Clouds of Carbon Dust Seen When the Universe was Less Than a Billion Years Old universetoday storybywill
“Dust grains catalyze the formation of molecules and the fragmentation of gas clouds, two mechanisms that are essential to star formation. Furthermore, while the dust mass of a galaxy is negligible compared to its stellar or gas mass, dust grains absorb a significant fraction of the optical and ultraviolet light and thermally re-emit the absorbed energy in the infrared .”
An international team of astronomers has used data from the JWST to report the discovery of the earliest galaxies confirmed to date . Credit: NASA/ESA/CSA Based on the data obtained from these fields, the team observed direct evidence of carbonaceous grains that existed up to one billion years after the Big Bang . This was evident from the broad UV absorption feature in the deep near-infrared spectra . This feature had previously been observed only in older galaxies at redshifts of=< 3 . These grains were previously believed to be produced by Red Giant stars over the course of hundreds of millions of years.
“Most dust formation models typically rely on carbonaceous dust grains being formed in the stellar winds of stars, while stars can only reach this evolutionary stage ~300 million years after they form.
These results imply that a more rapid mechanism was responsible for forming carbonaceous dust grains in the early Universe. As Witstok explained, he and his colleagues suspect that supernovae seeded the early Universe with carbon as they blew off their outer layers.
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