Kavli Affiliate: Michael McDonald
| First 5 Authors: Ben Forrest, Brian C. Lemaux, Ekta Shah, Priti Staab, Ian McConachie
| Summary:
Motivated by spectroscopic confirmation of three overdense regions in the
COSMOS field at $zsim3.35$, 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 $1.35times 10^{15}$~M$_odot$, and is modeled to virialize
at $zsim1.5-2.0$. These structures contain ten overdense peaks with $>5sigma$
overdensity separated by up to 70 cMpc, suggestive of a proto-supercluster
similar to the Hyperion system at $zsim2.45$. 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.
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