Science, Space and Technology News 2024
Utilizing data from NASA’s James Webb Space Telescope, scientists have unveiled the earliest starlight spectra, revealing low-mass galaxies’ central role in the universe’s dawn. Credit: SciTechDaily.com
Deep field images from NASA’s James Webb Space Telescope provided the first glimpses of ultra-faint galaxies that researchers identified as strong candidates for the objects that sparked the reionization of the universe. Credit: Hakim Atek/Sorbonne University/JWSTNormal matter in the universe started as a hot, dense fog made almost entirely of hydrogen and helium nuclei, explained Joel Leja, assistant professor of astronomy and astrophysics at Penn State and author on the paper.
“If the other low-mass galaxies in the universe are as common and energetic as these, we think we finally understand the lighthouses that burned off the cosmic fog,” Leja said. “They were incredibly energetic stars in many, many tiny little galaxies.” “We found that small galaxies outnumbered massive galaxies by about a hundred to one during this epoch of reionization of the universe,” Hakim Atek, astrophysicist at Sorbonne University, researcher at the Paris Astrophysics Institute and first author on the paper said in a release. “These novel observations also reveal that these small galaxies produced a considerable amount of ionizing photons, exceeding by four times the canonical values usually assumed for distant galaxies.
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