James Webb Space Telescope Spots Early Galaxies Feeding on Cold Gas
Arthur T Knackerbracket has processed the following story:
Researchers looking at data from the James Webb Space Telescope have gained new insight on galaxies forming during an earlier period of the universe.
These three galaxies are believed to be actively forming when the universe was only 400m to 600m years old - compared to the universe's current estimated age of roughly 13.7bn years. Thanks to Webb's powerful instruments, researchers can peer into this early period and learn more about how the universe was formed.
Webb's data on this early period shows these three galaxies are surrounded by gases. The researchers suspect these gases are almost purely hydrogen and helium, the earliest elements to exist in the cosmos.
[...] We're moving away from a picture of galaxies as isolated ecosystems," Nielsen said. At this stage in the history of the universe, galaxies are all intimately connected to the intergalactic medium with its filaments and structures of pristine gas."
[...] By combining spectra with Webb images, the team found that the light from these three forming galaxies is being absorbed by large amounts of neutral hydrogen gas.
The gas must be very widespread and cover a very large fraction of the galaxy," said study co-author and associate professor Darach Watson. This suggests that we are seeing the assembly of neutral hydrogen gas into galaxies. That gas will go on to cool, clump, and form new stars."
By matching James Webb's data to existing models of star formation, the researchers also found that these galaxies primarily have populations of young stars, suggesting these galaxies have not had enough time to form most of their stars yet.
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