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Hubble Views a Double Cluster of Glowing Galaxies

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Hubble Views a Double Cluster of Glowing Galaxies

A cluster of galaxies, concentrated around what appear to be two large elliptical galaxies. The rest of the black background is covered in smaller galaxies of all shapes and sizes. In the top left and bottom right, beside the two large galaxies, some galaxies appear notably distorted into curves by gravity.
This NASA Hubble Space Telescope image of Abell 3192 holds two independent galaxy clusters.
ESA/Hubble & NASA, G. Smith, H. Ebeling, D. Coe

This Hubble image features a massive cluster of brightly glowing galaxies, first identified as Abell 3192. Like all galaxy clusters, this one is suffused with hot gas that emits powerful X-rays, and it is enveloped in a halo of invisible dark matter. All this unseen material – not to mention the many galaxies visible in this image – comprises such a huge amount of mass that the galaxy cluster noticeably curves spacetime around it, making it into a gravitational lens. Smaller galaxies behind the cluster appear distorted into long, warped arcs around the cluster’s edges.

The galaxy cluster is in the constellation Eridanus, but the question of its distance from Earth is a more complicated one. Abell 3192 was originally documented in the 1989 update of the Abell catalog of galaxy clusters that was first published in 1958. At that time, Abell 3192 was thought to comprise a single cluster of galaxies, concentrated at a single distance. However, further research revealed something surprising: the cluster’s mass seemed to be densest at two distinct points rather than one. 

It was subsequently shown that the original Abell cluster is actually comprised of two independent galaxy clusters – a foreground group around 2.3 billion light-years from Earth, and another group at the greater distance of about 5.4 billion light-years from our planet. The more distant galaxy cluster, included in the Massive Cluster Survey as MCS J0358.8-2955, is central in this image. The two galaxy groups are thought to have masses equivalent to around 30 trillion and 120 trillion times the mass of the Sun, respectively. Both of the two largest galaxies at the center of this image are part of MCS J0358.8-2955; the smaller galaxies you see here, however, are a mixture of the two groups within Abell 3192.

Text credit: European Space Agency

Media Contact:

Claire Andreoli
NASA’s Goddard Space Flight Center, Greenbelt, MD
claire.andreoli@nasa.gov

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Dec 01, 2023
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