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Motivated by spectroscopic confirmation of three overdense regions in theCOSMOS field at $z\sim3.35$, we analyze the uniquely deep multi-wavelengthphotometry and extensive spectroscopy available in the field to identify anyfurther related structure. We construct a three dimensional density map usingthe Voronoi tesselation Monte Carlo method and find additional regions ofsignificant overdensity. Here we present and examine a set of six overdensestructures at $3.20<z<3.45$ in the COSMOS field, the most well characterized ofwhich, PCl~J0959+0235, has 80 spectroscopically confirmed members and anestimated mass of $1.35\times 10^{15}$~M$_\odot$, and is modeled to virializeat $z\sim1.5-2.0$. These structures contain ten overdense peaks with $>5\sigma$overdensity separated by up to 70 cMpc, suggestive of a proto-superclustersimilar to the Hyperion system at $z\sim2.45$. Upcoming photometric surveyswith JWST such as COSMOS-Web, and further spectroscopic follow-up will enablemore extensive analysis of the evolutionary effects that such an environmentmay have on its component galaxies at these early times.

Elent\'ari: A $z\sim3.3$ Proto-Supercluster in COSMOS