‘The Fat One’: Largest, Hottest And Brightest X-ray Galaxy Cluster Ever Found In Distant Universe

A few years ago, astronomers have focused their attention on an extremely hot, massive young galaxy cluster, officially known as ACT-CLJ0102-4915.
This gigantic galaxy cluster has been nicknamed ‘El Gordo’ (‘the Fat One’ in Spanish) because it is the largest, hottest, and X-ray brightest galaxy cluster ever seen in the distant Universe!
‘The Fat One’ contains the mass of a staggering three million billion Suns and it has been studied with the help of ESO’s Very Large Telescope (VLT) in the Atacama Desert in Chile along with NASA’s Chandra X-ray Observatory and the Atacama Cosmology Telescope.
It was also determined that ‘the Fat One’, is actually composed of two galaxy clusters colliding at millions of kilometers per hour.

El Gordo is so far away from Earth that its light has travelled for seven billion years to reach us.
“This cluster is the most massive, the hottest, and gives off the most X-rays of any cluster found so far at this distance or beyond,” said Felipe Menanteau of Rutgers University, who led the study.
“We devoted a lot of our observing time to El Gordo, and I’m glad our bet paid off and we found an amazing cluster collision.”

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