Colour predictions for starbursts and QSOs

Colour predictions including the effects of intergalactic attenuation for a 600 Myr starburst (solid lines), a 3 Myr starburst (long-dashed lines), a Type I QSO (dot-dashed lines) and a Type II QSO with high equivalent width emission lines (dotted lines). In the third and fifth rows, the B, V, i, z, J and H magnitudes refer to the HST B₄₃₅, V₆₀₆, i₇₇₅, z₈₅₀, J₁₁₀ and H₁₆₀ bands, respectively. The fourth row magnitudes refer to the UKIDSS ZYJHK bands.