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Astronomers have discovered a new super cluster



Astronomers have discovered a new super cluster

A color image of a galaxy density map with a redshift of 0.36 from eROSITA̵

7;s Hyper Suprime-Cam (HSC). The white circles mark the locations of the eight galaxy clusters forming the new supercluster. Image source: Ghirardini et al., 2020.

By analyzing data from the eROSITA Equator Final In-depth Survey (eFEDS), an international team of astronomers discovered a new super cluster. The newly discovered structure consists of eight galaxy clusters. The discovery was reported in a paper published on the arXiv preprint server on December 21.

From the largest known structures in the universe, superclusters contain structures with different mass ranges, from large and dense clusters of galaxies to low-density bridges, filaments and pieces of matter. In order to improve our understanding of the formation and evolution of large cosmic filaments, it may be necessary to discover and study superclusters in detail.

Now, a group of astronomers led by Vittorio Ghirardini of the Max Planck Institute for Extraterrestrial Physics in Garching, Germany, report the discovery of a new supercluster. The structure was determined in its Performance Verification (PV) stage through eFEDS surveys.

“We analyze 140 degrees2 The eROSITA Equator Final Depth Survey (eFEDS) field has a nominal depth of approximately 2.3 ks during the performance verification stage. In this field, we discovered a previously unknown supercluster. “The astronomer wrote in the paper.

The super cluster is composed of 8 galaxy cluster chains with a redshift of 0.36. Observations indicate that the northernmost cluster of the structure is undergoing large-scale off-axis merger activities. Optical and X-ray data indicate that it is a triple merging system with double merging and pre-merging.

The cluster named eFEDS J093513.3 + 004746 located in the north of the super cluster is the cluster with the heaviest weight and the largest luminescence among the eight clusters. It is also one of the heaviest and most luminous clusters in the entire eFEDS field. Its mass is calculated to be 580 trillion solar masses.

eFEDS J093546.4-000115 and eFEDS J093543.9-000334 are the smallest star clusters in this super cluster, with a solar mass of approximately 130 trillion. The masses of the remaining five star clusters are estimated to be between 140 and 250 trillion solar masses.

In addition, data shows that there are two radio artifacts in the northern and southeastern regions of the northernmost cluster, and the radio halo has become longer, which also supports the ongoing merger activities.

“The presence of a slender radio halo connecting two radio relics in eFEDS J093513.3 + 004746 and eFEDS J093510.7 + 004910 indicates that the cluster is undergoing a major merger. This is supported by the galaxy density contour map, which shows The two peak astronomers explained.

Overall, the research report shows that the X-ray characteristics of the eight clusters forming the new super cluster are similar to the general eFEDS cluster. In addition, their morphological characteristics are also consistent with the samples of more than 300 clusters identified by eFEDS.


Radio relics found in nearby galaxy clusters


More information:
Super clusters found in the final survey of eROSITA’s equatorial depth: X-ray characteristics, halos and double artifacts, arXiv: 2012.11607 [astro-ph.CO] arxiv.org/abs/2012.11607

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Citation: The new supercluster discovered by astronomers (December 29, 2020) will be retrieved from https://phys.org/news/2020-12-supercluster-astronomers.html on December 29, 2020

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