2024/11/11 by Michael Rosenthal, Rosenthal, Michael J. Nicandro, A. J. Barger +9
Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2411.07291
openalex publication_date 2024/11/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present the results of a Keck and NOEMA spectroscopic survey of 507 galaxies, where we confirm the presence of two massive overdensities at z = 3.090 - 3.110 and z = 3.133 - 3.155 in the neighborhood of the GOODS-N, each with over a dozen spectroscopically confirmed members. We find that both of these have galaxy overdensities of NIR-detected galaxies of δ\rm gal, obs = 6 - 9 within corrected volumes of (6 - 7) × 103~\rm cMpc3. We estimate the properties of the z = 0 descendants of these overdensities using a spherical collapse model and find that both should virialize by z ≃ 0.5 - 0.8, with total masses of M\rm tot ≃ (6 - 7) × 1014~\rm M_\odot. The same spherical collapse calculations, as well as a clustering-of-clusters statistical analysis, suggest a >80% likelihood that the two overdensities will collapse into a single cluster with M\rm tot = (1.0 - 1.5) × 1015~\rm M_\odot by z ∼ 0.1-0.4. The z = 3.14 substructure contains a core of four bright dusty star-forming galaxies with Σ\rm SFR = 2700 ± 700~\rm M_\odot~\rm yr-1 in a volume of only 280 \rm cMpc3.