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A core in a star-forming disc as evidence of inside-out growth in the early Universe

Chevallard, Jacopo; Maseda, Michael V.; Carniani, Stefano +36 more

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 w…

Photometric detection at 7.7 µm of a galaxy beyond redshift 14 with JWST/MIRI

Pérez-González, Pablo G.; Charlot, Stéphane; Chevallard, Jacopo +31 more

The James Webb Space Telescope (JWST) has spectroscopically confirmed numerous galaxies at z > 10. While weak rest-frame ultraviolet emission lines have only been seen in a handful of sources, the stronger rest-frame optical emission lines are highly diagnostic and accessible at mid-infrared wavelengths with the Mid-Infrared Instrument (MIRI) o…

The formation and survival of the Milky Way's oldest stellar disk

Xiang, Maosheng; Huang, Yang; Liu, Jifeng +3 more

It remains a mystery when our Milky Way first formed a stellar disk component that survived and maintained its disk structure from subsequent galaxy mergers. We present a study of the age-dependent structure and star formation rate of the Milky Way's disk using high-α stars with substantial orbital angular momentum that have precise age determinat…