Half light radius of high redshift galaxy11/14/2023 This could be important, since RX J2129-z95 exists near the end of the "cosmic dark ages," when radiation ionized most of the vast ocean of neutral hydrogen gas that filled the universe. Williams' team also found no evidence for an active supermassive black hole at the center of RX J2129-z95. The fact that all these early galaxies are small, despite their high luminosity, favors the popular model of hierarchical galaxy formation, which predicts that small galaxies formed first, before merging and growing into larger galaxies such as the Milky Way. "This means that a ton of star formation is packed into a very tiny volume." "The star-formation rate is similar to other high-redshift galaxies confirmed with NIRSPec, but the radius of the galaxy is at least three times smaller than those other galaxies," said Hayley Williams, a PhD student at the University of Minnesota who led the research, in an interview with. JWST is finding that such high star-formation rates are a fairly typical trait of galaxies in the early universe, but RX J2129-z95 is extreme even as far as high-redshift galaxies go. Yet despite having a volume a thousand times less than the Milky Way, RX J2129-z95's rate of star formation is the same as our galaxy's, meaning it is much more intense. For example, RX J2129-z95 is just 105.6 light-years across, which is tiny compared to the 100,000 light-year-diameter of our Milky Way galaxy or even modern dwarf galaxies that span several thousand light years.
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