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Measurements of the UV-continuum slopes provide valuable information on thephysical properties of galaxies forming in the early universe, probing the dustreddening, age, metal content, and even the escape fraction. While constraintson these slopes generally become more challenging at higher redshifts as the UVcontinuum shifts out of the Hubble Space Telescope bands (particularly at z>7),such a characterisation actually becomes abruptly easier for galaxies in theredshift window z=9.5-10.5 due to the Spitzer/IRAC 3.6um-band probing therest-UV continuum and the long wavelength baseline between this Spitzer bandand the Hubble H-band. Higher S/N constraints on the UV slope are possible atz~10 than at z=8. Here we take advantage of this opportunity and five recentlydiscovered bright z=9.5-10.5 galaxies to present the first measurements of themean slope for a multi-object sample of galaxy candidates at z~10. We find themeasured observed slopes of these candidates are $-2.1\pm0.3\pm0.2$ (random andsystematic), only slightly bluer than the measured slopes at 3.5<z<7.5 forgalaxies of similar luminosities. Small increases in the stellar ages,metallicities, and dust content of the galaxy population from z~10 to z~7 couldeasily explain the apparent evolution in slopes.

Quantifying the UV continuum slopes of galaxies to z~10 using deep Hubble and Spitzer/IRAC observations