Is El Gordo's Collision Velocity Challenging ΛCDM?

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SUMMARY

The discussion centers on the collision velocity of the El Gordo galaxy cluster and its implications for the ΛCDM cosmological model. Recent updates to El Gordo's mass estimate have reduced tension with ΛCDM, yet simulations indicate that a significantly slower collision velocity is inconsistent with observed data. The findings challenge the ΛCDM framework, as hundreds of simulations confirm that El Gordo's appearance cannot be reconciled with lower collision velocities. Key references include the latest paper published in the Astrophysical Journal and previous studies on the Bullet Cluster and MOND.

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  • Experience with observational data analysis from X-ray telescopes like Chandra
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  • Review the latest findings on El Gordo's mass estimates
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Astronomers, astrophysicists, and researchers interested in cosmology, particularly those studying galaxy cluster collisions and their implications for theoretical models like ΛCDM.

pinball1970
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TL;DR
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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