Space Breaking News:

Galaxy Clusters Abell S1063 and MACS J0416.1-2403 Release Date: Dec 20, 2018 Credits: NASA, ESA, and M. Montes (University of New South Wales)

Galaxy Clusters Abell S1063 and MACS J0416.1-2403

Galaxy Clusters Abell S1063 and MACS J0416.1-2403

Two massive galaxy clusters — Abell S1063 (left) and MACS J0416.1-2403 (right) — display a soft blue haze, called intracluster light, embedded among innumerable galaxies. The intracluster light is produced by orphan stars that no longer belong to any single galaxy, having been thrown loose during a violent galaxy interaction, and now drift freely throughout the cluster of galaxies. Astronomers have found that intracluster light closely matches with a map of mass distribution in the cluster’s overall gravitational field. This makes the blue “ghost light” a good indicator of how invisible dark matter is distributed in the cluster. Dark matter is a key missing link in our understanding of the structure and evolution of the universe. Abell S1063 and MACS J0416.1-2403 were the strongest examples of intracluster light providing a much better match to the cluster’s mass map than X-ray light, which has been used in the past to trace dark matter.

Credits: NASA, ESA, and M. Montes (University of New South Wales)
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