Early results from GLASS-JWST. X: Rest-frame UV-optical properties of galaxies at 7 < z < 9

Understand

We present the first James Webb Space Telescope/NIRCam-led determination of $7<z<9$ galaxy properties based on broadband imaging from 0.8 to 5~$\mathrm{\mu m}$ as part of the GLASS-JWST Early Release Science program.

• This is the deepest dataset acquired at these wavelengths to date, with an angular resolution $\lesssim0.14$ arcsec.
• We robustly identify 13 galaxies with $S/N\gtrsim8$ in F444W from 8 arcmin$^2$ of data at $m_{AB}\leq 28$ from a combination of dropout and photometric redshift selection.
• From simulated data modeling, we estimate the dropout sample purity to be $\gtrsim90\%$.