Seven wonders of Cosmic Dawn: JWST confirms a high abundance of galaxies and AGNs at z $\simeq$ 9-11 in the GLASS field

Understand

We present JWST/NIRSpec PRISM follow-up of candidate galaxies at z=9-11 selected from deep JWST/NIRCam photometry in GLASS-JWST Early Release Science data.

• We spectroscopically confirm six sources with secure redshifts at z = 9.52-10.43, each showing multiple emission lines.
• An additional object is likely at z = 10.66, based on its Lya-break and a single emission feature, while one source is a lower redshift interloper.
• The sample includes the first JWST-detected candidate at z=10, GHZ1/GLASS-z10, which we confirm at z = 9.875, and the X-ray detected AGN GHZ9 confirmed at z = 10.145.