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We present the results of a study investigating the rest-frame ultra-violet(UV) spectral slopes of redshift z~5 Lyman-break galaxies (LBGs). By combiningdeep Hubble Space Telescope imaging of the CANDELS and HUDF fields withground-based imaging from the UKIDSS Ultra Deep Survey (UDS), we have produceda large sample of z~5 LBGs spanning an unprecedented factor of >100 in UVluminosity. Based on this sample we find a clear colour-magnitude relation(CMR) at z~5, such that the rest-frame UV slopes (beta) of brighter galaxiesare notably redder than their fainter counterparts. We determine that the z~5CMR is well described by a linear relationship of the form: d beta = (-0.12 +/-0.02) d Muv, with no clear evidence for a change in CMR slope at faintmagnitudes (i.e. Muv > -18.9). Using the results of detailed simulations we areable, for the first time, to infer the intrinsic (i.e. free from noise)variation of galaxy colours around the CMR at z~5. We find significant (12sigma) evidence for intrinsic colour variation in the sample as a whole. Ourresults also demonstrate that the width of the intrinsic UV slope distributionof z~5 galaxies increases from Delta(beta)=0.1 at Muv=-18 to Delta(beta)=0.4 atMuv=-21. We suggest that the increasing width of the intrinsic galaxy colourdistribution and the CMR itself are both plausibly explained by a luminosityindependent lower limit of beta=-2.1, combined with an increase in the fractionof red galaxies in brighter UV-luminosity bins.

The colour distribution of galaxies at redshift five