Is El Gordo's Collision Velocity Challenging ΛCDM?

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TL;DR Summary
Data from Chandra X ray telescope, show ΛCDM tension with El Gordo large galaxy cluster collision.
The article is here https://phys.org/news/2023-09-titanic-galaxy-cluster-collision-early.html

"The results of our previous study were questioned by some scientists once an updated mass estimate for El Gordo was published and came in slightly lower. This does reduce the tension with ΛCDM, but it is still highly significant for any plausible collision velocity. Hundreds of detailed simulations show that El Gordo cannot look like the photos with a much slower collision velocity that could plausibly arise in ΛCDM."

Paper here https://iopscience.iop.org/article/10.3847/1538-4357/ace62a
Previous paper here from 2020 with a discussion of the bullet cluster and MOND (4.3)

Previous data from Webb on the same issue. https://iopscience.iop.org/article/10.3847/2041-8213/ac9a50

Info on Chandra https://en.m.wikipedia.org/wiki/Chandra_X-ray_Observatory
 
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Related to Is El Gordo's Collision Velocity Challenging ΛCDM?

1. What is El Gordo's Collision Velocity?

El Gordo is a galaxy cluster located about 7 billion light-years away from Earth. Its collision velocity refers to the speed at which the two subclusters within El Gordo are merging together.

2. How does El Gordo's Collision Velocity compare to other galaxy clusters?

El Gordo's collision velocity is one of the highest ever observed for a galaxy cluster. It is estimated to be about 2,000 kilometers per second, which is about five times faster than the average collision velocity of other galaxy clusters.

3. What is ΛCDM?

ΛCDM stands for Lambda Cold Dark Matter and is a cosmological model that describes the evolution of the universe. It is based on the theory of general relativity and includes the presence of dark energy, dark matter, and baryonic matter.

4. How does El Gordo's Collision Velocity challenge ΛCDM?

El Gordo's collision velocity challenges ΛCDM because according to this model, galaxy clusters should not be able to reach such high velocities. This has led scientists to question the accuracy and completeness of the ΛCDM model.

5. What are some proposed explanations for El Gordo's Collision Velocity?

Some scientists have proposed that the high collision velocity of El Gordo could be due to the presence of a large amount of dark matter, which would provide the necessary gravitational pull to accelerate the clusters. Others suggest that the collision could be the result of a close encounter with another galaxy cluster, or that it is simply a rare and extreme event in the evolution of galaxy clusters.

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