![Galaxy Cluster Abell 3192](https://scitechdaily.com/images/Galaxy-Cluster-Abell-3192-777x709.jpg)
This Hubble Space Telescope image features the galaxy cluster Abell 3192 in the constellation Eridanus. Initially thought to be a single cluster, further research revealed it comprises two separate galaxy clusters, with one closer at 2.3 billion light-years and another more distant at 5.4 billion light-years. The more distant cluster, MCS J0358.8-2955, is central in the image. These clusters, rich in mass and enveloped in dark matter, create a gravitational lens effect, distorting the appearance of smaller galaxies behind them. Credit: ESA/Hubble & NASA, G. Smith, H. Ebeling, D. Coe
Abell 3192, captured by Hubble, is a complex of two galaxy clusters in Eridanus, exhibiting a gravitational lens effect due to their immense mass.
This Hubble Picture of the Week 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 located 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, a 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 actually comprised two independent galaxy clusters — a foreground group around 2.3 billion light-years from Earth, and a further group at a 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.
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