Early results from GLASS-JWST XVI: Discovering a bluer z~4-7 Universe through UV slopes

Understand

We use the GLASS-JWST Early Release Science NIRCam parallel observations to provide a first view of the UV continuum properties of NIRCam/F444W selected galaxies at 4<z<7.

• By combining multiwavelength NIRCam observations, we constrain the UV continuum slope for a sample of 401 galaxies with stringent quality controls.
• We find that >99% of the galaxies are blue star-forming galaxies with very low levels of dust (Avbeta~0.01+/-0.33).
• We find no statistically significant correlation for UV slope with redshift or UV magnitude.