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Galaxy clusters Abell 2744 - Black material - X - rays, dark matter and galaxies...
IMAGE
number
PIX4565787
Image title
Galaxy clusters Abell 2744 - Black material - X - rays, dark matter and galaxies in cluster Abell 2744
This image of the galaxy cluster Abell 2744 is located in the constellation of the Sculptor, combines images obtained in visible view by the Hubble space telescope (HST) and the Very Large Telescope (VLT), an X-ray image obtained by the space telescope Chandra and a mathematical reconstruction of black matter. Visible galaxies represent only 5% of the total mass of the cluster. The hot gas present in the cluster (here in pink) appears in X-ray. The black material, which represents 75% of the total mass of the cluster, appears here in blue. This image combines visible light exposures of galaxy cluster Abell 2744 taken by the NASA/ESA Hubble Space Telescope and the European Southern Observatory's Very Large Telescope, with X - ray data from NASA's Chandra X - ray Observatory and a mathematical reconstruction of the location of dark matter. The galaxies in the cluster, while they are the only part that is visible in the optical part of the spectrum, actually only provide around 5% of the mass in the cluster. Hot intracluster gas (shown in pink) is visible through its X - ray emissions, observed by Nasa's Chandra satellite. The blue overlay shows a map of the mass in the cluster. This is reconstructed based on detailed analysis of the way that the cluster bends light from galaxies in the distant background. Evidence of this light bending can be seen in arc - like distortions in parts of this image. Since dark matter makes up the lion's share of mass in the cluster - - around 75% - - this blue overlay reveals the location of the otherwise invisible dark matter. Analysis of this data has allowed scientists to observe some strange phenomena in Abell 2744, including a pocket of dark matter with no gas or galaxies, and a clump of galaxies with no associated gas. Astronomers believe that Abell 2744 formed from the simultaneous pile - up of at least four separate cluster
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