Kavli Affiliate: Roberto Maiolino
| First 5 Authors: William M. Baker, Sandro Tacchella, Benjamin D. Johnson, Erica Nelson, Katherine A. Suess
| Summary:
The physical processes that establish the morphological evolution and the
structural diversity of galaxies are key unknowns in extragalactic
astrophysics. Here we report the finding of the morphologically-mature galaxy
JADES-GS+53.18343-27.79097, which existed within the first 700 million years of
the Universe’s history. This star-forming galaxy with a stellar mass of 400
million solar masses consists of three components, a highly-compact core with a
half-light radius of less than 100 pc, an actively star-forming disc with a
radius of about 400 pc, and a star-forming clump, which all show distinctive
star-formation histories. The central stellar mass density of this galaxy is
within a factor of two of the most massive present-day ellipticals, while being
globally 1000 times less massive. The radial profile of the specific
star-formation rate is rising toward the outskirts. This evidence suggests the
first detection of inside-out growth of a galaxy as a proto-bulge and a
star-forming disc in the Epoch of Reionization.
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