A Giant Ring on the sky
Alexia M. Lopez, Roger G. Clowes

TL;DR
This paper reports the discovery and analysis of a large-scale ring-like structure at redshift ~0.8, supported by multiple statistical methods and evidence, suggesting a complex, overlapping cosmic feature.
Contribution
It introduces the discovery of a giant ring structure, supported by novel statistical assessments and the identification of overlapping features in large-scale cosmic data.
Findings
Two >4σ elliptical features consistent with the ring prediction and visual identification.
Significant clustering detected at scales of approximately 320 Mpc.
Random and simulated data do not replicate the observed ring features.
Abstract
We present the discovery of `A Giant Ring on the Sky' (GR); a ring-like, ultra-large-scale structure at z~0.8, located in the same field that contains the previously-documented Giant Arc (GA) and Big Ring (BR). The GR was predicted from the presence of a Northern Arc (NA) filament (noted in previous work), which looked like it could, with more or enhanced data, connect with the GA to form a giant ring that encompasses the BR. There is now much evidence to support the reality of a GR. There appear to be two overlapping versions of the GR which differ by only the left-hand-side trajectory; this branching in the LHS of the GR was identified with the FilFinder algorithm and appears to correspond to both the GR prediction (the extended, elliptical, GR from the GA+NA ellipse), and the visually-identified ellipse (the visually-impressive, almost contiguous, roughly circular, GR which is…
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