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The Fault in Our (Unaligned) Stars

21 Jul 2020, 16:00 UTC
The Fault in Our (Unaligned) Stars
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Editor’s note: Astrobites is a graduate-student-run organization that digests astrophysical literature for undergraduate students. As part of the partnership between the AAS and astrobites, we occasionally repost astrobites content here at AAS Nova. We hope you enjoy this post from astrobites; the original can be viewed at astrobites.org.
Title: Geometric Support for Dark Matter by an Unaligned Einstein Ring in Abell 3827
Authors: M. Chen, T. Broadhurst, J. Lim, et al.
First Author’s Institution: The University of Chicago
Status: Accepted to ApJ
Perhaps the greatest and most pressing problem in modern astrophysics is the problem of dark matter. Dark matter is a purported physical substance that emits no electromagnetic radiation and appears to interact only with ordinary matter and itself through gravity. The existence of dark matter is hypothesized in order to explain numerous key observations throughout the universe, most notably:

Galaxy rotation speeds (e.g., Vera Rubin’s work on the velocity of stars in the Milky Way)
Galaxy cluster dynamics (e.g., the Bullet Cluster, “a smoking gun for dark matter”)
Gravitational lensing by galaxies & galaxy clusters
Baryon acoustic oscillations
Anisotropies (deviations from uniformity) in the cosmic microwave background

Unfortunately, despite more than a decade of searching, there has yet ...

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