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Abell 2052: A Galaxy Cluster Gets Sloshed
Abell 2052
Abell 2052

  • The hot gas in the galaxy cluster Abell 2052 is being sloshed back and forth like wine in a glass.

  • The sloshing was set in motion when a small cluster smashed into the larger central one.

  • The large spiral structure on the outside of the image was also caused by that off center collision.

  • Sloshing of hot gas like this can affect how the giant elliptical galaxy and its supermassive black hole at the center grow.

Like wine in a glass, vast clouds of hot gas are sloshing back and forth in Abell 2052, a galaxy cluster located about 480 million light years from Earth. X-ray data (blue) from NASA's Chandra X-ray Observatory shows the hot gas in this dynamic system, and optical data (gold) from the Very Large Telescope shows the galaxies. The hot, X-ray bright gas has an average temperature of about 30 million degrees.

A huge spiral structure in the hot gas - spanning almost a million light years - is seen around the outside of the image, surrounding a giant elliptical galaxy at the center. This spiral was created when a small cluster of galaxies smashed into a larger one that surrounds the central elliptical galaxy.

As the smaller cluster approached, the dense hot gas of the central cluster was attracted to it by gravity. After the smaller cluster passed the cluster core, the direction of motion of the cluster gas reversed and it traveled back towards the cluster center. The cluster gas moved through the center again and "sloshed" back and forth, similar to wine sloshing in a glass that was jerked sideways. The sides of the glass push the wine back to the center, whereas in the cluster the gravitational force of the matter in the clusters pulls it back. The sloshing gas ended up in a spiral pattern because the collision between the two clusters was off-center.

X-ray
Wine sloshing in a glass
Wine sloshing backwards and forwards in a glass provides a small-scale analogy to hot gas sloshing backwards and forwards, over vast scales, in a galaxy cluster.
(Credit: Markevitch & Vikhlinin (2007))

This type of sloshing in Abell 2052 has important physical implications. First, it helps push some of the more dense, cooler gas located in the center of the cluster -- where temperatures are only about 10 million degrees -- farther away from the core. This helps prevent further cooling of this gas in the core and could limit the amount of new stars being formed in the central galaxy. Sloshing motions like those seen in Abell 2052 also redistribute heavy elements, like iron and oxygen, which are forged in supernova explosions. These elements are used in the future generations of stars and planets and are necessary for life as we know it.

Chandra's observation of Abell 2052 was particularly long, lasting more than a week. Such a deep observation was necessary to detect all of the details in this image. Even then, processing to emphasize more subtle features was necessary to reveal the outer spiral structure.

In addition to the large-scale spiral feature, the deep Chandra observation reveals exquisite detail in the cluster center related to outbursts from the central supermassive black hole. The Chandra data show clear bubbles evacuated by material blasted away from the black hole, which are surrounded by dense, bright, cool rims. As with the sloshing, this activity helps prevent cooling of the gas in the cluster's core, setting limits on the growth of the giant elliptical galaxy and its supermassive black hole.

These results were published in the August 20, 2011 issue of The Astrophysical Journal. The authors were Elizabeth Blanton of Boston University, Boston, MA; Scott Randall of the Harvard-Smithsonian Center for Astrophysics in Cambridge, MA; Tracy Clarke of the Naval Research Laboratory in Washington DC; Craig Sarazin of the University of Virginia in Charlottesville, VA; Brian McNamara of the University of Waterloo in Waterloo, Canada; Edmund Douglass of Boston University and Michael McDonald of the University of Maryland, College Park, MD.

Fast Facts for Abell 2052:
Credit  X-ray: NASA/CXC/BU/E.Blanton; Optical: ESO/VLT
Release Date  December 13, 2011
Scale  Image is 9.3 arcmin across (1.27 million light years across)
Category  Groups & Clusters of Galaxies
Coordinates (J2000)  RA 15h 16m 44.40s | Dec +07 01' 20.00"
Constellation  Serpens
Observation Date  11 pointings between Sept 2000 and June 2009
Observation Time  183 hours 53 min (7 days 15 hours 53 min)
Obs. ID  890, 5807, 10477-10480, 10879, 10914-10917
Instrument  ACIS
References Blanton, E. et al, 2011, ApJ 737:99
Color Code  X-ray (Blue); Optical (Orange)
Optical
X-ray
Distance Estimate  About 480 million light years
Visitor Comments (3)

Absolutely Gorgeous!

Posted by PK on Tuesday, 05.22.12 @ 15:21pm


The picture, in my opinion, hint a different interpretation: we are looking inside a spiral jet whose core AGN is inside the cluster center..the image in large scale remind the probable behavior of GRB whose precessing jets are sometimes blazing the observer as rapid flare..

Regards Daniele Fargion

Posted by Daniele Fargion on Wednesday, 03.7.12 @ 10:10am


This is interesting.

Posted by john on Thursday, 12.15.11 @ 12:24pm


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