Kavli Affiliate: Roberto Maiolino
| First 5 Authors: Jakob M. Helton, George H. Rieke, Stacey Alberts, Zihao Wu, Daniel J. Eisenstein
| Summary:
The James Webb Space Telescope (JWST) has spectroscopically confirmed
numerous galaxies at $z > 10$. While weak rest-ultraviolet emission lines have
only been seen in a handful of sources, the stronger rest-optical emission
lines are highly diagnostic and accessible at mid-infrared wavelengths with the
Mid-Infrared Instrument (MIRI) of JWST. We report the photometric detection of
the distant spectroscopically confirmed galaxy JADES-GS-z14-0 at $z =
14.32^{+0.08}_{-0.20}$ with MIRI at $7.7 mumathrm{m}$. The most plausible
solution for the stellar population properties is that this galaxy contains
half a billion solar masses in stars with a strong burst of star formation in
the most recent few million years. For this model, at least one-third of the
flux at $7.7 mumathrm{m}$ comes from the rest-optical emission lines
$mathrm{H}beta$ and/or $mathrm{[OIII]}lambdalambda4959,5007$. The inferred
properties of JADES-GS-z14-0 suggest rapid mass assembly and metal enrichment
during the earliest phases of galaxy formation. This work demonstrates the
unique power of mid-infrared observations in understanding galaxies at the
redshift frontier.
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