Evidence that early galaxies may be bigger and more complex than previously thought AAS_Publishing
This artist’s conception illustrates the previously unknown complexity of the young galaxy, A1689-zD1. Reaching far beyond the center of the galaxy, shown here in pink, is an abundant halo of cold carbon gas. For scientists, this uncommon feature indicates that the galaxy may be much larger than previously believed and that early stages of normal galaxy formation may have been more active and dynamic than theorized.
"A1689-zD1 is located in the very early universe—only 700 million years after the Big Bang. This is the era where galaxies were just beginning to form," said Hollis Akins, an undergraduate student in astronomy at Grinnell College and the lead author of the research."What we're seeing in these new observations is evidence of processes that may contribute to the evolution of what we call normal galaxies as opposed to massive galaxies.
According to Akins, this is unusual for early galaxies."The carbon gas we observed in this galaxy is typically found in the same regions as neutral hydrogen gas, which is also where new stars tend to form. If that is the case with A1689-zD1, the galaxy is likely much larger than previously thought.
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