New images from the James Webb Space Telescope have allowed astronomers to study star formation inside distant galaxies for the first time

Thanks to the James Webb Space Telescope’s first images of galaxy clusters, researchers have been able to examine very compact structures of star clusters inside galaxies, so-called ‘clumps’.

In a paper published in the Monthly Notices of the Royal Astronomical Society, astronomers from Stockholm University have studied the first phase of star formation in distant galaxies.

See also: Early universe imagery shows merging galaxies

background galaxies

One of the lead authors of the paper, Adélaïde Claeyssens of the Department of Astronomy, Stockholm University, said: “The galaxy clusters we examined are so massive that they bend light rays passing through their centre, as predicted by Einstein in 1915.

“And this in turn produces a kind of magnifying glass effect: the images of background galaxies are magnified.”

The magnifying glass effect together with the resolution of the James Webb Space Telescope made it possible for the researchers to detect stellar clumps; very compact galaxy structures.

These observations allowed the researchers to study the link between clump formation and evolution and galaxy growth a few million years after the Big Bang, and in a way that has not been possible before.

game changer

Another of the lead authors of the paper, Angela Adamo of the Oscar Klein Centre at Stockholm University, added: “The images from the James Webb Space Telescope show that we can now detect very small structures inside very distant galaxies and that we can see these clumps in many of these galaxies.

“The telescope is a game changer for the entire field of research and helps us understand how galaxies form and evolve.”

The oldest galaxy studied in the paper is so far away that astronomers see what it looked like 13 billion years ago, when the universe was only 680 million years old.

The study ‘Star formation at the smallest scales; A JWST study of the clump populations in SMACS0723’ is published in the journal Monthly Notices of the Royal Astronomical Society.

Image: The James Webb Space Telescope captured this image of a galaxy cluster (SMACS0723). The five zoomed-in galaxies are so far away that we observe them as they were when the universe was between one and five billion years old. Today the universe is 13.7 billion years old. Credit: Image adapted from image released by NASA, ESA, CSA, STScI.