The precise location of megamaser emission regions in galactic accretion disks has been challenging to pinpoint. Now with interferometric observations leveraging baselines larger than the Earth’s diameter, the missing information is getting closer and closer.
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Impellizzeri, C.M.V. The super-resolved megamasers of NGC 4258. Nat Astron 6, 885–886 (2022). https://doi.org/10.1038/s41550-022-01764-2