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Spectroscopic confirmation of a massive quiescent galaxy, at z = 4.658, just 1.25 Gyr after the Big Bang,
They used deep continuum observations from JWST NIRSpec
It formed its stellar population over a 200 Myr period, approximately 600 − 800 Myr after the Big Bang (z = 7.3 ± 0.2), before quenching at z = 6.7 ± 0.3

Redshift estimates:

GalevJC > 2023/05/29 > A massive quiescent galaxy at redshift 4.658 > Screenshot 2023-05-30 at 11.53.47.png

JWST NIRSpec observations of GS-9209 for a z~4.658 galaxy:

GalevJC > 2023/05/29 > A massive quiescent galaxy at redshift 4.658 > Screenshot 2023-05-30 at 11.53.57.png