A quasar has taken part in the gravitational lensing of a background galaxy into an Einstein ring, which enables a remarkable measurement of the host galaxy lensing mass.
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Taak, Y.C. A new lens for quasar host masses. Nat Astron 7, 888–889 (2023). https://doi.org/10.1038/s41550-023-02020-x
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DOI: https://doi.org/10.1038/s41550-023-02020-x
