File:Calibration method used to achieve the highest-resolution image with ALMA (ann23019b).jpg

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In new observations that pushed ALMA capabilities to the extreme, researchers had to develop a new calibration method to obtain the highest-resolution ever image with ALMA.

Summary

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Description
English: In new observations that pushed ALMA capabilities to the extreme, researchers had to develop a new calibration method to obtain the highest-resolution ever image with ALMA. In this so-called band-to-band method, atmospheric fluctuations are compensated for by observing a nearby calibrator in low-frequency radio waves, while the target is observed with high-frequency radio waves. The top right inset image shows the ALMA image of R Leporis that achieved the highest resolution of 5 milli-arcseconds. Submillimeter-wave emission from the stellar surface is shown in orange and hydrogen cyanide maser emissions at 891 GHz are shown in blue. The top left inset image shows a previous observation of the same star using a different array configuration with less distance between the antennas and without the band-to-band method, resulting in a resolution of 75 milli-arcsec. The previous resolution is too coarse to specify the positions of each of the two emission components.
Date 15 November 2023 (upload date)
Source
This media was produced by the European Southern Observatory (ESO), under the identifier ann23019b

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Author ALMA (ESO/NAOJ/NRAO)/Y. Asaki et al.
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