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We introduce a method for constructing end-to-end mock galaxy cataloguesusing a semi-analytical model of galaxy formation, applied to the halo mergertrees extracted from a cosmological N-body simulation. The mocks that weconstruct are lightcone catalogues, in which a galaxy is placed according tothe epoch at which it first enters the past lightcone of the observer, andincorporate the evolution of galaxy properties with cosmic time. We determinethe position between the snapshot outputs at which a galaxy enters theobserver's lightcone by interpolation. As an application, we consider theeffectiveness of the BzK colour selection technique, which was designed toisolate galaxies in the redshift interval 1.4<z<2.5. The mock catalogue is inreasonable agreement with the observed number counts of all BzK galaxies, aswell as with the observed counts of the subsample of BzKs that are star-forminggalaxies. We predict that over 75 per cent of the model galaxies withK_{AB}<=23, and 1.4<z<2.5, are selected by the BzK technique. Interlopergalaxies, outside the intended redshift range, are predicted to dominate brightsamples of BzK galaxies (i.e. with K_{AB}<=21). Fainter K-band cuts arenecessary to reduce the predicted interloper fraction. We also show thatshallow B-band photometry can lead to confusion in classifying BzK galaxies asbeing star-forming or passively evolving. Overall, we conclude that the BzKcolour selection technique is capable of providing a sample of galaxies that isrepresentative of the 1.4<z<2.5 galaxy population.

Lightcone mock catalogues from semi-analytic models of galaxy formation - I. Construction and application to the BzK colour selection