A proto-cluster at z=2.45
Abstract
We present the spectroscopic confirmation of a z=2.45 proto-cluster. Its member galaxies lie within a radius of 1.4Mpc (physical) on the sky and within v 700km/s along the line of sight. We estimate an overdensity of 10, suggesting that the structure has made the turn-around but is not assembled yet. Comparison to the Millennium simulation suggests that analogous structures evolve into 1014-1015M/h type dark matter haloes by z=0 qualifying the notion of "proto-cluster". The search for the complete census of mock progenitor galaxies at z2.5 of these massive z=0 mock clusters reveals that they are widely spread over areas with a diameter of 3-20Mpc. This suggests that the optical selection of such proto-clusters can result in a rich diversity regarding their z=0 descendants. We also searched for signs of environmental differentiation in this proto-cluster. Whilst we see a weak trend for more massive and more quiescent galaxies in the proto-cluster, this is not statistically significant.
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.