Calibration method used to achieve the highest-resolution image with ALMA

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.


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

O zdjęciu

Typ:Wizja artysty
Data publikacji:15 listopada 2023 07:00
Powiązane ogłoszenia:ann23019
Rozmiar:3004 x 2254 px

O obiekcie

Nazwa:Atacama Large Millimeter/submillimeter Array
Typ:Unspecified : Technology : Observatory : Telescope

Formaty zdjęć

Wielki JPEG
665,4 KB



161,9 KB
230,9 KB
291,6 KB
331,1 KB
402,3 KB