# Unveiling the largest structures in the nearby Universe: Discovery of the Quipu superstructure

**Authors:** Hans Boehringer, Gayoung Chon, Joachim Truemper, Renee C. Kraan-Korteweg, Norbert Schartel  
**arXiv:** [2501.19236](https://arxiv.org/abs/2501.19236)  
**Date:** 2025-01-31  
**Summary page:** https://www.summarizepaper.com/en/arxiv-id/2501.19236v1/

## Key points

- Efforts in the study of cosmic large-scale structure focus on mapping and describing individual properties of structural elements rather than just statistical descriptions.
- Superstructures like Quipu, the largest cosmic structure identified, are located at distances between 130 and 250 Mpc and contain a significant portion of galaxy clusters, galaxies, and matter in the Universe.
- These superstructures play a crucial role in influencing astrophysical processes such as galaxy formation and evolution.
- Understanding these superstructures is essential for precision tests of cosmological models and studying the environmental dependence of galaxy evolution.
- Mapping large-scale matter distribution using X-ray galaxy clusters provides valuable insights into the local Universe's density and streaming flow structure.
- Superstructures are expected to impact measurements of cosmological parameters through effects like modifications on the cosmic microwave background.
- The CLASSIX cluster survey focuses on an all-sky assessment between redshifts z = 0.03 − 0.06 using galaxy clusters as tracers with almost all-sky coverage based on X-ray detections from the ROSAT All-Sky Survey.
- Researchers have identified several prominent superstructures with similar properties observed in simulations based on Lambda-CDM cosmology models through analyzing these galaxy clusters.
- This research sheds light on the largest structures in the nearby Universe and their implications for our understanding of cosmological parameters and astrophysical processes, highlighting the complexity and richness of our Universe's large-scale structure.

## Summary

Efforts have been made in the study of the cosmic large-scale structure to map and describe individual properties of structural elements rather than just describing them statistically. This approach has led to the discovery of superstructures like Quipu, which is currently the largest cosmic structure identified. These superstructures are located at distances between 130 and 250 Mpc and contain a significant portion of galaxy clusters, galaxies, and matter in the Universe. They play a crucial role in influencing astrophysical processes such as galaxy formation and evolution. Understanding these superstructures is essential for precision tests of cosmological models and for studying the environmental dependence of galaxy evolution. The mapping of large-scale matter distribution using X-ray galaxy clusters provides valuable insights into the local Universe's density and streaming flow structure. Additionally, these superstructures are expected to impact measurements of cosmological parameters through effects like modifications on the cosmic microwave background. The study presented in this paper focuses on an all-sky assessment of the region between redshifts z = 0.03 − 0.06 using galaxy clusters as tracers. The CLASSIX cluster survey, based on X-ray detections from the ROSAT All-Sky Survey, offers a comprehensive view with almost all-sky coverage. By analyzing these galaxy clusters, researchers have identified several prominent superstructures with similar properties observed in simulations based on Lambda-CDM cosmology models. Overall, this research sheds light on the largest structures in the nearby Universe and their implications for our understanding of cosmological parameters and astrophysical processes. The discovery of Quipu and other superstructures highlights the complexity and richness of the large-scale structure of our Universe, providing valuable insights for future studies in observational cosmology.