOS field. The proto-cluster extends over >13 Mpc and contains an >11 times over-density of L>L* Lyman-break galaxies at its core. This region contains both a luminous x-ray detected quasar and an extreme star-bursting galaxy containing a significant reservoir of cold molecular gas. This object provides the first opportunity to study the early phases of galaxy cluster formation.

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