Scientists have used data from the James Webb Space Telescope (JWST) as part of the Cosmic Evolution Early Release Science (CEERS) Survey to change the way we think about the universe and its distant galaxies. Astronomers authored a paper confirming very bright galaxies in the early universe, while also disproving the identification of what would have been the most distant galaxy ever found.
Rochester Institute of Technology scientists have once again used data from the James Webb Space Telescope as part of the Cosmic Evolution Early Release Science Survey to change the way we think about the universe and its distant galaxies.
Kartaltepe and Larson, along with co-authors from around the world, studied the redshift of several specific galaxies to see how much the light shifted, which indicates how far away the galaxies are. The CEERS team focused on Maisie's Galaxy, which was theorized to have a redshift of z ≈ 11.5, while a team in Scotland researched a nearby galaxy that they believed could have a redshift of z ≈ 16, far larger than any ever found before.
"Spectra are how you really confirm what a galaxy's redshift is," explained Kartaltepe."For these two galaxies, the answer was very clear -- the spectra look completely different. We confirmed that Maisie's Galaxy is at the high redshift we thought it was." "Not only did JWST find these galaxies we didn't know about before, but then it confirmed the redshift for them," said Larson."This paper in particular speaks to the power of not only JWST finding galaxies in the really early universe but also confirming and characterizing them."
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