Pandora's cluster was discovered by researchers.

An excerpt of the analyzed field of view focused on the cluster of Pandora as observed with the Magellan/MegaCam. Credit: Abriola et al., 2024.

Using the Magellan telescopes in Chile, Italian astronomers have observed a giant galaxy cluster called Abel 2744, also known as Pandora’s cluster. The results of the observation campaign are presented in A paper Published on the preprint server on February 13. arXivprovide more insight into the properties of this cluster.

A galaxy cluster consists of thousands of gravitationally bound galaxies. They are formed by the accretion and collapse of smaller substructures and are gravitationally bound structures in the universe. Therefore, they can serve as excellent laboratories for the study of galaxy evolution and cosmology.

About 4 billion light-years from Earth, the Pandora Cluster is a giant galaxy cluster estimated to be about 4 trillion times the mass of the Sun. It appears to be the result of the simultaneous accretion of at least four separate, smaller galaxy clusters that occurred over a period of 350 million years.

Previous observations of the Pandora cluster have revealed that it exhibits one of the most complex merger events, seen in both radio and X-ray data. The cluster also caught the attention of a team of astronomers led by David Abriola of the University of Milan in Italy when they decided to investigate it with the MegaCam – a large mosaic CC on one of the Magellan telescopes. D. Camera.

“In this paper, we present an improved WL. [weak lensing] Analysis of the galaxy cluster Abell 2744 using deep Magellan/MegaCam multiband imaging data covering an approximately 31′ × 33′ field of view. For our study, we applied a pipeline based on two completely new softwares, mccd and ngmix. For PSF [point spread function] reconstruction and shape measurement, respectively,” the researchers wrote in the paper.

First, the new observations found that the Pandora cluster has an estimated total mass of about 2.56 quadrillion. Within 7.66 million From the brightest cluster galaxy in the southwest. This makes it one of the biggest. discovered so far.

The reconstructed surface mass distribution revealed the presence of three high-density peaks, substructures in the interior of the Pandora cluster. One, with high density and a signal-to-noise ratio of 14.0, is in the southeast part of the cluster, very close to the brightest cluster galaxy, while the other two are found in the northwest corner.

According to the paper’s authors, these results confirm that the cluster is not quiescent but undergoing a complex merger, as suggested by previous studies. This is also confirmed by a new high-precision strong lensing analysis of the cluster’s central region based on data from the James Webb Space Telescope (JWST), he added.

More information:
David Abriola et al., An Improved Magellan Weak Lensing Analysis of the Galaxy Cluster Able 2744, arXiv (2024). DOI: 10.48550/arxiv.2402.08364

Journal Information:

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Reference: Pandora’s cluster explored by researchers (2024, February 19) Retrieved February 19, 2024, from https://phys.org/news/2024-02-pandora-cluster-explored.html.

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