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A chart of hourly posts over the last week (for big screens). A chart of hourly posts over the last week (for small screens).

From arxiv.org

J1721+8842: The first Einstein zig-zag lens

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We report the discovery of the first example of an Einstein zig-zag lens, an extremely rare lensing configuration. In this system, J1721+8842, six images of the same background quasar are formed by two intervening galaxies, one at redshift $z_1 = 0.184$ and a second one at $z_2 = 1.885$. Two out...

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on Nov 8

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