Unveiling the largest structures in the nearby Universe: Discovery of the Quipu superstructure
Hans Boehringer, Gayoung Chon, Joachim Truemper, Renee C., Kraan-Korteweg, Norbert Schartel

TL;DR
This paper identifies and characterizes the largest known cosmic structures, called Quipu, using galaxy cluster data, and discusses their implications for cosmology, including effects on the CMB and galaxy evolution.
Contribution
First all-sky assessment of superstructures between 130 and 250 Mpc, discovering the largest structure, Quipu, and analyzing its cosmological and astrophysical significance.
Findings
Largest structure, Quipu, exceeds 400 Mpc in length.
Quipu contains about 45% of galaxy clusters and 25% of matter.
Detected a low-significance integrated Sachs-Wolfe effect signal in Planck data.
Abstract
For a precise determination of cosmological parameters we need to understand the effects of the local large-scale structure of the Universe on the measurements. They include modifications of the cosmic microwave background, distortions of sky images by large-scale gravitational lensing, and the influence of large-scale streaming motions on measurements of the Hubble constant. The streaming motions, for example, originate from mass concentrations with distances up to 250 Mpc. In this paper we provide the first all-sky assessment of the largest structures at distances between 130 and 250 Mpc and discuss their observational consequences, using X-ray galaxy clusters to map the matter density distribution. Among the five most prominent superstructures found, the largest has a length longer than 400 Mpc with an estimated mass of about 2 10e17 Msun. This entity, which we named Quipu, is the…
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Taxonomy
TopicsHistory and Developments in Astronomy · Astronomy and Astrophysical Research · Stellar, planetary, and galactic studies
