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Sneaky pete baryons in gravitational lensing

21 Aug 2017, 12:00 UTC
Sneaky pete baryons in gravitational lensing
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Title: Flux-ratio anomalies from discs and other baryonic structures in the Illustris simulationAuthors: Jen-Wei Hsueh, Giulia Despali, Simona Vegetti et al.First Author’s Institution: University of California, DavisStatus: Submitted to MNRAS, open accessWhen a photon perilously escapes being engulfed by gases in its galaxy, it embarks on a long journey to reach our telescopes. Along the way, the combined gravitational field of nearby galaxies and galaxy clusters lures the photon away from sticking to a straight path. Occasionally, its path gets very bent when it passes very close to a galaxy, so much so that when the photon reaches our telescope, we see multiple images of the galaxy where the photon originates. This phenomenon of light bending due to the gravity of matter is known as gravitational lensing.
As you gaze at the Sun later today during the solar eclipse, remember Albert Einstein, Sir Arthur Eddington, and gravitational lensing. Nearly a century ago on May 29, 1919 when the Sun was completely eclipsed by the Moon, on the west coast of Africa and Brazil, Sir Arthur Eddington and his team proved Einstein’s theory of general relativity. On the day of the eclipse, the Sun was destined to pass by the Hyades ...

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