Les galaxies commencent à « mourir » lorsqu'elles cessent de former des étoiles, mais jusqu'à présent, les astronomes n'avaient jamais clairement entrevu le début de ce processus dans une galaxie lointaine. Grâce à ALMA (Atacama Large Millimeter/submillimeter Array), dont l'Observatoire Européen Austral (ESO) est partenaire, les astronomes ont vu une galaxie éjecter près de la moitié de son gaz nécessaire à la formation d'étoiles. Cette éjection se produit à un rythme effarant, qui équivaudrait à 10 000 fois la masse du soleil de gaz par an - la galaxie perd rapidement son combustible pour fabriquer de nouvelles étoiles. L'équipe pense que cet événement spectaculaire a été déclenché par une collision avec une autre galaxie, ce qui pourrait amener les astronomes à repenser la façon dont les galaxies cessent de donner vie à de nouvelles étoiles.
Le communiqué, les images et les vidéos sont disponibles sur :
https://www.eso.org/public/france/news/eso2101/
Amicalement,
The ESO Department of Communication
11 janvier 2021
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