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El Gordo: Monster "El Gordo" Galaxy Cluster is Bigger than Thought
El Gordo
El Gordo
El Gordo

  • Scientists who discovered this galaxy cluster in 2012 nicknamed it "El Gordo" because of its gigantic mass.

  • New data from Hubble indicate El Gordo may weigh 43 percent more than the original estimate.

  • El Gordo is the most massive, the hottest, and gives off the most X-rays of any known cluster at its distance or beyond.

  • Like the Bullet Cluster, El Gordo is the site of two galaxy clusters running into each other at several million miles per hour.El Gordo is located over 7 billion light years from Earth, meaning that it is being observed at a young age.

This is a composite image of X-rays from Chandra and optical data from Hubble of the galaxy cluster ACT-CL J0102-4915, located about 7 billion light years from Earth. This cluster has been nicknamed "El Gordo" (or, "the fat one" in Spanish) because of its gigantic mass.

Scientists first announced the discovery of El Gordo with Chandra and ground-based optical telescopes in 2012. They determined that El Gordo is the most massive, the hottest, and gives off the most X-rays of any known galaxy cluster at its distance or beyond.

New data from the Hubble Space Telescope suggests El Gordo weighs as much as 3 million billion times the mass of our Sun. This is about 43 percent higher than the original estimate based on the X-ray data and dynamical studies.

The new Hubble study determined that most of the mass is hidden away as dark matter. The location of the dark matter is mapped out in this composite in blue. Because dark matter doesn't emit any radiation, astronomers instead precisely measure how its gravity warps the images of far background galaxies like a funhouse mirror. This allowed them to come up with a mass estimate for the cluster. Chandra's X-ray data are shown in pink and these have been overlaid on optical data from Hubble that shows the individual galaxies in the cluster as well as stars in the field of view.

The X-ray image of El Gordo reveals a distinct cometary appearance. Along with the optical data, this shows that El Gordo is, in fact, the site of two galaxy clusters running into one another at several million miles per hour. This and other characteristics make El Gordo akin to the well-known object called the Bullet Cluster, which is located almost 4 billion light years closer to Earth.

As with the Bullet Cluster, there is evidence that normal matter, mainly composed of hot, X-ray bright gas, has been wrenched apart from the dark matter in El Gordo. The hot gas in each cluster was slowed down by the collision, but the dark matter was not.


Fast Facts for El Gordo:
Credit  NASA, ESA, J. Jee (Univ. of California, Davis), J. Hughes (Rutgers Univ.), F. Menanteau (Rutgers Univ. & Univ. of Illinois, Urbana-Champaign), C. Sifon (Leiden Obs.), R. Mandelbum (Carnegie Mellon Univ.), L. Barrientos (Univ. Catolica de Chile), and K. Ng (Univ. of California, Davis)
Release Date  April 3, 2014
Scale  Image is about 5 arcmin across (7.72 million light years)
Category  Groups & Clusters of Galaxies
Coordinates (J2000)  RA 01h 02m 52.50s | Dec -49° 14´ 58.00"
Constellation  Phoenix
Observation Date  3 pointings between 26 Jan 2011 and 21 Feb 2012
Observation Time  97 hours 30 min (4 days 1 hour 30 min)
Obs. ID  12258, 14022, 14023
Instrument  ACIS
Also Known As ACT-CL J0102-4915
Color Code  X-ray (Red); Optical (Red, Green, Blue); Derived Mass (Blue)
Distance Estimate  7.2 billion light years (z=0.87)
distance arrow
Visitor Comments (4)

Nice image. I was wondering about the nature of the discrete red blobs that appear from the x-ray image at various points.

Posted by Paul Schulte on Tuesday, 04.22.14 @ 23:41pm

Above is a galaxy shaped jellyfish, is a clash of stars.

Posted by wilson piriz on Wednesday, 04.16.14 @ 22:42pm

It makes one wonder what happened to it,
since that time.

Posted by Mark Ballington on Friday, 04.4.14 @ 09:58am

El Gordo is a fun name for a cluster.

Posted by Gabriel on Thursday, 04.3.14 @ 16:11pm

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