Motivated by spectroscopic confirmation of three overdense regions in the COSMOS field at z∼3.35, we analyze the uniquely deep multi-wavelength photometry and extensive spectroscopy available in the field to identify any further related structure. We construct a three dimensional density map using the Voronoi tesselation Monte Carlo method and find additional regions of significant overdensity. Here we present and examine a set of six overdense structures at 3.20<z<3.45 in the COSMOS field, the most well characterized of which, PCl~J0959+0235, has 80 spectroscopically confirmed members and an estimated mass of 1.35×1015~M⊙, and is modeled to virialize at z∼1.5−2.0. These structures contain ten overdense peaks with >5σ overdensity separated by up to 70 cMpc, suggestive of a proto-supercluster similar to the Hyperion system at z∼2.45. Upcoming photometric surveys with JWST such as COSMOS-Web, and further spectroscopic follow-up will enable more extensive analysis of the evolutionary effects that such an environment may have on its component galaxies at these early times.
@article{arxiv.2307.15113,
title = {Elent\'ari: A $z\sim3.3$ Proto-Supercluster in COSMOS},
author = {Ben Forrest and Brian C. Lemaux and Ekta Shah and Priti Staab and Ian McConachie and Olga Cucciati and Roy R. Gal and Denise Hung and Lori M. Lubin and Letizia P. Cassarà and Paolo Cassata and Wenjun Chang and M. C. Cooper and Roberto Decarli and Percy Gomez and Gayathri Gururajan and Nimish Hathi and Daichi Kashino and Danilo Marchesini and Z. Cemile Marsan and Michael McDonald and Adam Muzzin and Lu Shen and Stephanie Urbano Stawinski and Margherita Talia and Daniela Vergani and Gillian Wilson and Giovanni Zamorani},
journal= {arXiv preprint arXiv:2307.15113},
year = {2024}
}
Comments
Accepted for publication in MNRAS. 7 pages, 3 figures, 3 tables