Cluster galaxies and green peas
A new analysis of distant galaxies imaged by the James Webb Space Telescope has shown
Very small galaxies, they share some notable similarities with a “green pea,” a small dot in space that has a distinct green shade. A larger-than-normal portion of their light is from hot gas, which emits light in discrete colors rather than a continuous spectrum of rainbow colors. They are a rare class of galaxies. Small galaxies in our cosmic backyard
The early peas were found in the James Webb Space Telescope's sharpest deep-infrared image of the distant universe seen to date, which imaged thousands of galaxies in and behind a cluster known as SMACS 0723. The cluster's mass makes it gravitational lens magnify and distort the appearance of the background galaxies astronomers focused on. On three faint, compact infrared objects whose properties resemble green peas, the detailed chemical signatures of these early galaxies show that they include what may be the most primitive galaxies yet identified, with only 2% of the oxygen content of a galaxy like ours. It allows astronomers to link these galaxies from the dawn of the universe to similar galaxies nearby
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