Hubble Captures Stunning View of Merging Galaxy Clusters

This NASA Hubble Space Telescope image showcases CL0016+1609 or MACS J0018.5+1626, a galaxy cluster that shines brightly in X-rays and represents one of the most extensively studied clusters at both X-ray and radio wavelengths. X-ray observations of this cluster revealed it consists of two distinct clusters merging along our line of sight.

Researchers secured Hubble observing time to study CL0016+1609 because the resulting data would enable precise measurements of the cluster’s dark matter distribution. This information is crucial for understanding the merger dynamics and the cluster’s role in the universe’s large-scale structure. While Hubble cannot directly observe dark matter, its infrared and visible light capabilities detect the gravitational lensing effects of dark matter on normal matter that Hubble can see.

The Hubble data also includes observations from the Wide Field Camera 3, part of the RELICS (Reionization Lensing Cluster Survey) program. RELICS obtained the first Hubble infrared images of 46 massive galaxy clusters and identified approximately 300 high-redshift candidate galaxies gravitationally lensed by these clusters.

In the image, look for the faint vertical arc of a distant galaxy just to the left of the large elliptical galaxies at the center. A brighter, shorter arc is also visible above and to the right of the central galaxies.

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